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Fit and forget – no remedial visits after large movement, unlike wet sealants

ISO-BLOCO T-MAX is a special PUR sealing tape impregnated with a fire resistant polymeric dispersion. It is specifically designed for larger joints which require large movement accommodation. In addition to supplying a weathertight seal against wind driven rain it also has thermal and acoustic insulation properties, complying with UK Building Regulations.

ISO-BLOCO T-MAX is particularly well suited for multistory timber framed buildings where a large amount of differential movement is expected between fenestration or roofs and the external facades, allowing up to 39 mm of movement, with a single tape. Ideal for window head or cill and under roof eaves.



  • fulfills UK Building Regulations and RAL recommendations

  • seals against driving rain, snow, wind and dust

  • accommodates up to 39 mm of movement (>350 % MAF)

  • fit and forget – no remedial visits after large movement, unlike wet sealants

  • perfectly flat visual surface finish

  • vapour permeable – breathable

  • thermal and acoustic insulating properties

  • self-adhesive to aid installation / location

  • permanently elastic with long life expectancy

  • can be painted with standard emulsion paints

  • compatible with all known building materials

  • constant quality control to DIN EN ISO 9001 and DIN standards



A versatile product that has a wide range of uses, but generally for sealing construction joints (including larger movement joints) in areas such as:


  • external facade seals on timber framed buildings

  • prefabricated concrete, and other material, elements (including civil engineering)

  • perimeter seals for fenestration (windows / doors)

  • cladding panels

  • curtain walling


Used in a variety of construction methods and industries including:


  • timber and / or steel framed buildings

  • general construction & civil engineering

  • modular construction and other MMC types




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