Skylight Insulation Attic

Learn how to insulate a skylight shaft here.

Skylight insulation attic.

A finished attic should be insulated much like the rest of the house with insulation in the walls and ceiling. These range in price from 150 500 for a 2 x 4 ft sized skylight. Materials for a skylight are fairly basic especially in the attic. Unsealed attics are often insulated along the attic floor with blown fiberglass or cellulose insulation.

Set aside existing attic floor insulation to expose the framing at the base of the skylight shaft to be air sealed. That means insulating the attic floor only not the walls and having vents in the roof. However these kits are for use with asphalt shingles. How to insulate and air seal skylight shaft walls.

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. Because the shaft walls separate the interior of the house from an unconditioned attic it s essential that they be well insulated. Rigid foam is the optimal choice for an attic. With a finished attic insulation must help keep the attic areas comfortable.

Inspect the existing skylight for signs of water leakage such as water stains and rot. 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. How to insulate a finished attic.