What type and thickness of floor insulation should be used?
Any board type of insulation can be used. However the foiled high-density polyurethane foam is likely to suffer less site damage due to the high compressive strength. Pipe fixing staples also hold very firmly into this type of insulation. The thickness of insulation required is calculated to achieve a U-value of 0.25, which is the minimum permitted by the Building Regulations. Insulation thickness will therefore be different for every building and should be calculated when designing the building.
