Loft Conversion Roof Insulation Thickness

The roof section requires 300mm of mineral wool insulation e g.

Loft conversion roof insulation thickness.

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. 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. So to insulate a pitched roof for a loft conversion there are two main methods that we would recommend. 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.

Rockwool or 150mm of slab foam insulation such as celotex. If your loft is easy to access does not have damp problems and is not a flat roof you could probably insulate it yourself. Again this should be insulated to the recommended depth of 270mm. Loft insulation thickness regulations.

Existing roofs and shared roofs. 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. Room in the roof loft conversion. Currently building regulations for loft conversions dictate that the u value of the roof must be 0 18w m2 or lower.

Thickness required in mm for l1b new build extensions loft conversions dormers and renovation of dwellings. Giving a total of 100mm of insulation. 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.

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

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