Flat Roof Insulation Thickness Building Regulations

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.

Flat roof insulation thickness building regulations.

A lower u. As you can see below there are separate regulations for england wales and scotland. For further information contact the building regulations division. Insulation between flat roof joists 50mm air gap above decking surrey building control guidance note number 13.

This is placed over the roof joists and an board normally external ply is laid on top. Used within a bauder waterproofing system our products meet current uk building regulations part b for fire protection. 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. Depending on where you live in the uk snowfall must also sometimes be considered in determining the gradient of the fall.

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. Summary of flat roof building regulations. The thickness of insulation will depend on the type of insulant. 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. 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. Ventilation is required for these roofs. Insulation can also help to limit condensation and contribute to acoustic insulation depending on the type of insulation used.

Hitting amazing levels of 0 13w m will need 300mm of mineral wool or 180mm of rigid foam. Take our online course on the building regulations and standards. U value of a flat roof. Different insulants have different efficiencies and performance levels which affects the thickness required to meet 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. Flat roofing insulation will have a huge impact on the energy efficiency of your property. If you are replacing more than 25 of the roofing area then you will also need to replace the thermal insulation. Walls are defined by regulation 2 3 of the building regulations 2010 as being thermal elements.