Add Attic Insulation Over Blown Insulation

If you use fiberglass over loose fill make sure the fiberglass batt has no paper or foil backing.

Add attic insulation over blown insulation.

Blown in insulation overview. The vapor retarder on top of or between layers of insulation can trap moisture. You can do it yourself for about 500. Batt or rolled insulation or blown loose fill insulation fiberglass or cellulose can be installed on top of old insulation.

How much does attic insulation cost. Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all. 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. 3 have a friend add material to the hopper.

We offer our review of the three most popular types of attic insulation with a look at each one s pros and cons. Your options for attic insulation range from radiant barriers to sheets of mineral wool but most homeowners stick with products made from cellulose or fiberglass. You d need a thickness of. It needs to be unfaced.

Adding rolled batt or blown in insulation over existing insulation is not a problem. Insulation should be rolled out perpendicular to the joists and unfaced rolls should be used. You can add loose fill on top of fiberglass batts or blankets and vice versa. Blowing attic insulation isn t hard but it s dusty sweaty work.

Don t add faced insulation on top of your existing insulation because the vapor retarder in between layers leads to trapped moisture. If you need to add insulation in your attic save big by blowing in cellulose insulation yourself. When adding additional insulation you do not have to use the same type of insulation that currently exists in your attic. Attic insulation also prevents condensation bacteria and mold from forming on your framing members and plywood roof sheathing.

Learn how one caller made an installation mistake and increased his chances of mold and condensation when he tried to add unfaced insulation over his blown in attic insulation. The pros charge 1 500 to 2 000 to do a 1 200 sq ft. Blown in spray foam batts and blankets. The attic is the most important place to install insulation b ecause heat rises to make your home more energy efficient it is important to insulate the floor of the 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. Find out how to install unfaced insulation correctly over blown in insulation. Do not tack down any rolled insulation. Cellulose is recycled newsprint treated with a fire retardant.