Pitched Roof U Value Requirement

Pitched roof with insulation between ceiling joists or between rafters determine the thickness of the insulation layer required to achieve a u value of 0 21 w m2k if insulation is between the joists and 0 26 w m2k if insulation is between the rafters.

Pitched roof u value requirement.

The tables below show the suggested u values in england wales and scotland. U value requirement opaque doors 1 0 w m k. U value requirement windows whole window u value 1 4 w m k. Of the building regulations 2007.

U value requirement floor 0 13 w m k. U value requirement roof 0 13 w m k. The actual specification required for a compliant building and necessary building fabric u value targets may vary depending on the actual overall proposed specification and the outcome of the energy. The below drawing shows the u value requirements set out for new properties in the building regulations for each element walls floors and roofs.

Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation. The new maximum u values are. Note the distinction between the domestic and non domestic columns. The required u value will depend on the location of the project england scotland or wales type of building domestic or non domestic and the application floor wall or roof.

U value requirements the u value of a building element i e walls floors or roofs is a measure of the thermal efficiency or heat loss through that element the lower the u value the better the thermeal efficiency of the element. U value requirement party walls 0 0 w m k. U value requirement semi glazed doors 1 2 w m k. Element u value w m2k walls 0 30 floors 0 22 flat roof or roof with integral insulation 0 20 pitched roof insulation at ceiling level 0 16 pitched roof insulation at between rafters 0 20 windows roof windows and roof lights 1 80 doors with more than 50 of the internal surface area glazed 2 20 other doors 3 00.

U value requirement external walls 0 18 w m k. Hitting amazing levels of 0 13w m will need 300mm of mineral wool or 180mm of rigid foam.