Skylight Insulation Attic

If a skylight is installed in the roof over an attic a shaft must be built to connect the skylight with the ceiling underneath.

Skylight insulation attic.

How to insulate a finished attic. Learn how to insulate a skylight shaft here. Skylights are now sold as kits that usually include the necessary flashing materials as well. However these kits are for use with asphalt shingles.

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

That means insulating the attic floor only not the walls and having vents in the roof. 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. Repair skylight flashing from the roof exterior and replace any damaged framing as necessary.

Materials for a skylight are fairly basic especially in the attic. Rigid foam is the optimal choice for an attic. Skylight shaft walls are sometimes vertical but more typically they are sloped to create a splayed opening. 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.