Air Seal Attic Chimney

By air sealing in your attic you can stop many major air leaks and help to maintain the desired temperature throughout your home.

Air seal attic chimney.

All you need to do is. It is essentially a sheet metal box that gets mounted into the opening through which the chimney passes. 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. Measure and cut the flashing for each side of the chimney using sheet metal cutters.

Sealing an air leak around a chimney in the attic 1. Access the attic through a crawl space in the ceiling using a stepladder or use or the attic stairs. High temp sealant sheet metal and snips. Drop the attic door over the weather.

Cut to the chase permalink. Air seal and insulate your chimney to save money initial state of the chimney permalink. 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. This is a result of moist air leaking into your attic and then freezing when it hits your cold attic.

Pressurize your house once you re ready place a box fan in a window so it s blowing air into the house and close all the remaining windows and doors. Locate the main plumbing stack furnace flue or chimney and note this on your sketch for a reference point once you get into the attic. Just put it back into place. Put on work gloves.

Fireplace flues are made from metal and over time repeated heating and cooling can cause the metal to warp or break creating a channel for air loss. Use the sheet metal to completely cover the chase. This isolated the masonry from an r 60 blanket of cellulose insulation that was blown in place after all the airsealing measures were implemented. Seal small gaps with caulk up to inch and expandable foam spray up to 3 inches.

My natural gas furnace exhausts into a block. Install a piece of weather stripping around the access hole in the attic. View from within attic access. Cut a piece of plywood to the size of your attic door.

Compare with other projects. Set up a cordless drill with a. There will definitely not be cellulose in contact with the chimney. The support maintains a 1 inch airspace between the outside of the insulated chimney and everything outside of the support.

Combined with attic insulation air sealing can help to alleviate the formation of dangerous ice dams in the winter. Once the air seal was accomplished jerome installed a roxul mineral woolinsulation barrier around the chimney.