Flat Roof Insulation Thickness Building Regulations

Roof insulation thickness for building regulations will vary depending on the type of insulation used.

Flat roof insulation thickness building regulations.

Flat roofing insulation will have a huge impact on the energy efficiency of your property. All roofs should be insulated. 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. The thickness of insulation will depend on the type of insulant.

Hitting amazing levels of 0 13w m will need 300mm of mineral wool or 180mm of rigid foam. As you can see below there are separate regulations for england wales and scotland. Used within a bauder waterproofing system our products meet current uk building regulations part b for fire protection. Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation.

This is placed over the roof joists and an board normally external ply is laid on top. Insulation between flat roof joists 50mm air gap above decking surrey building control guidance note number 13. Below that there are more detailed guides to the thermal insulation parts of building regulations standards. For further information contact the building regulations division.

Depending on where you live in the uk snowfall must also sometimes be considered in determining the gradient of the fall. Different insulants have different efficiencies and performance levels which affects the thickness required to meet building regulations. U value of a flat roof. Walls are defined by regulation 2 3 of the building regulations 2010 as being thermal elements.

The below drawing shows the u value requirements set out for new properties in the building regulations for each element walls floors and roofs. 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. Take our online course on the building regulations and standards. Insulation can also help to limit condensation and contribute to acoustic insulation depending on the type of insulation used.

Ventilation is required for these roofs. If you are replacing more than 25 of the roofing area then you will also need to replace the thermal insulation. Summary of flat roof building regulations. A lower u.