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To insulate the roof itself you either use spray foam or retrofit with it with rigid foam board.
Proper way to insulate a roof with blown in insulation. Because blown insulation comes out as chunks of cellulose or fiberglass it does a better job of filling every crevice of the attic. High density damp spray is used in the attic or walls. If you re insulating from scratch put the right vapor barrier in the right place though some batts come with a paper or foil facing that can act as a vapor barrier tom silva prefers to use 6 mil polyethylene sheeting cut to fit between the joists and with seams sealed by foil tape to prevent moisture from seeping into insulation. Loose fill insulation is blown into the attic or walls.
Pre 1930s wiring which poses a fire hazard to insulation material. Rather than insulating the whole home and potentially causing problems like excess humidity you can properly seal the attic of an old house. If the studs are 16 5 inches on center and you re using batts made for 16 inches you ll have a crack on each side that air can move through says tom. If you re insulating the roof directly.
Some common insulation methods can actually cause long term damage. An advantage of spray foam is it s quick whereas foam board needs to be cut and measured which can be a chore. Spray foams are used in the attic or. Insulate and air seal any knee walls vertical walls with attic space directly behind them in your home as well.
Rigid board insulation is intended for use in confined spaces such as exterior walls and cathedral ceilings. Before insulating seal any air leaks and make roof and other necessary repairs. In this case it s best to use cavity filling foam or blown in insulation. There are three types of blown in insulation.
Insulating the attic and roof. With a more complete layer of insulation throughout your attic you ll experience lower energy costs and more effective heating cooling compared to simple batts installations. Fiberglass insulation gets its r value from the amount of air it traps between its fibers. Roughly a quarter of the average home s heat is lost through the roof.
If it is located in a conditioned part of the house also remember to insulate and air seal your attic access. The insulation itself can burn or melt in some cases or can over insulate a wire or connection causing a fire which causes the structure itself to burn.
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