Dormer roofs are roofs that contain rooms and can present considerable challenges when it.
Insulating dormer attic space.
Do not insulate the dormer s ceiling when it connects to an uninsulated attic space.
In this case the area behind the knee wall will be uncomfortably hot or cold.
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.
This can be done with spray foam or rigid foam cut to fit between rafters and foamed in place with a foam gun.
Do dormer bungalows and houses with attics in the roof space need a different approach to insulation.
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.
If the air distribution is in the attic space then consider insulating the rafters to move the distribution into the conditioned space.
1a attic access door.
There are two basic ways to insulate a finished attic.
Cut the ceiling s batt insulation to size with the knife.
Staple the dormer s ceiling insulation s flaps to the roof trusses with the insulation s paper backing facing down.