Insolating The Attic Directly On The Roof Joints

If the plastic sheeting is in pieces overlap the pieces by 8 inches and staple it in place directly to the roof rafters and the wall.

Insolating the attic directly on the roof joints.

Insulating the pitched roof if your attic is often used or perhaps you plan to convert it in the future you will need to insulate the inner surfaces of the roof. An advantage of spray foam is it s quick whereas foam board needs to be cut and measured which can be a chore. With one inch extruded polystyrene foam board insulation between the drywall and the roof members the r value increases to r 25 with no thermal bridges. The technically correct approach depends on a number of factors.

Do not use plastic sheeting in this case. Essentially this system offers excellent insulation value because wood conducts heat and cold. An unfinished attic is an attic that is not considered part of the living space. Insulating an unfinished attic can be a simple diy project.

Place the plastic sheeting on top of the rolled insulation. Whether or not there is an inner roof lining and the total thickness of the roof structure. If you re insulating the roof directly to insulate the roof itself you either use spray foam or retrofit with it with rigid foam board.