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.

Adding fiberglass batts to attic blown in insulation.

This will lead to non uniform r values. You d need a thickness of. To keep the blown in insulation from falling through the attic hatch opening make a 2x12 dam around the hatch perimeter. 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.

To install fiberglass batts over existing insulation lay the batts perpendicular to the joists so they do not compress the insulation below whether you live in a warm weather state as i do or in a cooler northern climate it s hard to stay comfortable and keep your energy bills in check if you don t have adequate insulation in the attic. Blown in insulation thickness can vary in an attic space. Batts don t fit well in odd spaces. Don t forget attic pipes.

Fiberglass comes from what i ve heard one major fiberglass insulation manufacturer call a rapidly renewable resource sand. Fiberglass is considered the best attic insulation for diy projects. Batt or rolled insulation or blown loose fill insulation fiberglass or cellulose can be installed on top of old insulation. Place the batts into.

The material tends to compress over time. The photo above shows an attic insulated with blown cellulose. I don t know about that but it s a common insulation material that works much better in the blown form than in batts. 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.

Cut fiberglass batts by scoring them with a utility knife. Insulation should be rolled out perpendicular to the joists and unfaced rolls should be used. Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all. 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. Size each piece to fit snugly between the floor joists in your attic. Install fiberglass batts over existing batt insulation. 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.

Once installed and expanded to the uniform manufactured thickness batts offer a known r factor.