Insulating Dormer Attic Space

1a attic access door.

Insulating dormer attic space.

2d extend insulation into joist space to reduce air flows. Dormer roofs are roofs that contain rooms and can present considerable challenges when it. In case the space on the existing rafters is not enough you can fix a batten to the rafters underside in order to enhance the depth. Measure the dormer s ceilings for insulation with the tape measure if needed.

Do dormer bungalows and houses with attics in the roof space need a different approach to insulation. In this case the area behind the knee wall will be uncomfortably hot or cold. 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. 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.

Staple the dormer s ceiling insulation s flaps to the roof trusses with the insulation s paper backing facing down. If the air distribution is in the attic space then consider insulating the rafters to move the distribution into the conditioned 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. This can be done with spray foam or rigid foam cut to fit between rafters and foamed in place with a foam gun.

Cut the ceiling s batt insulation to size with the knife.