Air Seal Attic Chimney

Seal air leaks around fireplace chimneys furnaces and gas fired water heater vents with fire resistant materials such as sheet metal or sheetrock and furnace cement caulk.

Air seal attic chimney.

Because the pipe gets hot building codes require 1 in. During the construction of your home they drill and cut holes through the walls to run these pipes and wires. If you do seal air leaks around flues make sure that you use heat resistant caulk. Of clearance from class b flues 2 in.

The dirt comes from dusty air leaking into your attic. The opening around a furnace or water heater flue is a major source of warm air into the attic photo 5. 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. 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. I have already purchased the support and chimney components and am ready to install the chimney. From masonry chimneys to any combustible material including insulation. Imagine that you have a small boat and steered it into a cluster of jagged rocks.

Attic air sealing is the priority your focus should be on the attic when you begin air sealing. Keep the fireplace flue damper tightly closed when not in use. 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.

Foam or caulk small gaps in your attic. 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. 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.

I am installing the chimney using a square cathedral support which doubles as an attic radiation shield.