Loft Conversion Roof Insulation Thickness

Existing roofs and shared roofs.

Loft conversion roof insulation thickness.

Pitched roof insulation at ceiling level 0 35 0 16 pitched roof insulation at between rafters 0 35 0 20 flat roof or roof with integral insulation 0 35 0 25. Loft insulation is any material installed within the joists of a pitched roof space to reduce heat loss from the building below. Can i retrofit insulation to an existing loft conversion. Again this should be insulated to the recommended depth of 270mm.

So to insulate a pitched roof for a loft conversion there are two main methods that we would recommend. The roof section requires 300mm of mineral wool insulation e g. Thickness required in mm for l1b new build extensions loft conversions dormers and renovation of dwellings. 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.

With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same. To help you learn about the types of insulation which will be best for your home we have compiled this guide to roof and loft insulation which are a great place to start when insulating your home. Currently building regulations for loft conversions dictate that the u value of the roof must be 0 18w m2 or lower. 0mm 270mm loft insulation 120mm 270mm loft insulation northern ireland 0mm 270mm loft insulation 120mm 270mm loft insulation diy loft insulation.

Saint gobain insulation uk offers a variety of celotex and isover products suitable for installation in a loft. Giving a total of 100mm of insulation. Completed loft conversion with roof windows. 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.

If your loft is easy to access does not have damp problems and is not a flat roof you could probably insulate it yourself. Loft insulation thickness regulations are there for a reason. If you want to see what thickness of insulation achieves the above u values visit our online u value calculator and select pitched roofs. Loft insulation thickness regulations.

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. Roof and loft insulation can save you money keep your house warm and help the environment however it can also seem like a very complex subject which many different types of insulation available. Rockwool or 150mm of slab foam insulation such as celotex.