Air Seal Attic Chimney

This isolated the masonry from an r 60 blanket of cellulose insulation that was blown in place after all the airsealing measures were implemented.

Air seal attic chimney. There will definitely not be cellulose in contact with the 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. By air sealing in your attic you can stop many major air leaks and help to maintain the desired temperature throughout your home. All you need to do is.

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. Just put it back into place. View from within attic access. Set up a cordless drill with a.

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. Air seal and insulate your chimney to save money initial state of the chimney permalink. Once the metal is in place. Once the air seal was accomplished jerome installed a roxul mineral woolinsulation barrier around the chimney.

Cut a few pieces of foam board insulation the same size and screw them to the plywood with long 4 screws. Cut a piece of plywood to the size of your attic door. Cut to the chase permalink. My natural gas furnace exhausts into a block.

Measure and cut the flashing for each side of the chimney using sheet metal cutters. 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. High temp sealant sheet metal and snips. It is essentially a sheet metal box that gets mounted into the opening through which the chimney passes.

The support maintains a 1 inch airspace between the outside of the insulated chimney and everything outside of the support. Drop the attic door over the weather. 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. Once you seal the air leak with caulk or expandable foam it s not necessary to replace the insulation.

Sealing an air leak around a chimney in the attic 1. Seal small gaps with caulk up to inch and expandable foam spray up to 3 inches. Install a piece of weather stripping around the access hole in the attic. Put on work gloves.

Combined with attic insulation air sealing can help to alleviate the formation of dangerous ice dams in the winter. Access the attic through a crawl space in the ceiling using a stepladder or use or the attic stairs.