Adding Fiberglass Batts To Attic Blown In Insulation

Batt or rolled insulation or blown loose fill insulation fiberglass or cellulose can be installed on top of old insulation.

Adding fiberglass batts to attic blown in insulation.

Size each piece to fit snugly between the floor joists in your attic. When blown into attics and wall spaces loose fill fiberglass offers an average r 2 5 thermal value per inch the higher the number the greater the insulating effect. Batts don t fit well in odd spaces. Don t forget attic pipes.

This will lead to non uniform r values. Put on goggles and gloves to protect yourself while handling fiberglass insulation. Fiberglass comes from what i ve heard one major fiberglass insulation manufacturer call a rapidly renewable resource sand. The r factor of blown in fiberglass is usually 2 3 to 2 8 per inch of material.

Because blown in insulation which is fiberglass generally can go on top of the existing insulation the negative thing about blown in insulation is that it makes the attic absolutely impassable when you re done and you need a lot more thickness of it because it has more air inside of it than you would if you used fiberglass bats. Fiberglass is considered the best attic insulation for diy projects. Insulate your attic with fiberglass batts when it comes to insulating your attic there are really only two types of insulation worth considering fiberglass batts or blown in insulation. You d need a thickness of.

Batts and blankets can leave gaps and voids. The material tends to compress over time. Insulation should be rolled out perpendicular to the joists and unfaced rolls should be used. To keep the blown in insulation from falling through the attic hatch opening make a 2x12 dam around the hatch perimeter.

Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all. Install fiberglass batts over existing batt insulation. The photo above shows an attic insulated with blown cellulose. Once installed and expanded to the uniform manufactured thickness batts offer a known r factor.

Blown in insulation thickness can vary in an attic space. Place the batts into. I don t know about that but it s a common insulation material that works much better in the blown form than in batts. Working with fiberglass insulation requires wearing personal protection gear.

Blown in insulation consists of bags of fiberglass or cellulose that are chopped up and blown in to the attic or wall from a machine.