Spray Foam – New Build

In new build the use of an insulating material can be sprayed readily to any chosen depth, is ideal in achieving the higher values required and eliminating air leakage.

For instance, a typical timber frame wall would have required 50 mm of polyurethane foam under 2002 rules – to meet .0.34w/m²K. Now an increase in thickness of 75mm will achieve a 20% reduction. This gives an acceptable U Value of 0.27W/m²K. Similarly, ground floors change from 40mm to 50mm in required thickness of insulating foam to reach the 0.22m²K target. For single story buildings, where the ground floor represents a high proportion of total space, extra insulation values can be achieved.