Maximum average elemental U value (Elemental Heat Loss Method) - Dwellings and non dwellings

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.

There are two levels of U value; Column A and column B. Column selection depends on the type of heating system to be installed in a dwelling and whether or not it has a central heating boiler with a SEDBUK of at least the percentages given in the table below.Maximum U values for building elements using the Elemental method:

Exposed element	Maximum average elemental U value (Elemental heat loss method) New buildings & extensions to existing buildings W/m2K	Maximum average elemental U value (Elemental heat loss method) Material alterations to, or material change of use of, existing buildings W/m2K
Pitched Roof: Horizontal insulation ceiling level Insulation on slope	0.16 0.20	0.35 0.35
Flat Roof	0.22	0.35
Roof	-	-
Walls	0.27	0.60
Floors: Ground Exposed	0.25 0.25	- 0.60
Windows, glazed doors and roof lights	2.20	2.20
Vehicle access doors or similar large doors (non dwellings only)	1.50	-

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Maximum average elemental U value (Elemental Heat Loss Method) - Dwellings and non dwellings