Flat Roof Insulation Thickness For Building Regulations

Insulation between flat roof joists 50mm air gap above decking surrey building control guidance note number 13.

Flat roof insulation thickness for building regulations.

Take our online course on the building regulations and standards. Thermoplastic or elastomeric are the most effective and should extend up adjacent walls at least 150mm from the roof surface. Walls are defined by regulation 2 3 of the building regulations 2010 as being thermal elements. A thermal layer of fibreglass polystyrene or other insulating material should be inserted either above the roof decking the warm roof model which is suitable for homes or permanent residences.

This is placed over the roof joists and an board normally external ply is laid on top. Or else on the interior of the building just. Since april 2006 this also applies to refurbishment of flat roofs. The thickness of insulation will depend on the type of insulant.

Different insulants have different efficiencies and performance levels which affects the thickness required to meet building regulations. The extent to which the work on the element is controlled and the amount of upgrading needed depends on the particular circumstances of the thermal element. Below that there are more detailed guides to the thermal insulation parts of building regulations standards. 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.

For further information contact the building regulations division. Householder s guide to flat roofing. As you can see below there are separate regulations for england wales and scotland. All roofs should be insulated.

Warm deck the type of insulation for this is usually of a rigid type and the thickness will vary depending on the manufacturer s specifications. Bitumen membranes should be protected from the sun see surface protection section. Used within a bauder waterproofing system our products meet current uk building regulations part b for fire protection. Flat roofing insulation will have a huge impact on the energy efficiency of your property.

Insulation of new flat roofs must satisfy part l of the building regulations. The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m. Insulation can also help to limit condensation and contribute to acoustic insulation depending on the type of insulation used. U value of a flat roof.

The type of insulation required will depend on the immediate environment in your area and specific building regulations. Roof insulation thickness for building regulations will vary depending on the type of insulation used.