For further information contact the building regulations division.
Flat roof insulation thickness for building regulations.
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.
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.
Roof insulation thickness for building regulations will vary depending on the type of insulation used.
This is placed over the roof joists and an board normally external ply is laid on top.
Insulation can also help to limit condensation and contribute to acoustic insulation depending on the type of insulation used.
Insulation between flat roof joists 50mm air gap above decking surrey building control guidance note number 13.
U value of a flat roof.
Or else on the interior of the building just.
Different insulants have different efficiencies and performance levels which affects the thickness required to meet building regulations.
Flat roofing insulation will have a huge impact on the energy efficiency of your property.
A lower u.
Insulation of new flat roofs must satisfy part l of the building regulations.
Below that there are more detailed guides to the thermal insulation parts of building regulations standards.
Householder s guide to flat roofing.
Since april 2006 this also applies to refurbishment of flat roofs.
The thickness of insulation will depend on the type of insulant.
Used within a bauder waterproofing system our products meet current uk building regulations part b for fire protection.
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.
Walls are defined by regulation 2 3 of the building regulations 2010 as being thermal elements.
The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m.
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.
As you can see below there are separate regulations for england wales and scotland.
Bitumen membranes should be protected from the sun see surface protection section.
Thermoplastic or elastomeric are the most effective and should extend up adjacent walls at least 150mm from the roof surface.
Take our online course on the building regulations and standards.
Ventilation is required for these roofs.
