Adding Extra Insulation To Attic Walls

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

Adding extra insulation to attic walls.

You should be able to see if there is insulation in the wall. Batt or rolled insulation or blown loose fill insulation fiberglass or cellulose can be installed on top of old insulation. It needs to be unfaced. With boric acid added for fire resistance shredded recycled telephone books tax forms and newspapers all contribute to making safe cellulose insulation blown in cellulose is injected into the wall cavities by a series of holes drilled into either the inside or outside of the walls.

The blue line in all the graphs below shows the heat flow through the wall and the red columns show either the stepwise or cumulative reduction in heat flow compared to what it was with an r 2 r 11 or r 16 wall. Affix rigid foam insulation to the attic side of the hatch or door. Blowing attic insulation isn t hard but it s dusty sweaty work. Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all.

Block all vents in the attic floor with baffles making sure to extend the baffles at least four inches above the planned thickness of your insulation. Add weatherstripping around the perimeter and a sweep to the door of a walk up attic. The grade of batting will vary depending on the wall that you re insulating. How much does attic insulation cost.

Choose fiberglass insulation batting. The pros charge 1 500 to 2 000 to do a 1 200 sq ft. Inspect the exterior walls by using an electrical outlet. Use a zippered insulated tent to keep the enclosure draft free attic tent at 7 attic cover insulator 120.

You can add loose fill on top of fiberglass batts or blankets and vice versa. The r value of the batt measures the thermal resistance so the higher the r value the more effectively. Pull out a small amount of insulation if needed to help. Blowing in attic cellulose is conceivably a do it yourself job.

Pull down stair or ladder. Remove the outlet cover and shine a flashlight into the crack around the outlet box. You can do it yourself for about 500. As you keep adding more and more insulation you keep reducing the heat flow through the wall more and more.

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. Fiberglass is just that thin fibers of glass that trap air. Attic hatch or door.

Blown in insulation overview. Insulation should be rolled out perpendicular to the joists and unfaced rolls should be used. Turn off the power to the outlet. Cellulose is recycled newsprint treated with a fire retardant.