Insulating Rafter Headers Above Outside Walls On Roof

Heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls.

Insulating rafter headers above outside walls on roof.

Rigid foam board is just above the roof deck or an exterior insulation option. Although there are many different circumstances that may call for insulating roof rafters the means to determine the necessity for insulating rafters remains the same. 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. The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m.

Both products are high performance pir insulation boards which have been specifically designed for this type of roof construction. It typically has 3 variations. Floors above cold spaces such as vented crawl spaces and unheated garages. All exterior walls including 3a walls between living spaces and unheated garages shed roofs or storage areas.

Building regulations for insulating a roof. 3c foundation walls in heated basements full wall either interior or exterior. The previous four options are all used beneath the roof. 3b foundation walls above ground level.

How to insulate a roof. For example if the space beneath the rafters is going to be used for a living area then you will need to insulate the roof rafters. 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.