Air Seal Attic Chimney

Sealing an air leak around a chimney in the attic 1.

Air seal attic chimney.

Compare with other projects. High temp sealant sheet metal and snips. 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. 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.

By air sealing in your attic you can stop many major air leaks and help to maintain the desired temperature throughout your home. View from within attic access. Set up a cordless drill with a. Once you seal the air leak with caulk or expandable foam it s not necessary to replace the insulation.

Once the metal is in place. Drop the attic door over the weather. Use the sheet metal to completely cover the chase. Seal small gaps with caulk up to inch and expandable foam spray up to 3 inches.

Cut a piece of plywood to the size of your attic door. Access the attic through a crawl space in the ceiling using a stepladder or use or the attic stairs. Combined with attic insulation air sealing can help to alleviate the formation of dangerous ice dams in the winter. The support maintains a 1 inch airspace between the outside of the insulated chimney and everything outside of the support.

Install a piece of weather stripping around the access hole in the attic. Put on work gloves. 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.

Cut to the chase permalink. Air seal and insulate your chimney to save money initial state of the chimney permalink. All you need to do is. My natural gas furnace exhausts into a block.

It is essentially a sheet metal box that gets mounted into the opening through which the chimney passes. This isolated the masonry from an r 60 blanket of cellulose insulation that was blown in place after all the airsealing measures were implemented. 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. This is a result of moist air leaking into your attic and then freezing when it hits your cold attic.

Cut a few pieces of foam board insulation the same size and screw them to the plywood with long 4 screws. There will definitely not be cellulose in contact with the chimney.