Adding Fiberglass Batts To Attic Blown In Insulation

This will lead to non uniform r values.

Adding fiberglass batts to attic blown in insulation. 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. Fiberglass is considered the best attic insulation for diy projects. The photo above shows an attic insulated with blown cellulose. Working with fiberglass insulation requires wearing personal protection gear.

Place the batts into. Cut fiberglass batts by scoring them with a utility knife. 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. Batt or rolled insulation or blown loose fill insulation fiberglass or cellulose can be installed on top of old insulation.

I don t know about that but it s a common insulation material that works much better in the blown form than in batts. Batts and blankets can leave gaps and voids. The r factor of blown in fiberglass is usually 2 3 to 2 8 per inch of material. To keep the blown in insulation from falling through the attic hatch opening make a 2x12 dam around the hatch perimeter.

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. 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. Size each piece to fit snugly between the floor joists in your attic. Cut two layers of r 19 fiberglass batt insulation slightly larger than the hatch and staple duct tape to the hatch edges to secure it in place.

Batts don t fit well in odd spaces. Fiberglass comes from what i ve heard one major fiberglass insulation manufacturer call a rapidly renewable resource sand. You d need a thickness of. Don t forget attic pipes.

The material tends to compress over time. Put on goggles and gloves to protect yourself while handling fiberglass insulation. Install fiberglass batts over existing batt insulation. Once installed and expanded to the uniform manufactured thickness batts offer a known r factor.

Insulation should be rolled out perpendicular to the joists and unfaced rolls should be used.