Spray Foam Insulation for Loft Conversions

Benefits of loft conversions

Loft conversions can add significant space and value to most homes. In the majority of homes the loft is a draughty, dusty space used only to store Christmas decorations and old boxes. However, with ever increasing house prices, it can be a sound financial decision to convert your loft to extra living space. Even if you are not planning a full loft conversion, but would like to be able to use that added space, a basic conversion could be an excellent investment in your home.

Legal requirements for loft conversions

When carrying out a full loft conversion, Building Regulations must be adhered to in order for the conversion to go as planned. The new regulations for insulation (Part L) mean that more thermal insulation than ever before must be installed to achieve lower U values. If you are planning on using mineral wool to achieve this, it means that you may have to raise the floor level by up to 300mm in order to have the room for the insulation. Also, installing the insulation at floor level means that the room will still be affected by the temperature of the roof substrate, and will also suffer the draughts through the roof.

Issues with other methods of roof insulation

Other options for insulating at roof level include using rigid polyurethane boards placed between the rafters. These boards are a similar material to the spray polyurethane foam which we install and therefore have similar insulation qualities. However, because these boards have to be cut to fit in between the rafters it means that the insulation is far less efficient. When installing these boards, they must be cut to fit between the rafters and then sealed at the joins to try and form a thermal barrier. Also, because of the installation method, a continuous air gap must be left behind the boards to allow for air circulation. This is to prevent the build up of condensation behind the boards which could have serious consequences in later life.

Benefits of spray foam roof insulation

Using our spray foam insulation system when carrying out a loft conversion allows us to install enough insulation to meet Building Regulations within the depth of most rafters. Our spray foam is applied in-situ, which means that there are no gaps to seal and therefore a more efficient thermal barrier. Using our spray foam also means that we do not have to leave an air gap behind the foam to prevent the condensation build up. Because the foam is applied in a monolithic thermal barrier, there are no gaps which could lead to condensation problems.

If you are thinking of converting your loft, or would just like a more useable loft space, give us a call and we can help you from start to finish.