Flat Roof Insulation Thickness Building Regulations

The thickness of insulation will depend on the type of insulant.

Flat roof insulation thickness building regulations.

Flat roofing insulation will have a huge impact on the energy efficiency of your property. Hitting amazing levels of 0 13w m will need 300mm of mineral wool or 180mm of rigid foam. Ventilation is required for these roofs. Roof insulation thickness for building regulations will vary depending on the type of insulation used.

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. Depending on where you live in the uk snowfall must also sometimes be considered in determining the gradient of the fall. 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.

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. The actual specification required for a compliant building and necessary building fabric u value targets may vary depending on the actual overall proposed specification and the outcome of the energy. Walls are defined by regulation 2 3 of the building regulations 2010 as being thermal elements. 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.

U value of a flat roof. Different insulants have different efficiencies and performance levels which affects the thickness required to meet building regulations. As you can see below there are separate regulations for england wales and scotland. Below that there are more detailed guides to the thermal insulation parts of building regulations standards.

Summary of flat roof building regulations. A lower u. All roofs should be insulated. Insulation can also help to limit condensation and contribute to acoustic insulation depending on the type of insulation used.

For further information contact the building regulations division. The type of insulation required will depend on the immediate environment in your area and specific building regulations. The below drawing shows the u value requirements set out for new properties in the building regulations for each element walls floors and roofs. If you are replacing more than 25 of the roofing area then you will also need to replace the thermal insulation.