Insulation Around Brick Chimney In Attic

It is an effective barrier to the passage of heat.

Insulation around brick chimney in attic.

Both can be added to uninsulated attics or layered over existing material. Go with a full aluminum sheath right against the chimney to serve as the air barrier and then fill in behind it with roxul or 2. Spun fiberglass insulation is like a sponge as far as its ability to collect and hold significant volume of water. In either cse it fills the required open air space around the b vent in the un conditioned attic space.

Seal between the chimney and the framing with fireblock foam or caulk to prevent exterior air from coming in and then put 3 of roxul directly against the chimney brick. Because the pipe gets hot building codes usually require 1 inch of clearance from metal lues 2 inches from masonry chimneys to any combustible material including insulation. The opening around a furnace or water heater lue or chimney can be a major source of warm air moving in the attic. Fiberglass is one of the most commonly used materials for insulating the home.

They make 4 wide blanket sized insulation for this. Insulating your crawl space walls with at least an r 19 or r 21 will go a long way. Once you ve decided which type is best for you examine the material options and prices to home in on the right product. A 2 inch board has r 13 insulation.

You will probably have to look somewhere besides the big box stores for this. If there is a straight open space accessible from above you might consider polyisocyanurate foam insulation. If the chimney is an older brick one it may be possible to insulate it along the warm side at the same time as the walls of the knee wall spaces. The b vent system requires air space clearance as well as clearance from combustibles.

Fiberglass insulation is commonly used in attics around the chimney stack. You might want to consider a wireless thermostat. In hot climates it prevents heat from outside the house entering reducing the need to use air conditioners. I think i ll either.