Skylight Insulation Attic

Unsealed attics are often insulated along the attic floor with blown fiberglass or cellulose insulation.

Skylight insulation attic.

Skylight shaft walls are sometimes vertical but more typically they are sloped to create a splayed opening. With a finished attic insulation must help keep the attic areas comfortable. A finished attic should be insulated much like the rest of the house with insulation in the walls and ceiling. 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. How to insulate and air seal skylight shaft walls. However these kits are for use with asphalt shingles. Materials for a skylight are fairly basic especially in the attic.

These range in price from 150 500 for a 2 x 4 ft sized skylight. How to insulate a finished attic. Rigid foam is the optimal choice for an 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.

Because the shaft walls separate the interior of the house from an unconditioned attic it s essential that they be well insulated. Inspect the existing skylight for signs of water leakage such as water stains and rot. Repair skylight flashing from the roof exterior and replace any damaged framing as necessary. Learn how to insulate a skylight shaft here.