Insulation for parapet walls


The junction of an external wall and flat roof is a difficult part of a building to design well. Continuing the wall above roof level to create an upstand also creates a thermal bridge, that was very difficult to detail before the development of PERINSUL HL insulation for parapet walls.


PERINSUL HL courses in with a masonry external wall at the level of the flat roof insulation, creating a connection with the wall insulation and eliminating the thermal bridge. The product is laid in mortar just like masonry, meaning no change in construction method or delay to the progress of work.

Downloadable documents

      system characteristics

      • Proven concept: full suite of calculated and accredited details, including psi values, available for common applications featuring a structural thermal bridge.

      • Energy efficiency: reduces building heat loss and space heating demand.

      • Load-bearing: strong and unique insulation element, capable of bearing structural loads.

      • Healthy living: elimination of heat loss at ceiling edges prevents ‘cold spots’.


      How to install PERINSUL HL

      in parapets

      legal notice

      about PERINSUL products

      The information relating to the products and systems contained on this website is provided in good faith and for general information purpose only. Such information is in any event subject to our product’s legal notice, the content of which users are invited to acknowledge under the following link: Legal Notice