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Modern sealing products for renovating old buildings to improve energy efficiency

Multi-functional sealing tapes

ISO-BLOCO RENO
Renovation system for 3-layer sealing (U-shaped recess)

ISO-BLOCO HYBRATEC
Multi-functional tape with hybrid technology, resistant to driving rain to more than 1050 Pa

ISO-BLOCO ONE
Multi-functional tape for 3-layer sealing

ISO-BLOCO MULTI-FUNCTIONAL TAPE
ISO-BLOCO MULTI-FUNCTIONAL TAPE – The joint sealing tape offering massive time savings when fitting

ISO-BLOCO ONE CONTROL
The joint sealing tape with tear-off cover for practical pre-fitting

Window connection foils

ISO-CONNECT VARIO SD
Variable-humidity window connection foil for inside and outside

ISO-CONNECT VARIO XD
Extremely impermeable to driving rain, tear-resistant, variable-humidity window connection foil with long-lasting outdoor weathering resistance

ISO-CONNECT INSIDE & OUTSIDE CL
Extremely stretchy, tear-resistant and highly adhesive window connection foils

ISO-TOP FLEX-ADHESIVE HP
Permanently flexible single-component construction adhesive for bonding ISO-CONNECT foils

ISO-TOP BLUE PRIMER
Environmentally friendly primer for mineral and fibrous surfaces

ISO-TOP SPRAY PRIMER
Bonding agent for spray application

ISO-TOP FLEX-ADHESIVE SP
Flexible and elastic Single-component construction adhesive with good initial adhesive power

ISO-TOP FLEX-ADHESIVE XP
Permanently flexible single component adhesive and sealant with a wide adhesion spectrum

Roof sealing systems

ISO-TOP POWER-TAPE
Adhesive tape for the airtight bonding of roof underlays and vapour barrier membranes

ISO-TOP FLEX-TAPE
Highly adhesive tape for airtight bonding between foils and adjacent components

ISO-TOP EASYPRESS PRO
High-quality cartridge applicator press for adhesives and sealants

ISO-TOP FLEX-ADHESIVE PA
High-quality, flexible, self-adhesive sealing compound for airtight interior connections

Multi-functional sealing tapes / refurbishments

ISO-BLOCO RENO
Renovation system for 3-layer sealing (U-shaped recess)

ISO-TOP ACRYLSEAL F
Highly adhesive and flexible sealant for air tight internal sealing

ISO-TOP FACADE SEAL
Permanently elastic sealant for sealing external moving joints on buildings

Window connection foils

ISO-CONNECT VARIO SD
Variable-humidity window connection foil for inside and outside

ISO-CONNECT VARIO XD
Extremely impermeable to driving rain, tear-resistant, variable-humidity window connection foil with long-lasting outdoor weathering resistance

ISO-CONNECT INSIDE & OUTSIDE CL
Extremely stretchy, tear-resistant and highly adhesive window connection foils

ISO-CONNECT OUTSIDE EPDM
Elastomer sealing foil for the external sealing of window and door elements in facade constructions

ISO-TOP FLEX-ADHESIVE HP
Permanently flexible single-component construction adhesive for bonding ISO-CONNECT foils

ISO-TOP BLUE PRIMER
Environmentally friendly primer for mineral and fibrous surfaces

ISO-TOP SPRAY PRIMER
Bonding agent for spray application

ISO-TOP FLEX-ADHESIVE SP
Flexible and elastic Single-component construction adhesive with good initial adhesive power

ISO-TOP FLEX-ADHESIVE XP
Permanently flexible single component adhesive and sealant with a wide adhesion spectrum

Spray sealants / cords

ISO-TOP ACRYLSEAL F
Highly adhesive and flexible sealant for air tight internal sealing

ISO-TOP FACADE SEAL
Permanently elastic sealant for sealing external moving joints on buildings

ISO-ZELL PE- AND PUR-CORD
Round profile seals as plugging and backfill materials for joints and cavities

ISO-TOP EASYPRESS PRO
High-quality cartridge applicator press for adhesives and sealants

ISO-TOP PRESSFIX
Aluminium tube press with nylon union nut and rubber-coated handle for construction adhesives and sealants.

Decoupling tapes

ISO-ZELL PE-TAPE AND FIX-TAPE
Padded tape for sealing and insulation

Window sill / threshold sealings

ISO-CONNECT OUTSIDE EPDM
Elastomer sealing foil for the external sealing of window and door elements in facade constructions

ISO-CONNECT EPDM SEALING COLLAR AND SEALING CORNERS
Moulded EPDM sealing corners for various connection areas on buildings

ISO-CONNECT EPDM SEALING TRAY
EPDM sealing system for external, bottom door and window connections

ISO-CONNECT KSKSEAL
Self-adhesive sealing membrane for the external sealing of floor connections

ISO-TOP KSKSEAL PRIMER
For pre-treating substrates for ISO-CONNECT KSKSEAL sealing membranes

ISO-TOP BLUE PRIMER
Environmentally friendly primer for mineral and fibrous surfaces

ISO-TOP SPRAY PRIMER
Bonding agent for spray application

ISO-TOP FLEX-ADHESIVE XP
Permanently flexible single component adhesive and sealant with a wide adhesion spectrum

Window sill form

ISO-TOP WINDOW SILL FORMS
Insulating profiles to provide thermal insulation and a substructure for windowsills

ISO-TOP FACADE SEAL
Permanently elastic sealant for sealing external moving joints on buildings

ISO-TOP SPRAY PRIMER
Bonding agent for spray application

Pre-compressed joint sealing tapes

ISO-BLOCO 600 „PREMIUM EDITION“
Pre-compressed joint sealing tape with 600 Pa impermeability to driving rain

ISO-BLOCO 300 „PREMIUM EDITION“
Pre-compressed joint sealing tape with 300 Pa impermeability to driving rain

IN FRONT OF WALL INSTALLATION SYSTEM – ISO-TOP WINFRAMER „TYPE 1“
The in front of wall installation system with integrated thermally insulating core

IN FRONT OF WALL INSTALLATION SYSTEM – ISO‑TOP WINFRAMER „TYPE 3“
High load-bearing capacity and load transfer in one

Cavity filler / In front of the wall installation systems

IN FRONT OF WALL INSTALLATION SYSTEM – ISO-TOP WINFRAMER „TYPE 1“
The in front of wall installation system with integrated thermally insulating core

IN FRONT OF WALL INSTALLATION SYSTEM – ISO‑TOP WINFRAMER „TYPE 3“
High load-bearing capacity and load transfer in one

ISO-BLOCO FILLER
Multi-functional insulating and sealing system for windows in double-leaf wall structures

Joint sealing products

ISO-BLOCO XTHERM
Multi-functional sealing tape with Microtherm technology

ISO-BLOCO HF
Impregnated sealing tape for sealing against draughts, heat loss, dust and noise

ISO-TOP THERMFOAM „BLUE LINE”
Low isocyanate PUR expanding foam for a healthy living environment

ISO-TOP ELASTIFLEX
Highly elastic PUR spray foam - insulation level and sound reduction area

ISO-TOP GUN
Dispensing gun with non-stick coating for PUR spray foams and PUR spray cleaners

Renovation system for 3-layer sealing (U-shaped recess)
Product picture: ISO-BLOCO RENO

The ISO-BLOCO RENO 3-layer sealing system was specially developed for replacing windows to improve energy efficiency. The multi-functional renovating tape is used before the windows are fitted directly in the U-shaped recess (between the plaster layers and visible masonry) created by removing the older windows. It does not expand against the frame until the window is in position, thus providing a reliable, simple and time-efficient sealing method.

ISO-BLOCO RENO consists of 2 components. The core layer is made of high-quality plastic and forms the “fine layer”, since it guarantees an optimum basis for sealing the connection joint against the window profile, similar to the fine layer of plaster in a new building. At the same time, the cavities behind it are reliably sealed and insulated.

The second component is a pre-compressed multi-functional tape with an integrated foil membrane which expands slowly against the window profile and seals it reliably. To assist with fitting, the stable backing component of the sealing system is also self-adhesive.

ISO-BLOCO RENO can be combined with spray-on sealants and trim strips which are often used in old buildings to disguise connection joints. On the inside, the joints can be sealed with ISO-TOP ACRYLSEAL F, for example, while ISO-TOP SILICONE F/FT or an MS polymer can be used on the outside.

Multi-functional tape with hybrid technology, resistant to driving rain to more than 1050 Pa
Product picture: ISO-BLOCO HYBRATEC

Window replacement on timber beams (prefabricated timber construction / timber frame house building
If windows were installed directly on a smooth timber beam as the supporting surface, the ISO-BLOCO HYBRATEC multi-functional tape can be applied directly when the windows are replaced. This multi-functional 3-layer tape then expands against the frame after fitting. The slow expansion behaviour and large joint function area makes this MF-1 tested multi-functional joint sealing tape excellent for this type of renovation work.

In combination with ISO-BLOCO FILLER
In old 2-leaf brick constructions with small air cavities between the facing shell/brick leaf and supporting masonry, there is often no thermal insulation in the air cavity. During renovation work, a large amount of expanding foam is introduced to close off the air cavity around the window. With our ISO-BLOCO FILLER masonry filler, in such cases the cavity can be filled and a sealing tape can be provided for the external wall rebate. On the other side, it creates a sealing surface for a multi-functional tape such as ISO-BLOCO HYBRATEC. The ISO-BLOCO FILLER is quick and easy to apply in the air cavity, saving both time and money. Acrylate or silicone-based sealants are recommended for the final jointing work.

In combination with the ISO-TOP WINFRAMER „TYPE 3“ IN FRONT OF WALL INSTALLATION SYSTEM
Where there are larger air cavities in 2-leaf masonry with a brick facing, the ISO-TOP WINFRAMER „TYPE 3“ IN FRONT OF WALL INSTALLATION SYSTEM can be retrospectively bonded and screwed into the air cavity during renovation work. The system profiles then form both the substrate for sealing with the ISO-BLOCO HYBRATEC multi-functional tape and a supporting surface for mechanically fixing the window in the air cavity.

Multi-functional tape for 3-layer sealing
Product picture: ISO-BLOCO ONE

Window replacement on timber beams (prefabricated timber construction/timber frame house building
If windows were installed directly on a smooth timber beam as the supporting surface, the ISO-BLOCO ONE multi-functional tape can be applied directly when the windows are replaced. This multi-functional 3-layer tape then expands against the frame after fitting. The slow expansion behaviour and large joint function area make this MF-1 tested multi-functional joint sealing tape excellent for this type of renovation work as it seals all 3 required sealing levels in a single work step.

In combination with ISO-BLOCO FILLER
In old 2-leaf brick constructions with small airgaps between the facing shell/brick leaf and supporting masonry, there is often no thermal insulation in the air cavity. During renovation work, large amounts of expanding foam is introduced to close off the air cavity around the window. Our ISO-BLOCO FILLER masonry filler can be used in such cases both to fill the cavity and to provide a sealing tape for the external wall rebate. On the other side, it creates a sealing surface for a multi-functional tape such as ISO-BLOCO ONE. The ISO-BLOCO FILLER is quick and easy to apply in the air cavity, saving both time and money. Acrylate or silicone-based sealants are recommended for the final jointing work.

In combination with the ISO-TOP WINFRAMER „TYPE 3“ IN FRONT OF WALL INSTALLATION SYSTEM
Where there are larger air cavities in 2-leaf masonry with a brick facing, the ISO-TOP WINFRAMER „TYPE 3 IN FRONT OF WALL INSTALLATION SYSTEM can be retrospectively bonded and screwed into the air cavity during renovation work. The system profiles then form both the substrate for sealing with the ISO-BLOCO ONE multi-functional tape and a supporting surface for mechanically fixing the window in the air cavity.

ISO-BLOCO MULTI-FUNCTIONAL TAPE – The joint sealing tape offering massive time savings when fitting
Product picture: ISO-BLOCO MULTI-FUNCTIONAL TAPE

ISO-BLOCO MULTI-FUNCTIONAL TAPE is a versatile special joint sealing tape with excellent functionality. Seals window and door joints, making them air tight and impermeable to driving rain. At the same time, ISO-BLOCO MULTI-FUNCTIONAL TAPE offers very good thermal insulation properties over the entire installation depth.

The joint sealing tape with tear-off cover for practical pre-fitting
Product picture: ISO-BLOCO ONE CONTROL

For the first time, this pre-compressed multi-function joint sealing tape makes the convenient and controlled pre-fitting of a 3-level seal possible in a workshop environment. This is guaranteed by a sturdy tear-off cover which ensures that the tape itself remains compressed for as long as you require even after the roll itself has been opened. The expansion of the joint sealing tape is only activated after the windows have been fitted. There's no better way to work!

Variable-humidity window connection foil for inside and outside
Product picture: ISO-CONNECT VARIO SD

Sealing of the second sealing level beneath windowsills
The ISO-CONNECT VARIO SD window connection foil is equipped with a moisture-regulating functional mechanism which ensures a high drying-out effect in the window connection joint all year round.


The variable sd value allows the foil to be used to equal effect both inside and outside. Moisture is transported equally well from the joint to the outside and to the room side, no matter what the weather. The joint is able to dry out, regardless of the climate and time of year or whether the heating or air-conditioning is switched on.

The foils are both air tight (offering significant energy savings) and impermeable to driving rain to more than 1050 Pa, greatly protecting the building structure against the weather.
The surfaces beneath the aluminium windowsills installed on the outside are especially at risk due to water run-off and condensation. Large amounts of free water can build up here. Creating a second sealing level with ISO-CONNECT VARIO SD prevents the window breasts becoming saturated and avoids possible frost damage to plaster.

Extremely impermeable to driving rain, tear-resistant, variable-humidity window connection foil with long-lasting outdoor weathering resistance
Product picture: ISO-CONNECT VARIO XD

Sealing of the second sealing level beneath windowsills
ISO-CONNECT VARIO XD offers particularly high tear resistance and can remain exposed to UV for up to one year. With its excellent durability and long-lasting outdoor weathering resistance, this polymer fleece foil is an ideal and reliable seal for window and door elements in metal, window and facade constructions. With its particularly high mechanical strength the foil can be used, for example, during renovation work in the facade, on gable windows behind wood panelling and in the windowsill area.

The variable-humidity foil is equally suited to sealing internal and external joints – in outdoor applications as weather protection in excess of 1,050 Pa and, for indoor use, as an airtight layer to separate the room and outdoor climates. The foil is also very good for renovation work to improve energy efficiency.

The special foil reacts to different seasonal temperature gradients by variably adapting its sd value. The sharp vapour diffusion gradient creates a moisture-regulating functional mechanism which results in a high drying-out effect in the window connection joint all year round. Moisture trapped in the structure can escape in both directions, effectively preventing moisture damage and health risks from mould growth.

Extremely stretchy, tear-resistant and highly adhesive window connection foils
Product picture: ISO-CONNECT INSIDE CL

Change to the window level
With the ISO-CONNECT INSIDE & OUTSIDE CL window connection foils you can reliably seal connection joints in windows, doors and panels. In building renovation projects, the foils are excellent for application to old plaster surfaces, in particular. The foils are made from an adaptable soft polymer fleece which can easily be plastered, painted or bonded over.

Adhesion to the substrate is guaranteed by the maximized bonding power. Even significant component movements can be permanently compensated with these extremely stretchy yet highly tear-resistant window connection foils.

When adding an external wall insulation system to existing buildings, it is often sensible to move the window installation position outwards. This improves the solar gain, allows more sunlight into the interior, increases the living space and makes the building look more modern from the outside. The windows then sit flush with the outside of the external wall and can be sealed directly onto the old, cleaned plastered reveal using ISO-CONNECT OUTSIDE CL. The foil protects the connection joint, even if there is a long delay before the external wall insulation system is applied. It also keeps the joint dry and protects the thermal insulation against harmful UV radiation.

Permanently flexible single-component construction adhesive for bonding ISO-CONNECT foils
Product picture: ISO-TOP FLEX-ADHESIVE

Bonding connection foils and attaching trim strips
ISO-TOP FLEX-ADHESIVE HP is a high-quality, solvent-free and permanently flexible single-component construction adhesive based on MS polymer. MS polymers are especially suitable for bonding connection foils to uneven substrates of the type frequently encountered when renovating buildings. ISO-TOP FLEX-ADHESIVE HP can be used on almost all substrates. It is ideal for creating airtight and windtight connections that are also impermeable to driving rain when used in combination with ISO-CONNECT window connection foils and when bonding trim strips around the window.

Environmentally friendly primer for mineral and fibrous surfaces
Product picture: ISO-TOP BLUE PRIMER

Environmentally friendly primer for mineral and fibrous surfaces
Old surfaces in existing buildings generally need pre-treatment in the form of a primer to give new sealants a good bonding surface. Various primers are used for this purpose.

ISO-TOP BLUE PRIMER is a primer based on an aqueous acrylate polymer dispersion. It was specially developed to improve the adhesion properties of acrylate, bitumen, butyl and hybrid polymer adhesives, and of adhesive tapes on mineral surfaces. ISO-TOP BLUE PRIMER can also be used on fibrous surfaces such as soft fibreboard, wood materials, timber and other general construction materials.

Bonding agent for spray application
Product picture: ISO-TOP SPRAY PRIMER

Substrate pre-treatment for spray application
Old surfaces in existing buildings generally need pre-treatment in the form of a bonding agent to give new sealants a good bonding surface. Various primers are used for this purpose.

ISO-TOP SPRAY PRIMER is a bonding agent for spray application. It is based on synthetic rubber / resin. It was specially developed for preparing bonding surfaces for window connection foils, joint sealing tapes and multi-functional joint sealing tapes. The primer has outstanding initial adhesion and offers rapid bond formation. It is “ozone-friendly” and contains no chlorinated or fluorinated compounds.

When sealing in the bottom horizontal area, a good bonded joint often disturbs dust and impurities lying there. With the ISO-TOP SPRAY PRIMER, the last dust particles can be simply sprayed away after sweeping or vacuuming, preparing the surface ideally for the further work steps.

High-quality, flexible, self-adhesive sealing compound for airtight interior connections
Product picture: ISO-TOP FLEX-ADHESIVE

Sealing compound for airtight interior connections
ISO-TOP FLEX-ADHESIVE PA is a high-quality flexible and self-adhesive sealing compound for creating permanently airtight connections between ISO-CONNECT window connection foils and the interior of the structure. With its wide adhesion spectrum it can create a permanent and airtight connection between vapour retardant and vapour barrier foils, interliners, fleece, kraft paper, etc. and the masonry, plaster or wood. Thanks to its flexible and permanently tacky structure it is also ideal for creating butt joints and corners with the airtight ISO-BLOCO ONE multi-functional tape on the inside, and for system sealing in conjunction with the ISO-BLOCO RENO renovation multi-functional tape.

Flexible and elastic Single-component construction adhesive with good initial adhesive power
Product picture: ISO-TOP FLEX-ADHESIVE

Bonding connection foils and attaching wooden trim strips
ISO-TOP FLEX-ADHESIVE SP is a high-quality, flexible and elastic single-component construction adhesive with good initial adhesive power based on an acrylate dispersion. It is ideal for bonding ISO-CONNECT window connection foils to create interior connections that are airtight, wind-tight and impermeable to driving rain. It is also suitable, for example, for bonding wooden battens, jointing windowsills and backfilling cracks or dowel holes in interior walls.

Permanently flexible single component adhesive and sealant with a wide adhesion spectrum
Product picture: ISO-TOP FLEX-ADHESIVE

Bonding connection foils and sealing in conjunction with sealing foils
ISO-TOP FLEX-ADHESIVE XP is a high-quality, solvent-free and permanently flexible single-component construction sealant and adhesive based on MS polymer. With its wide adhesion spectrum it is ideal for creating airtight and windtight connections that are also impermeable to driving rain between ISO-CONNECT window connection foils and all standard substrates such as concrete, aerated concrete, rigid PVC, timber, metals and fibreglass. ISO-TOP FLEX-ADHESIVE XP is also suitable for sealing joint sealing tapes and multi-functional joint sealing tapes in corners and butt joints, plus many other construction applications. In the base area of floor-level components, ISO-TOP FLEX-ADHESIVE XP is used to bond EPDM sealing foils which protect the base area against non-pressurised water.

Adhesive tape for the airtight bonding of roof underlays and vapour barrier membranes
Product picture: ISO-TOP POWER-TAPE

Connection of vapour barrier foils in the roof or wall area in prefabricated timber constructions
The installation of new rooflights or other windows in the roof area requires the dormer to be connected to the roof’s vapour barrier foil. This connection to the vapour barrier can be correctly implemented with ISO-TOP POWER TAPE.

ISO-TOP POWER TAPE is a soda kraft paper with a highly adhesive acrylate emulsion adhesive on one side.

Highly adhesive tape for airtight bonding between foils and adjacent components
Product picture: ISO-TOP FLEX-TAPE

Connection of vapour barrier foils in the roof or wall area in prefabricated timber constructions
The installation of new rooflights or other windows in the roof area requires the dormer to be connected to the roof’s vapour barrier foil. This connection to the vapour barrier can be correctly implemented with ISO-TOP FLEX-TAPE.

ISO-TOP FLEX-TAPE is an LDPE foil equipped with a very strong special adhesive on one side.

High-quality cartridge applicator press for adhesives and sealants
Product picture: ISO-TOP EASYPRESS PRO

High-quality cartridge applicator press for adhesives and sealants
ISO-TOP EASYPRESS PRO is a high-quality, professional manual press for applying adhesives and sealants in 310 ml cartridges. The applicator press is equipped with a rotating barrel, strong pusher plate and rubber-coated handle.

Highly adhesive and flexible sealant for air tight internal sealing
Product picture: ISO-TOP ACRYLSEAL F

Sealing of interior connection joints
ISO-TOP ACRYLSEAL F is a high-quality, resilient and flexible single-component acrylate sealant based on an acrylate dispersion. The highly adhesive and flexible sealant is suitable for airtight internal sealing of structural joints.

ISO-TOP ACRYLSEAL F is also the right choice both for joint sealing and for disguising damage when windows are replaced. It can be easily applied in the joint and then blended onto existing surfaces. It is also easy to match the colour on the sealant surface using conventional interior wall paints. And as the joint sealant dries by giving off water, the drying effect is free from harmful solvents.

Permanently elastic sealant for sealing external moving joints on buildings
Product picture: ISO-TOP FACADE SEAL

Permanently reliable sealing of internal and external joints
ISO-TOP FACADE SEAL is an almost odourless spray-on hybrid sealant based on hybrid polymer. It is ideal for sealing moving joints on the outside of buildings owing to its colour-fastness and resistance to weathering and UV.


ISO-TOP FACADE SEAL adheres without primer even on slightly damp surfaces, cures blister-free and can be easily painted over using water-based paints.

ISO-TOP FACADE SEAL is easy to apply, whatever the weather. The sealant can even be applied to damp surfaces. It is expressly formulated for application in the rain; even at very low temperatures, ISO-TOP FACADE SEAL will not be damaged during application or drying.

Excellent adhesion to all standard substrates combined with simple and universal application make ISO-TOP FACADE SEAL ideal for use in the repair and renovation of existing buildings.

Elastomer sealing foil for the external sealing of window and door elements in facade constructions

Sealing against non-pressurised water & sealing in prefabricated buildings and solid construction as the second sealing level
ISO-CONNECT OUTSIDE EPDM is a weather-resistant sealing foil that can be used for the external sealing of window and door elements in facade constructions.

If patio doors or lift-and-slide elements are replaced during renovation work, the bottom connection which seals against standing water also needs to be replaced. This highly flexible elastomer sealing foil with its high mechanical strength is ideal for this task. In addition to its mechanical stability and tensile strength, the other outstanding characteristic of ISO-CONNECT OUTSIDE EPDM is its extreme flexibility and stretchability.

Round profile seals as plugging and backfill materials for joints and cavities
Product picture: ISO-ZELL PE- AND PUR-CORD

Round profile seals as plugging and backfill materials for spray-on joint sealants and cavities
ISO-ZELL PE AND PUR CORD is used in combination with joint sealants. This is as prescribed by the DIN 18540 standard and IVD datasheet no. 9. During renovation work, the connection joint is often filled with spray foam to provide good thermal insulation and soundproofing. After a few minutes, the slightly dried foam is pushed back with a PE cord sufficiently to make a grooved opening in which a sealant joint can be created. Backfill cords limit the filling depth and create the correct size of joint and a tapered shape. When used as a filling profile for sealing compounds, 3-flank adhesion is effectively avoided. ISO-ZELL PE AND PUR CORD can be used in both internal and external applications.

Aluminium tube press with nylon union nut and rubber-coated handle for construction adhesives and sealants.
Product picture: ISO-TOP PRESSFIX

Aluminium tube press with nylon union nut and rubber-coated handle for construction adhesives and sealants.
The ISO-TOP PRESSFIX aluminium tube press is equipped with a nylon union nut and rubber-coated handle for a safe grip and comfortable handling. It is especially suitable for applying construction adhesives and sealants in tubular bags up to 600 ml.

Padded tape for sealing and insulation
Product picture: ISO-ZELL PE-TAPE AND FIX-TAPE

Backfilling of sealant joints in the lower connection area with continuous windowsills
In old buildings there are often continuous windowsills. These are sometimes left in place even though there are no thermal benefits. In this case, the window is then sealed without a windowsill connection profile and the frame is placed directly onto the stone sill. This can then be sealed underneath with ISO-ZELL PE-TAPE or FIX-TAPE. These versatile sealing and padding tapes are airtight and impermeable to driving rain. The internal and external sealing are done with sealants.

Moulded EPDM sealing corners for various connection areas on buildings

Sealing against non-pressurised water & sealing in prefabricated buildings and solid construction as the second sealing level
ISO-CONNECT EPDM SEALING CORNERS are especially suitable for the bottom connection area in buildings.

Corners at the bottom base point of balcony doors, patio doors and lift-and-slide systems are often the Achilles heel with respect to sealing. Any leaks create a significant risk of allowing the uncontrolled ingress of water into the structure. These prefabricated EPDM sealing corners create a fast and reliable seal in the corner areas.

EPDM sealing system for external, bottom door and window connections
Product picture: ISO-CONNECT EPDM SEALING TRAY

Sealing against non-pressurised water & sealing in prefabricated buildings and solid construction as the second sealing level
The ISO-CONNECT EPDM SEALING TRAY was designed for the professional external sealing of bottom door and window connections and can be used for all types of window. It is a sealing system made from highly flexible EPDM which can be used both as the second sealing level beneath windowsills and in the vicinity of threshold connections for floor-level windows and doors.

The main benefit lies in the controlled removal of water or condensation which can collect in the bottom part of windows and doors and beneath aluminium and stone windowsills. In the critical corner areas, the pre-shaped, high-density vulcanised corners ensure a 100% seal.

The ISO-CONNECT EPDM SEALING TRAY is individually produced to precise dimensions, saving both time and money at the installation stage. All corner projections and upstands that are needed for sealing at the bottom base point are taken into account. It is especially ideal because the fitter does not need to cut or bond anything on the tray. All the corners are 100% tight and a high quality seal is quickly created for the bottom base point of the floor-level element or in the windowsill area.

Self-adhesive sealing membrane for the external sealing of floor connections
Product picture: ISO-CONNECT KSKSEAL

Sealing against non-pressurised water & sealing in prefabricated buildings and solid construction as the second sealing level
ISO-CONNECT KSKSEAL is an all-over self-adhesive sealing membrane made of polymer-modified bitumen with a flexible yet tearproof HDPE foil. It is used for the external sealing of floor connections and permanently protects components in contact with the ground against non-pressurised water (DIN 18533) for sealing thresholds, ground moisture and non-accumulating seepage water.

ISO-CONNECT KSKSEAL is therefore recommended when replacing floor-level elements on patios and balconies. The membrane seals against standing water and protects the bottom part of the doors against unusual water loads. These sealing levels always have to be replaced during renovation work. If ISO-CONNECT KSKSEAL has already been used, the new sealing membrane will adhere very well to the existing membrane.

For pre-treating substrates for ISO-CONNECT KSKSEAL sealing membranes
Product picture: ISO-TOP KSKSEAL PRIMER

For pre-treating substrates for ISO-CONNECT KSKSEAL sealing membranes
ISO-TOP KSKSEAL PRIMER is a solvent-free, high-quality primer designed to improve adhesion and based on a bitumen emulsion for ISO-CONNECT KSKSEAL sealing membranes.

ISO-TOP KSKSEAL PRIMER is suitable for substrate preparation on cellar walls, floor plates, foundations, balconies, underground garages and patios; it is also used on familiar and suitable mineral substrates before sealing with ISO-CONNECT KSKSEAL.

Insulating profiles to provide thermal insulation and a substructure for windowsills
Product picture: ISO-TOP WINDOW SILL FORMS

Insulating profiles to provide thermal insulation and a substructure for windowsills
The bottom connection to the window is weak from the insulation viewpoint, but it can be thermally optimised through the use of ISO-TOP WINDOW SILL FORMS. They greatly improve the PSI and f Rsi values and prevent the risk of mould growth on the internal surface.

ISO-TOP WINDOW SILL FORMS are insulating profiles made from XPS polystyrene; this has very high compressive strength and was specially developed as thermal insulation for aluminium lower external window sills. The window sill forms do not simply offer excellent thermal insulation; they also provide a compression-resistant substructure for windowsills made from aluminium or mineral materials.

ISO-TOP WINDOW SILL FORMS are individually produced and so are available for any shape and with the right dimensions for any design idea.

Das XPS (extruded polystyrene) material used is not only very compression-resistant, but it also provides a suitable substrate when combined with adhesives, sealing films or materials.

Pre-compressed joint sealing tape with 600 Pa impermeability to driving rain
Product picture: ISO-BLOCO 600 „PREMIUM EDITION“

Repointing work on prefabricated concrete elements
ISO-BLOCO 600 „PREMIUM EDITION“ can be used for professional repointing work on prefabricated concrete elements. The material structure of the PUR sealing tape, which is open to vapour diffusion, allows condensation which collects in the joint to escape to the outside in a controlled manner. The sealing tape’s excellent expansion capacity also guarantees efficient continuous movement absorption, thus preventing cracking. In contrast to sealants, ISO-BLOCO 600 „PREMIUM EDITION“ joint sealing tape can also be used on lightly soiled, smooth surfaces. It is not generally necessary to pretreat the “old” surfaces with primer.

Window renovation in rebate masonry
In window renovation, ISO-BLOCO 600 „PREMIUM EDITION“ is used in the rebate masonry to create the weather protection level. This is a common application in solid constructions with external wall insulation system and in brick facades.

Window renovation – end caps/EWI/windowsills
It is also ideal for sealing windowsill end pieces (also known as “end caps”) and for renovating external wall insulation systems or replacing windows. The sealing tape can also be used beneath windowsills in order to fill and close off the gap between the window breast and windowsill.

This joint sealing tape, which is resistant to driving rain in excess of 600 Pa, offers reliability during installation as it can be used in a wide range of joints. One particular benefit is that it does not have to be covered with spray-on sealants. In building renovations, joints are often covered with sealant not by the window fitter, but later by a separate “sealing specialist”. This is not the case if ISO-BLOCO 600 „PREMIUM EDITION“ is used – the window fitter can leave the site “finished”.

Pre-compressed joint sealing tape with 300 Pa impermeability to driving rain
Product picture: ISO-BLOCO 300 „PREMIUM EDITION“

Window renovation

ISO-BLOCO 300 „PREMIUM EDITION“ is used in window renovation in the rebate masonry to create the weather protection level. It is often applied in solid constructions and brick facades and when renovating the entire building envelope with an external wall insulation system.


This joint sealing tape, which is resistant to driving rain in excess of 300 Pa, offers reliability during installation as it can be used in a wide range of joints. One particular benefit is that it does not have to be covered with spray-on sealants. In building renovations, joints are often covered with sealant not by the window fitter, but afterwards by a separate “sealing specialist”. This is not the case if ISO-BLOCO 300 „PREMIUM EDITION“ is used – the window fitter can leave the site “finished”.

The in front of wall installation system with integrated thermally insulating core
Product picture: ISO-TOP WINFRAMER „TYP 1“

Retrofitting in two-leaf constructions as an insulating and fixing level and when modifying the installation level in front of the load-bearing wall shell
In many old and new brick constructions, the windows were hung in the air cavity with very thin and actually unsuitable and unapproved metal lug fixings (wall ties). When a window is replaced (without an in front of wall installation frame), the fitter is therefore often faced with the problem of not being able to fix the new window in place. The internal reveal must not be damaged, so it is not possible to use new ties.

An in front of wall installation system such as ISO-TOP WINFRAMER „TYPE 1“ can be retrospectively bonded and bolted inside the brick air cavity. This thermal structural filling provides an optimum supporting surface for fixing and correctly sealing the new windows. This creates a correct insulating and fixing level which optimises the thermal bridge created by the installation joint and can be reused if the window is replaced again.

High load-bearing capacity and load transfer in one
Product picture: ISO-TOP WINFRAMER „TYP 3

Retrofitting in two-leaf constructions as an insulating and fixing level and when modifying the installation level in front of the load-bearing wall shell
In many old and new brick constructions, the windows were hung in the air cavity with very thin and actually unsuitable and unapproved metal lug fixings (wall ties). When a window is replaced (without an in front of wall installation frame), the fitter is therefore often faced with the problem of not being able to fix the new window in place. The internal reveal must not be damaged, so it is not possible to use new ties.

An in front of wall installation system such as ISO-TOP WINFRAMER „TYPE 3“ can be retrospectively bonded and bolted inside the brick air cavity. This thermal structural filling provides an optimum supporting surface for fixing and correctly sealing the new windows. This creates a correct thermal and fixing level which optimises the thermal bridge created by the installation joint and can be reused if the window is replaced again.

Multi-functional insulating and sealing system for windows in double-leaf wall structures
Installation example: ISO-BLOCO FILLER

For filling the air cavity and for using a multi-functional tape in the connection area
The multi-functional insulating and sealing system ISO-BLOCO FILLER was specially developed for window renovation in double-leaf constructions. In double-leaf walls, the window is seated in the insulation level, between the inner and outer masonry. For a renovation, the new window is fitted back in the same place. The air cavity, which acts as thermal insulation, must be filled with a sealing product in order to meet energy efficiency standards.

In the past, there was only expanding foam available for this purpose. This often proved problematical because, for efficient sealing, considerable amounts of foam are needed and the product’s long drying time made it impossible to quickly resume working.

These problems can be avoided with ISO-BLOCO FILLER. The insulation and sealing system is installed directly in the opening between the inner and outer wall leaf before the window is fitted. It fills the gap and fixes into itself place as a permanent clamping effect is guaranteed by the material’s high elasticity. The material fills the gap airtight like a finishing layer, thus forming an optimum base for installation of the window.

Combined with strips of joint sealing tape, ISO-BLOCO FILLER also provides the rebate seal. After installation, the joint can be filled with a PU expanding foam such as ISO-TOP ELASTIFLEX or ISO-TOP THERMFOAM „BLUE LINE“ or it can be sealed with a multi-functional tape such as ISO-BLOCO HYBRATEC. The gap to the old plastered surface that remains on the inside is closed with sealant. ISO-TOP SILICONE F/FT or ISO-TOP SILICONE A/AT is suitable for external use, while ISO-TOP ACRYLSEAL F is ideal for internal use.

Multi-functional sealing tape with Microtherm technology
Product picture: ISO-BLOCO XTHERM

Filling of the functional level & backfilling sealants in renovation work
ISO-BLOCO XTHERM – multi-functional sealing tape. It is suitable for use in building renovation work to thermally insulate joints in windows, facades, timber constructions and roof coverings that are indirectly exposed to the weather. The use of Microtherm technology gives this joint sealing tape a much lower thermal conductivity than conventional expanding foams; it also offers very good sound-proofing properties of up to 62 dB. In addition to its outstanding thermal insulation and sound-proofing properties, it is also able to absorb movements long-term, making it perfect for sealing concealed movement joints. The material structure is permeable to vapour diffusion, enabling any moisture enclosed in the joint to escape. The joint thus remains dry and mould growth can be prevented.

ISO-BLOCO XTHERM is especially suitable for interior renovation work as there is no risk to fitters and residents from the off-gassing of toxic components. The multi-functional sealing tape is isocyanate-free, unlike many PUR foams.

The internal and external covering to finally create the airtightness and impermeability to driving rain levels and to provide a clean connection in the existing plastered reveals is then done with ISO-TOP ACRYLSEAL F and ISO-TOP SILICONE F/FT or ISO-TOP SILICONE A/AT.

Impregnated sealing tape for sealing against draughts, heat loss, dust and noise
Product picture: ISO-BLOCO HF

Filling of the functional level & backfilling sealants in renovation work

ISO-BLOCO HF is an impregnated and pre-compressed sealing strip which can be used in window connections as an insulating layer in the functional area or as insulation in connection joints between structural elements. It is suitable for sealing against draughts, heat loss, dust and noise.

This thermal insulation tape is quick and easy to install, expands automatically and is highly flexible. ISO-BLOCO HF is especially suitable for interior renovation work as there is no risk to fitters and residents from the off-gassing of toxic components. The sealing tape is isocyanate-free, unlike many PUR foams.

Low isocyanate PUR expanding foam for a healthy living environment

Low isocyanate PUR spray foam for a healthy living environment – no training required
The ISO-TOP THERMFOAM „BLUE LINE“ PUR foam is very suitable for renovation work since neither the installer nor the customer is exposed to high levels of isocyanate as is the case with conventional PUR spray foams. As it has a very low free isocyanate content of less than 0.1% making it healthy to use, ISO-TOP THERMFOAM „BLUE LINE“ can still be used without training after 24.08.2023.

The level of potentially harmful free isocyanates is just 1/1000th of that of conventional PUR spray foams. This protects not only the user, but also the residents who are normally at home while windows are replaced during renovation work.

Highly elastic PUR spray foam - insulation level and sound reduction area
Product picture: ISO-TOP ELASTIFLEX

Highly elastic PUR spray foam - insulation level and sound reduction area
In renovation work, PUR spray foam is the number 1 choice for filling cavities. ISO-TOP ELASTIFLEX is especially suitable for this as it remains flexible and applies little pressure. This is an advantage when foam-filling roller shutter housings (renovated housings in old lintel boxes) and when foam-filling beneath windowsills.

The highly elastic special PUR spray foam is roughly three times more flexible than conventional in-situ PUR foams. While comparable foams quickly cure to form rigid products that cannot accommodate relatively large movements of joints, ISO-TOP ELASTIFLEX remains permanently elastic in the functional area.

ISO-TOP ELASTIFLEX is very easy to dispense accurately and is ideal for filling the connection joint. In the top connection, where replacement roller shutter housings are often fitted during renovations, the easy to dispense foam prevents malfunctions of the roller shutter structure due to excessive pressure.

Dispensing gun with non-stick coating for PUR spray foams and PUR spray cleaners
Product picture: ISO-TOP GUN

Dispensing gun with non-stick coating for PUR spray foams and PUR spray cleaners
ISO-TOP GUN is suitable for all standard PUR spray foams and PUR cleaner cans with screw thread. The high-quality, fully non-stick coated dispensing gun is equipped a with 4-fold seal for optimum handling and particularly easy dispensing needle adjustment with end stop function. The rubber-coated handle and trigger guarantee a safe grip.

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Renovating old buildings to improve energy efficiency

The reasons speak for themselves!

 

Why should you want to improve your house’s energy efficiency?

Preventing heat losses in the house

Windows, doors, walls, roof – there are lots of places at which heat is lost from buildings. If you want to renovate an old building to improve energy efficiency, you will inevitably be faced with the issue of sealing structural joints. Because this offers massive potential for improving energy efficiency during your renovation.

Save heating costs and reduce energy costs

Lower heat losses logically also mean lower heating costs. It is generally true to say that modernisation to improve energy efficiency almost always pays for itself. It will also increase the value of your property – provided that the measures to improve energy efficiency were carried out correctly using high-quality sealing products.

Lower greenhouse gas emissions

A lower energy consumption will reduce the stress on the environment and contribute to climate protection. As they contribute around 30 % (German Environment Agency, 2022) to the total CO2 emissions in Germany, buildings offer great potential for reducing climate-damaging greenhouse gas emissions.

Increase comfort and cosiness in your living space

Seal windows correctly to prevent draughts

A heat loss from the window not only means a heat loss in the house – it can also be very unpleasant. At cold times of year, in particular, draughts can greatly reduce the cosiness and comfort of the house interior for its residents. Energy-efficient and sustainable sealing of the window joints is therefore of immense importance.

 

Prevent condensation and mould

As well as wasting energy, poorly sealed and insulated houses often have to cope with moisture and condensation. If this results in mould growth, this is not just a matter of well-being – the risks for the residents’ health are great.

Advantages of modernisation to improve energy efficiency for house owners and residents

A renovation to improve energy efficiency will bring you many benefits. The greatest added benefits are summarised clearly below:

Save energy

The potential savings will differ according to the condition of the old building. Thus, for example, renovating the roof to improve energy efficiency combined with thermal insulation for the exterior facade can reduce energy costs by 30 to 40%. If all the windows are replaced as well, the energy consumption can be further reduced by up to 15%.

Save money

Large amounts of warm air are often lost through structural joints, a fact that is reflected in high heating bills. If you renovate the joints in an old building to improve energy efficiency you will not only save energy. You will also save lots of money in the long term. Most investments in measures to improve energy efficiency pay for themselves after just a few years.

Increase value

Renovations to improve energy efficiency in old buildings, houses and apartments have a positive effect on their value since good energy efficiency is a powerful sales argument in the face of constantly rising raw material prices.

Wellbeing

When house owners decide to renovate their old building to improve energy efficiency it is often very important to prevent draughts, moisture and mould with a view to feeling better in their own four walls, and thus improving their quality of life.

Environmental awareness

As long as we obtain most of our energy from fossil sources, saving energy will not simply be a matter of reducing costs – it will also overall make a significant contribution to environmental protection.

Eliminating weak points for measures to improve energy efficiency in old buildings

Heat losses from the house

In most houses, the largest heat losses are through the building envelope. So you should pay most attention to the wall, facade, roof and window surfaces in your modernisation to improve energy efficiency. The costs of renovation work to improve energy efficiency generally pay for themselves quickly.

 

Roof refurbishment to improve energy efficiency or insulating the top storey ceiling can also make a large contribution, especially when there is poor thermal insulation in the existing roof. Combine this with renovating the outer facade and you can save up to 40% on your energy costs.

Heat loss from windows

One of the most common reasons for unnecessary heat loss are leaky windows and doors. Sometimes it is enough simply to properly seal windows and structural joints in the old building in order to reduce heat losses. To prevent leaky windows, the window connection joint must now be sealed in a special way that complies with the RAL principle of "inside tighter than outside".

 

It is not always cost-effective to completely replace a window with a modern thermally insulated window. In some cases it may be more sensible to just replace the glass (Ug value). The decisive factor for the whole window is the Uw value and the question of whether the energy saved is sufficient to pay back the cost of replacing the window over that window’s lifetime (around 35 years).

 

With single-glazed windows, it is almost always better to replace the old window in order to save energy. Improvements of up to 500% are technically conceivable. New windows can be sealed during installation to make them permanently air impermeable, thus reducing thermal bridges. This will prevent mould growth and other structural damage; building owners can enjoy their airtight windows for many years. Thermally insulated windows also increase the surface temperature on the inside of the glass, which positively affects the ambient temperature and increases comfort.

Costs involved in renovating an old building to improve energy efficiency

It is not possible to give a ballpark figure of how much it costs to renovate an old building to improve energy efficiency. The actual costs depend on factors such as the state of the building, its size and the desired energy savings.

Public funding for renovating old buildings to improve energy efficiency

It can be a big shock if a renovation to improve energy efficiency results in four or five digit costs, even if the renovation work will pay for itself in just a few years. There are, however, various options for grants and loans that may help to reduce costs to some extent.


In Germany, the government funding for efficient buildings (BEG) has offered support for renovating properties to improve energy efficiency since 2 January 2021. Grants are available for residential buildings, non-residential buildings and one-off measures.


Grants can be obtained for complete renovation to create an efficiency house, but they are also available for individual measures to improve energy efficiency such as thermal insulation for ceilings, roof and external walls, the purchase and installation of thermally insulating doors and windows, new heating systems and much more.

Support is available for all measures on buildings that improve energy efficiency. The technical design and construction support for the measures by energy efficiency experts can be subsidised. There are, however, certain (technical) conditions and restrictions for these grants. For further information, go to the website of the Federal Office of Economics and Export Control (BAFA).

To give you an initial impression of the amount of grant money available, we have checked out a few examples from the BEG’s list:

  • “Insulation of external walls, roof, storey ceilings and floor surfaces; replacement of windows and external doors” - funding rate 15%
  • Solar thermal systems - funding rate 25%
  • Heating optimisation - funding rate 15%
  • Technical design - funding rate 50%

The German Reconstruction Loan Corporation (KfW) also offers investment grants and loans at favourable interest rates. It is important, however, that you do not start the renovation work to improve energy efficiency until you have received confirmation for your application from the KfW.

Is renovation to improve energy efficiency mandatory in old buildings?

If you purchase or inherit an existing property, renovation to improve energy efficiency is mandatory. This is governed by the German Building Energy Act (GEG), which developed from the Energy Saving Ordinance (EnEV) and has been in force since 1 November 2020. In detached and semi-detached houses, energy efficiency standards must be implemented within two years after a change of ownership. Owners who have been living in their house for a long time are currently exempted from many obligations.

This obligation to carry out renovation work to improve energy efficiency relates to the areas of heating and the building envelope, including insulation of heating and hot water pipes in unheated rooms, thermal insulation of the top storey ceiling and replacement of old gas or oil boilers.

Common misconceptions concerning renovation to improve energy efficiency

Does thermal insulation increase the fire risk?

Essentially almost any other material burns faster than plastered masonry. This especially applies to renewable raw materials. Ultra-modern flame retardants greatly reduce the fire risk, however. There are also non-combustible insulating materials such as mineral wool or expanded clay.

Does thermal insulation increase the risk of mould formation?

This myth is both false and persistent. There is absolutely no reason why correctly executed external insulation should lead to mould growth. Quite the opposite. Mould grows where it is damp and cold. Moisture forms on cool spots because the moisture in the air condenses out and creates condensation. This could be cold spots on the walls, especially where there is poor ventilation, such as parts of the wall behind furniture. A well-insulated wall in a heated room, on the other hand, is warm, not cool. Correctly executed insulation is therefore a way to prevent mould growth.

There are no environmentally friendly insulating materials.

There is a whole raft of environmentally friendly insulating materials such as soft fibreboards, cork, hemp, dried impregnated meadow grasses and straw. Many building owners consider plant-based or animal-based products to be environmentally friendly insulating materials. Glass wool can also be regarded as an environmentally friendly insulating material, however, since many producers use recycled glass to manufacture it. Not to mention that mineral wool is itself 100% recyclable.

Renovation to improve energy efficiency will not pay for itself.

An old building has very many points with potential for thermal insulation and energy saving – from cellar to roof. In particular, optimised sealing of the building joints should be included in the renovation plans. This is because old buildings often lose lots of heat through leaky, poorly sealed joints. So renovation to improve energy efficiency will almost always pay for itself given the rising energy prices.

FAQ - Frequently asked questions concerning renovation work to improve energy efficiency in old buildings

What is renovation work to improve energy efficiency?

During renovation work to improve energy efficiency measures are taken to reduce transmission and convection heat losses throughout the building envelope. Existing buildings are renovated to improve energy efficiency by providing extensive thermal insulation and by reducing thermal energy flows through joints and seals.

What are measures to improve energy efficiency?

The most important measures to improve energy efficiency are:

  1. Replacement of windows with highly insulated frames and glass systems
  2. Insulating the ceiling of the top storey
  3. Insulating the entire roof cladding above the rafters
  4. Fitting external insulation made from polystyrene, mineral fibre or wood fibre to the entire building envelope
  5. Fitting solar thermal panels to supplement hot water heating
  6. Replacing the old oil boiler with a heat pump
  7. Hydraulic balancing of the heating system
  8. Replacing the heating valves with self-regulating valves
  9. Installing new distribution pumps with lower power consumption
  10. Insulating old roller shutter housings
  11. Installing centralised or decentralised ventilation systems with heat recovery
What else is included in a renovation to improve energy efficiency?

The following points are included in renovation work to improve energy efficiency in old buildings:

      1. Replacement of old windows and doors

 

      2. Roof insulation

 

      3. Insulating the ceiling of the top storey

 

      4. Insulating the external facade

 

      5. Insulating roller shutter housings

 

      6. Insulating the cellar ceiling

 

    7. Replacing the heating system
Which regulations from the German Building Energy Act (GEG) apply to old buildings?

The German Building Energy Act (GEG) defines limits for the U values when replacing windows and doors. The GEG also regulates the cases in which a heating system needs to be replaced and the insulation measures that should be taken, e.g. for the roof or ceiling on the top storey. It also defines whether a measure in addition to a heating system using renewable energy is required. If an external wall insulation system (EWI) is applied to an existing building, the GEG defines the minimum U value that must be achieved by this measure. It is therefore always important to check the requirements of the German Building Energy Act before commissioning and implementing such measures and to consult a specialist if you are in any doubt.

Why does renovation to improve energy efficiency pay for itself?

Saving energy IS sustainability! A renovation to improve energy efficiency will always pay for itself since energy is becoming ever more expensive. Investment in your own building will literally pay off. We also have the obligation to our environment and planet to reduce global warming and save resources.

So renovation work to improve energy efficiency in your old building will also pay for itself by maintaining the fabric of the building. When you come to sell it, a building that has been renovated to improve energy efficiency will not only sell more easily – it will go for a higher price. Our children and grandchildren will also thank us for thinking today about tomorrow and the day after tomorrow.

Will renovation work to improve energy efficiency in an old building achieve the same energy efficiency as in a new build?

This is absolutely possible. An existing building can be made into a “nearly zero-energy house” or even a passive energy house without doing anything else. It ultimately depends on how many measures to improve energy efficiency are implemented. Step-by-step conversion to a passive energy house is also technically possible without anything else.

When will it become mandatory to renovate to improve energy efficiency?

The point at which renovation to improve energy efficiency becomes mandatory is anchored in the German Building Energy Act (GEG). For heating systems there are deadlines which specify when they need to be replaced or for how long a heating system may be operated. Even after a change of ownership there are many obligations arising from the GEG with respect to the insulation and replacement measures required. The individual obligations for renovation work to improve energy efficiency are specified in the GEG.

What public funding and grants are available for renovation work to improve energy efficiency?

The public funding and grants available for renovation work to improve energy efficiency are constantly updated and provide via the KfW Bank. The full grant programmes, application forms and procedures for obtaining a grant are described in detail here.

Public funding is not unlimited, however, so it is worthwhile to take a look at these pages. For advice on your renovation to improve energy efficiency and the available public funding we recommend that you consult a building energy consultant (HWK) who will be on hand with help and advice and will also guide you through the grant application process.

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