Insulating Rafter Headers Above Outside Walls On Roof

The previous four options are all used beneath the roof.

Insulating rafter headers above outside walls on roof.

Floors above cold spaces such as vented crawl spaces and unheated garages. Also insulate 4a any. 3b foundation walls above ground level. Both products are high performance pir insulation boards which have been specifically designed for this type of roof construction.

Building regulations for insulating a roof. Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels. The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m. 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.

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. All exterior walls including 3a walls between living spaces and unheated garages shed roofs or storage areas. Rigid foam board is just above the roof deck or an exterior insulation option. It typically has 3 variations.

3c foundation walls in heated basements full wall either interior or exterior. Insulating the roof above the rafters is known as warm roof insulation as the rafters are brought into the insulated envelope of the building. How to insulate a roof.