Skylight Insulation Attic

Rigid foam is the optimal choice for an attic.

Skylight insulation attic. How to insulate a finished attic. If a skylight shaft contains an air permeable insulation such as cellulose or fiberglass the insulation should be enclosed on the attic side to create an air barrier. With a finished attic insulation must help keep the attic areas comfortable. Skylights are now sold as kits that usually include the necessary flashing materials as well.

If a skylight is installed in the roof over an attic a shaft must be built to connect the skylight with the ceiling underneath. Learn how to insulate a skylight shaft here. Skylight shaft walls are sometimes vertical but more typically they are sloped to create a splayed opening. Set aside existing attic floor insulation to expose the framing at the base of the skylight shaft to be air sealed.

Materials for a skylight are fairly basic especially in the attic. A finished attic should be insulated much like the rest of the house with insulation in the walls and ceiling. How to insulate and air seal skylight shaft walls. These range in price from 150 500 for a 2 x 4 ft sized skylight.

Because the shaft walls separate the interior of the house from an unconditioned attic it s essential that they be well insulated. Unsealed attics are often insulated along the attic floor with blown fiberglass or cellulose insulation. Repair skylight flashing from the roof exterior and replace any damaged framing as necessary. That means insulating the attic floor only not the walls and having vents in the roof.