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. U value requirement semi glazed doors 1 2 w m k. Highlighted in violet is the first time the u value requirement for a component was strengthened. Note the distinction between the domestic and non domestic columns. External walls cavity 0 55w m k external walls other not cavity 0 35w m k.

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. Cold roof ceiling level 0 16w m k. U value requirement party walls 0 0 w m k.

If you have any additional enquiries then feel free to drop the celotex technical centre a line on technical celotex co uk. U values by building component. U value requirement external walls 0 18 w m k. The tables below show the suggested u values in england wales and scotland.

Pitched roof sloping ceilings. Ground floor no underfloor heating 0 45w m k. Hitting amazing levels of 0 13w m will need 300mm of mineral wool or 180mm of rigid foam. 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.

Of the building regulations 2007. U value requirement roof 0 13 w m k. We don t count the pitched roof as part of the house as we will insulate the. U value requirement windows whole window u value 1 4 w m k.

External doors windows rooflights curtain walling. The u value requirments for building elements are outlined in part l. 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.

The below drawing shows the u value requirements set out for new properties in the building regulations for each element walls floors and roofs. The new maximum u values are. 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.