Sloping Roof Insulation Regulations

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

Sloping roof insulation regulations.

Be able to support loads weights provide resistance to heat loss insulation be ventilated to protect from condensation in most cases have adequate drainage. Lightweight insulating concrete lwic. The tables below show the suggested u values in england wales and. The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m.

Sprayed polyurethane foam spf. The function of a roof is to protect the building below from the weather. Pitched roofs overview. The insulation used in low slope roof assemblies typically falls into one of the four categories.

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. In order to satisfactorily fulfil this function over a period of years it must be strong stable and durable. In addition roofs must provide good thermal insulation and prevent the spread of fire from adjacent or adjoining properties. Building regulations and standards set the levels of thermal insulation required when carrying out building work either for new build or refurbishment projects.

A new roof e g. The insulated plasterboard should then be placed with the long edges running across the rafters. 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. New roofs weight loading advertisement.

The insulation may consist of 2 or 3 layers depending upon the type of insulated plasterboard. 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. Dual purpose structural deck and insulating planks. No ventilation is required for these types of roofs.

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. For an extension will be required to. How to insulate a roof. Scotland or wales type of building domestic or non domestic and the application floor wall or roof.

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. Resist the spread of fire from one property to another.