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BASF POLYURETHANES - Curved Roof Presents No Problem For WALLTITE® Spray Foam Insulation

WALLTITE® CL100 spray foam insulation from BASF Polyurethanes has been installed on the internal roof of a penthouse apartment in a new mixed development in Hove as part of the requirements of the Code for Sustainable Homes Level 3. Achieving a U-value of 0.1w/sqmK was the deciding factor in meeting planning conditions which stipulated that the property was to be designed and built to the elements outlined in the Code.

The curved nature of the roof in the penthouse flat required an insulation solution which could achieve the requisite radius and guarantee to stay in place down the curve. Local architects, Felce and Guy Partnership discovered that the mineral fibre insulation material initially specified would not be flexible enough to adhere to the curve and therefore replaced it with a more adaptable spray foam insulation – WALLTITE.

WALLTITE was applied to the curved roof over an area of 144 m2 and sprayed to a depth of 235mm to fill a void of 300mm. The ceiling linings were then tacked onto the joists to seal the gap. The continuous spray foam cured and expanded to produce an airtight surface which will eliminate air leakage, reduce carbon emissions and lower energy bills once the apartment is occupied.

Simon Moore from Felce and Guy Partnership states “In order to meet one of the planning conditions required to achieve Level 3 of the Code for Sustainable Homes, a low U-value was important. Due to the nature of the site, there were constraints on how this could be achieved. The simplest way was to decrease the U values of the various elements, of which the roof was one. The Code measures the sustainability of a home against design categories, rating the ‘whole home’ as a complete package. The sites boundaries are the external walls and so there was no opportunity to utilise other elements outlined in the Code such as greywater, recycling facilities, ground source heat pumps or to add in some green spaces. Improving the insulation with a better U value was the answer.”

WALLTITE provides the specifier with complete design freedom as the spray foam adapts to the shape of the substrate providing an ideal solution for insulating difficult areas such as curved roofs.

Installed by BASF Polyurethane’s approved contractor, Isotech, the fast applied, seamless, airtight solution left a minimal amount of surface area without insulation. By virtually eliminating air leakage, WALLTITE with its closed cell structure helps control the movement of vapour and moisture throughout the building, reducing energy loss in line with Part L. Created to aid sustainable solutions, WALLTITE PU spray foam does not deteriorate with age and its thermal properties are therefore maintained over the life of the building.

“I am very pleased with the installation by Isotech. “The spray foam was installed quickly and met all of the criteria that we needed. It has proven to be a great product that has made the roof construction possible,” adds Simon.

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