Pitched Roof U Value

A u value is a measure of heat loss in a building element such as a wall floor or roof.

Pitched roof u value.

These are expressed as a u value which needs to be achieved. U value calculations to en iso 6946 xt pr insulation for pitched roofs. Insulating above or above and between the roof timbers ensures that the structure is kept at or near the internal environmental conditions reducing thermal stress and condensation risk. 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.

An uninsulated roof has a u value of approximately 2 5 w m2k however adding insulation can achieve a value of 0 18 w m2k. It can also be referred to as an overall heat transfer co efficient and measures how well parts of a building transfer heat. Warm roof construction is a particularly effective way of insulating complex roofs. Final thing you should pay attention to when adding pitched roof insulation is the quality of the chosen insulation material through bba certificates and its ability to conform to the values prescribed by applicable building codes.

According to the uk building regulations pitched roofs should achieve the u value of 0 18 w m2 depending on the circumstances. This means that the higher the u value the worse the thermal performance of the building envelope. U value requirement windows whole window u value 1 4 w m k. U value requirement opaque doors 1 0 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.