Loft Conversion Roof Insulation Thickness

This equates to a thick 270mm layer of fibre or wool insulation about 175mm of rigid board insulation or around 125mm of high performance spray foam.

Loft conversion roof insulation thickness.

The rafter thickness is often less than 120mm so a batten may be required along each rafter to allow the 50mm spacing and the 70mm insulation. 0mm 270mm loft insulation 120mm 270mm loft insulation northern ireland 0mm 270mm loft insulation 120mm 270mm loft insulation diy loft insulation. Rockwool or 150mm of slab foam insulation such as celotex. 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.

Check out our how to video at the link below. Once this layer has been laid then lay 170mm insulation across the top of the joists at 90 degrees to the joists. Hitting amazing levels of 0 13w m will need 300mm of mineral wool or 180mm of rigid foam. If your loft was insulated in the 60s then no because the recommended value was only 25mm.

Time to get the insulation finished and get this place warm. Currently building regulations for loft conversions dictate that the u value of the roof must be 0 18w m2 or lower. If you had your insulation fitted after 2013 then you might be okay because it was at this time the government stated that if a loft insulation was 125mm in thickness then it would be considered insulated. Https youtu be w4mkphzmqxw contact us restorat.

If your loft is easy to access does not have damp problems and is not a flat roof you could probably insulate it yourself. Insulation table for use on new build extensions loft conversions dormers and renovation of dwellings thickness required in mm for l1b new build extensions loft conversions dormers and renovation of dwellings timber solid timber concrete 0 2 w m2 k 0 2 w m2 k 0 16 w m2 k 0 2 w m2 k 0 2 w m2 k 0 3 w m2 k 0 3 w m2 k kingspan thermapitch tp10. The roof section requires 300mm of mineral wool insulation e g. If you are pursuing a renovation project and wish to renew more than 25 of your roof space your loft insulation must also meet the standards required by these regulations.

In order to insulate the loft always start as far away from the loft hatch as possible and then work back towards the hatch. In england the required minimum u value for pitched roofs insulated at rafter level is 0 18 w m k whilst for flat ceilings the minimum is 0 16 w m k.