Air Seal Attic Chimney

Install a piece of weather stripping around the access hole in the attic.

Air seal attic chimney. High temp sealant sheet metal and snips. Set up a cordless drill with a. Measure and cut the flashing for each side of the chimney using sheet metal cutters. All you need to do is.

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. Put on work gloves. Just put it back into place. It is essentially a sheet metal box that gets mounted into the opening through which the chimney passes.

Cut a piece of plywood to the size of your attic door. Combined with attic insulation air sealing can help to alleviate the formation of dangerous ice dams in the winter. Cut to the chase permalink. Once you seal the air leak with caulk or expandable foam it s not necessary to replace the insulation.

Cut a few pieces of foam board insulation the same size and screw them to the plywood with long 4 screws. By air sealing in your attic you can stop many major air leaks and help to maintain the desired temperature throughout your home. Drop the attic door over the weather. 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.

Seal small gaps with caulk up to inch and expandable foam spray up to 3 inches. The support maintains a 1 inch airspace between the outside of the insulated chimney and everything outside of the support. Once the metal is in place. Air seal and insulate your chimney to save money initial state of the chimney permalink.

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. 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. 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.

There will definitely not be cellulose in contact with the chimney. Compare with other projects. Use the sheet metal to completely cover the chase. This is a result of moist air leaking into your attic and then freezing when it hits your cold attic.

My natural gas furnace exhausts into a block. 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.