Attic insulation reduces heat transfer through your home’s ceiling to outside of the home.
Attics are often the easiest place to insulate because most attics provide easy access for the installation of additional insulation. The ready access and lower installation cost often make this a very cost-effective measure. Like all insulation, attic insulation helps keep the home warm in the winter and cool in the summer, providing greater comfort year-round.
Adding insulation to your attic can be very cost-effective. Attics should be insulated to R-49 or greater. This usually amounts to about 18 inches of fiberglass or cellulose.
Attics must be air-sealed before installing insulation in the attic to help reduce air infiltration through cracks, gaps and holes and to assure the insulation will provide the maximum benefits.
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Excessive air infiltrating the home through small gaps and crevices wastes approximately 25% of the typical homes’ heating and cooling costs.
In winter, cold air leaks into the home while heated air exits. In summer, hot outside air enters the home and brings unwanted humidity. This is caused by large (often unseen) holes in the attic and basement or crawlspace, floor and ceiling joints, electrical and plumbing penetrations, and even small cracks and gaps around windows and doors. While any one of these gaps may appear minor, collectively, they can have the same effect as leaving a window wide open all year long. Air infiltration can also cause water vapor to condense inside walls and attics, causing mildew and structural damage, and allowing insulation to become wet and ineffective. While it is possible to make a home too air-tight, more than 90% of homes are much too drafty. Excessive air infiltration could benefit from professional air sealing services. There are many products available for air sealing including caulks, foams, weather stripping, gaskets, and door sweeps.
A combustion appliance test must be performed if you have large gas appliances in the home, such as gas furnaces, water heaters or stoves. A combustion test will ensure there is adequate air being delivered to prevent the appliance exhaust from being pulled back into the home.