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 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 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 semi glazed doors 1 2 w m k.

Of the building regulations 2007. 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 windows whole window u value 1 4 w m k. U value requirement external walls 0 18 w m k.

U value requirement party walls 0 0 w m k. The u value requirments for building elements are outlined in part l. The new maximum u values are. U value requirement floor 0 13 w m k.

The tables below show the suggested u values in england wales and scotland. 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 opaque doors 1 0 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.

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. 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.