Attic Insulation Over Blown In

This calculator is to be used as an estimating tool only.

Attic insulation over blown in.

Install or repair vent chutes. If you stand on joists in the. Loose fill blown in insulation is best for tight spaces or if your attic already has a layer of insulation that just needs to be topped off. Insulation efficiently fills gaps.

The type of material you use is up to you. Work from the perimeter of the attic toward the door or hatch so that you don t trample all over the insulation you just put in. Most attics are insulated with blown in loose cellulose r 3 5 per inch blown in loose fiberglass r 2 5 per inch or fiberglass batts r 3 2 per inch. Cellulose is recycled newsprint treated with a fire retardant.

Batt insulation is available at home centers and lumberyards. Fiberglass is just that thin fibers of glass that trap air. Blowing in insulation is a messy prospect and you ll need to wear a dust mask protective eyewear. Blown in fiberglass is considered flame resistant.

Pull the existing insulation away from the roof. Blown in insulation flows down around wall studs. Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all. Always cover the tops of the ceiling joists to make sure the insulation is deep enough to reach your target r value and to prevent thermal bridging the heat loss that occurs through the wood framing.

Blown in insulation in the attic seal attic bypasses. Someone needs to load the bags of insulation into the blower which will remain on the floor below. The cost of blown in insulation is determined by which material you decide on the r value needed and the space of your attic. Blown in insulation requires a professional.

Before choosing blown vs. The vapor retarder on top of or between layers of insulation can trap moisture. Batt insulation take time to read this column. Materials can be layered for added protection.

Never stand on joists. Pull back the existing insulation and use expanding spray foam the fire blocking type to seal any. Recruit a helper. Position the new vent chute so the.

Attic insulation is accomplished with either fiberglass blankets batt or blown in insulation. Don t forget to factor in whether you will be renting a blow machine or hiring someone to do it for you. Batt or rolled insulation or blown loose fill insulation fiberglass or cellulose can be installed on top of old insulation. We include blown in attic insulation pros and cons but we can t recommend blown in fiberglass or cellulose as your best insulating choice.

Insulation should be rolled out perpendicular to the joists and unfaced rolls should be used. If you choose loose fill insulation you ll need to rent a machine to install it.