Air Sealing Around Chimney In Attic

It s easy to overlook electrical wires ducts pipes and vents in the attic but the openings around these are holes can compromise the air sealing of your attic.

Air sealing around chimney in attic.

Because the pipe gets hot building codes usually require 1 inch of clearance from metal flues 2 inches from masonry chimneys to any combustible material including insulation. The opening around a furnace or water heater flue is a major source of warm air into the attic photo 5. Sealing attic air leaks. Furnace flues require special sealing techniques.

Either work from the interior as walter suggests or temporarily remove the vinyl siding and j channel and work from the exterior. Air sealing the wall plate around the perimeter of your attic blocks air from escaping around the outer edges of your home. To seal these openings use caulk or spray foam. Expandable foam spray get several cans of expandable foam spray to seal larger gaps 1 4 inch to 3 inches.

From masonry chimneys to any combustible material including insulation. Access the attic through a crawl space in the ceiling using a stepladder or use or the attic stairs. Furnace flues require special sealing techniques the opening around a furnace or water heater flue or chimney can be a major source of warm air moving in the attic. If there s no wood staple it right to the drywall.

For larger holes filler material may be needed. It s usually the hardest place to air seal because the cramped space underneath the eaves where the roof rafters rest on the outer wall makes it hard to move your hands and head. As you note the chase on the attic floor is not as much of a problem because your basement and your attic are both inside of your thermal envelope. Seal fireplace and furnace holes.

Measure and cut the flashing for each side of the chimney using sheet metal cutters. Caulk gun you need a caulk gun and know how to use it in order to fill air leaks with caulk. Put on work gloves. Set up a cordless drill with a.

Air sealing the attic perimeter. Sealing an air leak around a chimney in the attic 1. The opening around a furnace or water heater lue or chimney can be a major source of warm air moving in the attic. Because the pipe gets hot building codes require 1 in.

When it comes to air sealing it isn t rocket science just ordinary crack sealing. Of clearance from class b flues 2 in.