Pitched Roof U Value Requirement

Of the building regulations 2007.

Pitched roof u value requirement.

U value requirement semi glazed doors 1 2 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. Typically the u value requirement of a pitched roof is 0 18 w m2k which you could achieve with your 150mm between the rafters and another 12mm fixed under the rafters.

The below drawing shows the u value requirements set out for new properties in the building regulations for each element walls floors and roofs. U value requirement opaque doors 1 0 w m k. The u value requirments for building elements are outlined in part l. 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 roof 0 13 w m k. U value requirement windows whole window u value 1 4 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. The new maximum u values are.

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. If you have any additional enquiries then feel free to drop the celotex technical centre a line on technical celotex co uk. U value requirement party walls 0 0 w m k. U value requirement floor 0 13 w m k.

U value requirement external walls 0 18 w m k. The tables below show the suggested u values in england wales and scotland.