Insulating a pitched roof at rafter line – to create what is usually known as a warm roof – makes full use of the building volume by making the roof space available for occupation. Installing part of the insulation between the rafters reduces the depth of insulation required above the rafters, which reduces the load on fixings and makes installation easier.

1. Quinn Therm QR boards between rafters and supported by battens
2. Quinn Therm QR boards over rafters
3. Stop batten
4. Counter battens
5. Vapour open underlay
6. Roof covering