Roof U Value Wales

Listed below are the typical elements of a pitched roof.

Roof u value wales.

For more information see our articles and how to videos below. Unsure what level of thermal performance you require. There are two additional compliance guides for building. Welcome to the welsh technical guidance page for part l of the building regulations.

They cover new dwellings document l1a work to existing dwellings l1b new buildings other than dwellings l2a and works to existing buildings other than dwellings l2b. 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. Non essential cookies are also used to tailor and improve services. Where more than 25 per cent of a ceiling below a cold loft space or flat roof is being replaced then building regulations would normally apply.

Each element enables the roof to span across the building and support the tiles covering on top as well as being able to transfer the loads weight created by any wind and snow down to the walls. Check out our guide on what performance is required for the uk insulation building regulations. Roof 0 15 well i say taken care actually the document states that even these values should only be considered as a starting point towards compliance. A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value.

By continuing to use this site you agree to our use of cookies. This means that the higher the u value the worse the thermal performance of the building envelope. It is proposed to use mineral wool insulation between and over the joists with a thermal conductivity of 0 04 w m k. It can also be referred to as an overall heat transfer co efficient and measures how well parts of a building transfer heat.

These can be supported with a detailed report. Note the distinction between the domestic and non domestic columns. We provide u value calculations to show compliance with current building regulations standards and best practice. This section contains the approved documents l1a and l1b for download below.

A u value is a measure of heat loss in a building element such as a wall floor or roof. Determine the thickness of the insulation layer above the joists required to achieve a u value of 0 20 w m2k for the roof construction shown below. Gov wales uses cookies which are essential for the site to work. Ridge board this forms the apex of the roof and is where the rafters are fixed to both sides.

What is a u value. The tables below show the suggested u values in england wales and scotland.