Insulating Dormer Attic Space

1a attic access door.

Insulating dormer attic space. Dormer roofs are roofs that contain rooms and can present considerable challenges when it. Do dormer bungalows and houses with attics in the roof space need a different approach to insulation. 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. There are two basic ways to insulate a finished attic.

2d extend insulation into joist space to reduce air flows. Measure the dormer s ceilings for insulation with the tape measure if needed. 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. This can be done with spray foam or rigid foam cut to fit between rafters and foamed in place with a foam gun.

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. Rigid insulation the rigid insulation method requires the utilisation of 150mm thick insulation in between the rafters along with a 50mm air gap in order to avert cold bridging. In this case the area behind the knee wall will be uncomfortably hot or cold. Do not insulate the dormer s ceiling when it connects to an uninsulated attic space.

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