Sloping Roof Insulation Regulations

Resist the spread of fire from one property to another.

Sloping roof insulation regulations.

New roofs weight loading advertisement. In order to satisfactorily fulfil this function over a period of years it must be strong stable and durable. For an extension will be required to. 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.

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. A new roof e g. Lightweight insulating concrete lwic. The insulation may consist of 2 or 3 layers depending upon the type of insulated plasterboard.

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. 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. The insulation used in low slope roof assemblies typically falls into one of the four categories. Building regulations and standards set the levels of thermal insulation required when carrying out building work either for new build or refurbishment projects.

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. According to the uk building regulations pitched roofs should achieve the u value of 0 18 w m2 depending on. How to insulate a roof. Scotland or wales type of building domestic or non domestic and the application floor wall or roof.

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. The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m. The tables below show the suggested u values in england wales and. In addition roofs must provide good thermal insulation and prevent the spread of fire from adjacent or adjoining properties.

Sprayed polyurethane foam spf. Dual purpose structural deck and insulating planks. Pitched roofs overview. The function of a roof is to protect the building below from the weather.

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. No ventilation is required for these types of roofs.