Non-Domestic

To use the Elemental method, individual exposed building elements and other elements forming the insulation envelope of a dwelling or a building consisting of dwellings should have a U value which do not exceed the value given in the table below.

Maximum U values for building elements using the Elemental Method:

Exposed element	W/m2K
Pitched roof: insulated between rafters insulated between joists	0.20 0.16
Flat roof or roof (including pitched) with integral insulation	0.25
Exposed wall, external wall or wall	0.30
Exposed floor or floor	0.25
Windows, doors and rooflights: metal frames (area weighted average) wood on PVC frames (area weighted average)	2.20 2.00
Vehicle access and similar large doors (including doors located in walls)	0.70

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Non-Domestic