Adding Fiberglass Batts To Attic Blown In Insulation

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.

Adding fiberglass batts to attic blown in 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. 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. 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. 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.

The material tends to compress over time. Cut fiberglass batts by scoring them with a utility knife. Place the batts into. The photo above shows an attic insulated with blown cellulose.

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. Batts don t fit well in odd spaces. Once installed and expanded to the uniform manufactured thickness batts offer a known r factor.

The r factor of blown in fiberglass is usually 2 3 to 2 8 per inch of material. Batts and blankets can leave gaps and voids. 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.

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

This will lead to non uniform r values. Working with fiberglass insulation requires wearing personal protection gear. Blown in insulation thickness can vary in an attic space. You d need a thickness of.

Don t forget attic pipes.