Pitched Roof U Value Requirement

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.

Pitched roof u value requirement. U value requirement floor 0 13 w m k. The tables below show the suggested u values in england wales and scotland. The u value requirments for building elements are outlined in part l. U value requirement opaque doors 1 0 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. Note the distinction between the domestic and non domestic columns. The new maximum u values are. U value requirement windows whole window u value 1 4 w m k.

Hitting amazing levels of 0 13w m will need 300mm of mineral wool or 180mm of rigid foam. The below drawing shows the u value requirements set out for new properties in the building regulations for each element walls floors and roofs. If you have any additional enquiries then feel free to drop the celotex technical centre a line on technical celotex co uk. 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.

Of the building regulations 2007. U value requirement party walls 0 0 w m k. U value requirement external walls 0 18 w m k. U value requirement roof 0 13 w m k.

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. 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.