Insulation For Flat Roof Regulations

Insulation on the floor of the attic figure 1.

Insulation for flat roof regulations.

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. These are expressed as a u value which needs to be achieved. Insulation entirely above the roof deck directly below the roof deck or both above and below the roof deck. The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m.

Understanding building regulations relating to insulation blog posted on 26th september 2019 whether you are involved in a new build or a refurbishment project there are a certain set of standards for thermal insulation which need to be adhered to according to building regulations. It is top quality and the most cost effective product for your flat roof. While expensive the best insulation is polyiso rigid foam. A ventilation gap usually 50mm should be provided between the top of the insulation and underside of the roof covering to allow the air to flow across.

For a 1 inch board equivalent of 6 r value. Possible locations for insulation within the roof assembly as addressed by ibc include. U value of a flat roof to comply with part l of the building regulations 2010 all roofs to rooms except those in unheated buildings should be thermally insulated to a maximum u value of of 0 18 w m k. Building regulations standards set the levels of thermal insulation required when carrying out building work either for new build or refurbishment projects.

If moisture is a major concern you can also install xps rigid insulation which offers superior moisture resistance. A qualified roofing contractor will be able to advise on this but here are some of the main guidelines. A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value. There must be a slope of 1 80 part h of the building regulations regarding drainage state that water should drain to one or two edges waterproofing should extend up the adjacent walls at least.

Cold deck the thickness of insulation required will vary depending on the material you decide to use and the manufacturer s specification. Heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls. Insulation tight to the roof deck i e. One of the main benefits you will receive from installing a warm flat roof is condensation will not become an issue because of the positioning of the insulation.

You can expect to pay about 55 100 sq ft.