Attic Insulation Over Blown In

Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all.

Attic insulation over blown in.

Fiberglass is just that thin fibers of glass that trap air. Before choosing blown vs. Someone needs to load the bags of insulation into the blower which will remain on the floor below. Attic insulation is accomplished with either fiberglass blankets batt or blown in insulation.

Batt insulation is available at home centers and lumberyards. Blown in insulation flows down around wall studs. Blown in insulation requires a professional. Blown in insulation in the attic seal attic bypasses.

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. Materials can be layered for added protection. Insulation efficiently fills gaps. 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.

Blown in fiberglass is considered flame resistant. Pull the existing insulation away from the roof. We include blown in attic insulation pros and cons but we can t recommend blown in fiberglass or cellulose as your best insulating choice. Don t forget to factor in whether you will be renting a blow machine or hiring someone to do it for you.

Recruit a helper. This calculator is to be used as an estimating tool only. For an r value between 38 and 49 the average person spends about 1 50 each square foot. Blowing in insulation is a messy prospect and you ll need to wear a dust mask protective eyewear.

The cost of blown in insulation is determined by which material you decide on the r value needed and the space of your attic. The type of material you use is up to you. Batt or rolled insulation or blown loose fill insulation fiberglass or cellulose can be installed on top of old insulation. If you stand on joists in the.

Batt insulation take time to read this column. The vapor retarder on top of or between layers of insulation can trap moisture. Insulation should be rolled out perpendicular to the joists and unfaced rolls should be used. Cellulose is recycled newsprint treated with a fire retardant.

Click the button to calculate the depth in inches and pounds of total insulation required for this job. Never stand on joists. If you choose loose fill insulation you ll need to rent a machine to install it. Install or repair vent chutes.

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. Position the new vent chute so the.