Pitched Roof Target U Value

U value requirement semi glazed doors 1 2 w m k.

Pitched roof target u value.

Required area weighted average u value. We assume that the occupants try to keep all the rooms at 20 c for 15 hours per day whilst the outside temperature is at zero 0 c. Ground floor no underfloor heating 0 45w m k. U values and air leakage levels determine space heating demand.

These are expressed as a u value which needs to be achieved. Pitched roof sloping ceilings. Passive performance built in cavity system. The u value calculator covers all the main ways of building walls flat roofs pitched roofs and floors using kingspan insulation products.

U value requirement windows whole window u value 1 4 w m k. External doors windows rooflights curtain walling. That the floor is a suspended timber floor. 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.

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. An advanced warm roof system of xtroliner sarking insulation that delivers the passive u value target of 0 15 w m k in a single layer avoiding thermal bridging and allowing for more effective membrane detailing. New elements extension conversion existing walls refurb new walls extensions new floors refurb existing floors extension ceiling level. Ground floor underfloor heating 0 15w m k.

New elements extension conversion for replaced or refurbished roofs. Improve your home insulation with our high quality insulation products. U value requirement opaque doors 1 0 w m k. We don t count the pitched roof as part of the house as we will insulate the floor of the loft.

Cold roof ceiling level 0 16w m k. The quick free and easy way to find out the insulation thickness and the u value you need for your building project. External walls cavity 0 55w m k external walls other not cavity 0 35w m k. U value requirement roof 0 13 w m k.

There are a few good u value calculators online that if you are short on time are worth checking out. The tables below show the suggested u values in england wales and scotland. For replacement or refurbished roofs.