Pitched Roof Rafter Insulation

Insulating a pitched roof space a guide to insulation inside a pitched roof.

Pitched roof rafter insulation.

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. 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. 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.

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. Pitched roof rafter level warm roof application overview our insulation solutions for warm roofs maximise both space and thermal efficiency whilst also contributing to acoustic performance. Arguably the most popular pitched roof solution installing insulation between and under the rafters uses the depth of the structural timbers to best effect.

This means insulating between or below the sloping beams that form the construction and support a sloping 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. An additional advantage is the excellent pressure and gas tightness of the entire system. Insulating the rafter space will give you a warm loft.

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. An efficient room in a roof in a new build property where over rafter insulation is not desirable. The roof will typically be insulated above the rafter line creating what is most commonly known as a warm roof. Installation of over rafter double layer insulation on a pitched roof the assembly of two layers of insulation panels provides perfect protection against cold and heat.