Insulate Roof Rafters Uk

Mineral wool rolls are ubiquitous and cheap meaning a whole roof on a standard home could be insulated to the recommended 270mm with a spend of little more than 200.

Insulate roof rafters uk. If you re considering turning your attic into conditioned storage or living space it s worth changing tactics to insulate between the rafters and wall joists instead of the floor. Having chosen to insulate your rafters and potentially use the loft space as an extension of your living area you need to be aware of some safety features before you read on. It s also within the capability of most diyers although not the most pleasant of tasks. Insulating at rafter level is considerably more expensive than most standard loft insulation.

Insulating a roof is perhaps the easiest of all the energy saving home improvements. Some companies may offer to fix your damaged or leaking roof by spraying foam insulation directly onto the underside of the roof without first fixing the problem. This means insulating between or below the sloping beams that form the construction and support a sloping roof. An efficient room in a roof in a new build property where over rafter insulation is not desirable.

You can use rigid foam panels or do as tom silva does with nearly all houses these days. If you leave these uninsulated then the heat will bypass your new insulation making it largely ineffective. This roof type will require a breathable membrane like kingspan nilvent to be fitted above the insulation. As well as insulating the roof you will have to insulate any gable walls party walls and chimneys in the loft space.

Cold pitched roof. The rafters are joined together by a horizontal ridge board at the top and tied together by ceiling joists at the bottom. Hire a pro to install spray foam insulation. The construction build up for this can be seen on our online u value calculator.

When it comes to pitched roofs however adding a thick layer of insulation to the rafters can result in a depth of roof construction that may not suit every site meaning over rafter insulation sarking only is not a viable option. Arguably the most popular pitched roof solution installing insulation between and under the rafters uses the depth of the structural timbers to best effect. As this requires fitting insulation above the rafters the roof covering will have to be removed in order to fit the insulation. Even then the depth of insulation now required to meet the regulations means that very large fascia boards and wide soffits are required.

In this case we would suggest fitting kooltherm k7 pitched roof board between the rafters and kooltherm k118 insulated plasterboard to the inside face of the. Insulation if your attic is going to be converted into livable space then you will need to insulate the roof rafters. Insulating the rafter space will give you a warm loft. Install ventilation baffles into the space between the rafters before you install the insulation usually by stapling into place.

Fitting a continuous layer of insulation over the rafters will solve the issue of cold bridging but is only an option on new builds or renovations where the roof tiles are being stripped and relaid.