Loft Conversion Roof Insulation Thickness

Completed loft conversion with roof windows.

Loft conversion roof insulation thickness.

Thickness required in mm for l1b new build extensions loft conversions dormers and renovation of dwellings. Currently building regulations for loft conversions dictate that the u value of the roof must be 0 18w m2 or lower. 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. Giving a total of 100mm of insulation.

The roof section requires 300mm of mineral wool insulation e g. Room in the roof loft conversion. So to insulate a pitched roof for a loft conversion there are two main methods that we would recommend. Existing roofs and shared roofs.

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. 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. Saint gobain insulation uk offers a variety of celotex and isover products suitable for installation in a loft. Loft insulation is any material installed within the joists of a pitched roof space to reduce heat loss from the building below.

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. 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. If you want to see what thickness of insulation achieves the above u values visit our online u value calculator and select pitched roofs.

0mm 270mm loft insulation 120mm 270mm loft insulation northern ireland 0mm 270mm loft insulation 120mm 270mm loft insulation diy loft insulation. Loft insulation thickness regulations are there for a reason. Again this should be insulated to the recommended depth of 270mm. If you have an existing loft conversion or attic room there may not be much insulation in place but increasing the amount of insulation can be expensive and disruptive so you will need to balance the costs and benefits.

Loft insulation thickness regulations. Can i retrofit insulation to an existing loft conversion. With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same.