In finished attic rooms with or without dormer insulate 2a between the studs of knee walls 2b between the studs and rafters of exterior walls and roof 2c and ceilings with cold spaces above.
Insulating dormer attic space.
There are two basic ways to insulate a finished attic.
1a attic access door.
If the attic kneewall spaces are used for storage then you ll have to insulate along the roof slope down to the eaves and create an air barrier at the rafters.
If the air distribution is in the attic space then consider insulating the rafters to move the distribution into the conditioned space.
Dormer roofs are roofs that contain rooms and can present considerable challenges when it.
This can be done with spray foam or rigid foam cut to fit between rafters and foamed in place with a foam gun.
2d extend insulation into joist space to reduce air flows.
Do not insulate the dormer s ceiling when it connects to an uninsulated attic space.
If only the living space will be insulated wrap the insulation around the room s walls and ceiling and then continue along the floor of the non living space.
Staple the dormer s ceiling insulation s flaps to the roof trusses with the insulation s paper backing facing down.
Cut the ceiling s batt insulation to size with the knife.
In this case the area behind the knee wall will be uncomfortably hot or cold.
Do dormer bungalows and houses with attics in the roof space need a different approach to insulation.