Pitched Roof Rafter Insulation

This means insulating between or below the sloping beams that form the construction and support a sloping roof.

Pitched roof rafter insulation.

Insulating the roof above the rafters is known as warm roof insulation as the rafters are brought into the insulated envelope of the building. The rafters are joined together by a horizontal ridge board at the top and tied together by ceiling joists at the bottom. The roof will typically be insulated above the rafter line creating what is most commonly known as a warm roof. Firstly just to make it clear when we are talking about rafter level we mean the timbers that support the pitched roof.

Insulating a pitched roof above the rafters is the common method chosen for new builds and re roofing existing detached buildings as it provides superior thermal performance for the building. In this blog post we explore some of the options available. For this method of pitched roof insulation we recommend using quinn therm qr roof insulation boards between the rafters and quinn therm ql kraft insulation boards below the rafters. Both products are high performance pir insulation boards which have been specifically designed for this type of roof construction.

Utilising a pitched roof as a usable living space is an effective way to maximise the square meterage of a residential development. An additional advantage is the excellent pressure and gas tightness of the entire system. An efficient room in a roof in a new build property where over rafter insulation is not desirable. Sheet insulation fitted between the rafters the thicker the better but the size of rafter may limit the thickness possible once an allowance has been made for the required 50mm 2 inch air gap.

Insulating the rafter space will give you a warm loft. Its versatility is the key to its popularity whether being used to achieve. When insulating a pitched roof at rafter level there are a number of key design considerations which will affect the build up of the roof and the choice of insulation. Arguably the most popular pitched roof solution installing insulation between and under the rafters uses the depth of the structural timbers to best effect.