Air Seal Attic Chimney

Watch and see how to air seal attic penetrations to improve energy efficiency and prevent warm air rising inside a home from entering the attic space.

Air seal attic chimney.

I am installing the chimney using a square cathedral support which doubles as an attic radiation shield. Hello gba community i have a question about air sealing an icc excel chimney servicing a woodstove in manitoba canada. Air sealing the most common attic air leaks electrical plumbing and hvac contractors use your attic to conceal the wires pipes and ducts that comprise the mechanical systems in your home. Access the attic through a crawl space in the ceiling using a stepladder or use or the attic stairs.

Measure the four sides of the chimney where it goes through the ceiling framing and add up the. Attic air sealing is the priority your focus should be on the attic when you begin air sealing. Once the metal is in place. Foam or caulk small gaps in your attic.

If you do seal air leaks around flues make sure that you use heat resistant caulk. Because the pipe gets hot building codes require 1 in. Of clearance from class b flues 2 in. Attics are often under insulated and under sealed leading to wasted energy and wasted spend by the homeowners.

Once the air seal was accomplished jerome installed a roxul mineral woolinsulation barrier around the chimney. The dirt comes from dusty air leaking into your attic. This isolated the masonry from an r 60 blanket of cellulose insulation that was blown in place after all the airsealing measures were implemented. This horizontal air seal is known as fire blocking or draft stopping and it prevents the spread of fire between floors by sealing air spaces that permit its passage.

Imagine that you have a small boat and steered it into a cluster of jagged rocks. While most of the air leaks in your attic are probably covered up by insulation you can detect these air leaks by looking for patches of dirty or dark insulation. Keep the fireplace flue damper tightly closed when not in use. From masonry chimneys to any combustible material including insulation.

The opening around a furnace or water heater flue is a major source of warm air into the attic photo 5.