Insulating Rafter Headers Above Outside Walls On Roof

Also insulate 4a any.

Insulating rafter headers above outside walls on roof.

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 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. Heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls. All exterior walls including 3a walls between living spaces and unheated garages shed roofs or storage areas.

Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels. Building regulations for insulating a roof. Rigid foam board is just above the roof deck or an exterior insulation option. 3c foundation walls in heated basements full wall either interior or exterior.

Floors above cold spaces such as vented crawl spaces and unheated garages. 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. The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m. 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.

It typically has 3 variations. The previous four options are all used beneath the roof. 3b foundation walls above ground level.