Sloping Roof Insulation Regulations

Dual purpose structural deck and insulating planks.

Sloping roof insulation regulations.

Pitched roofs overview. The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m. In addition roofs must provide good thermal insulation and prevent the spread of fire from adjacent or adjoining properties. How to insulate a roof.

The insulated plasterboard should then be placed with the long edges running across the rafters. New roofs weight loading advertisement. The insulation may consist of 2 or 3 layers depending upon the type of insulated plasterboard. A new roof e g.

Be able to support loads weights provide resistance to heat loss insulation be ventilated to protect from condensation in most cases have adequate drainage. Cold deck this is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof. The function of a roof is to protect the building below from the weather. Building regulations for insulating a roof heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls.

In order to satisfactorily fulfil this function over a period of years it must be strong stable and durable. A qualified roofing contractor will be able to advise on this but here are some of the main guidelines. Sheet insulation fitted between the rafters the thicker the better but the size of rafter may limit the thickness possible once an allowance has been made for the required 50mm 2 inch air gap. For an extension will be required to.

Ventilated roofs require a 50 mm air gap above the insulation timber stop battens can be nailed into the side of the rafters to give the correct air gap when installing the insulation. The tables below show the suggested u values in england wales and. Lightweight insulating concrete lwic. Warm deck this is where the insulation is placed on top of the rafters joists and the roof covering is then placed over the insulation.

Building regulations and standards set the levels of thermal insulation required when carrying out building work either for new build or refurbishment projects. Scotland or wales type of building domestic or non domestic and the application floor wall or roof. The insulation used in low slope roof assemblies typically falls into one of the four categories. No ventilation is required for these types of roofs.

According to the uk building regulations pitched roofs should achieve the u value of 0 18 w m2 depending on. Sprayed polyurethane foam spf.