Insulation Around Brick Chimney In Attic

The b vent system requires air space clearance as well as clearance from combustibles.

Insulation around brick chimney in attic.

In hot climates it prevents heat from outside the house entering reducing the need to use air conditioners. In either cse it fills the required open air space around the b vent in the un conditioned attic space. It may be easier to use rigid foam insulation than. 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.

It is an effective barrier to the passage of heat. Both can be added to uninsulated attics or layered over existing material. Fiberglass is one of the most commonly used materials for insulating the home. Loose fill or batt the common term for blanket insulation.

The opening around a furnace or water heater lue or chimney can be a major source of warm air moving in the attic. They make 4 wide blanket sized insulation for this. I think i ll either. 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.

Insulating your crawl space walls with at least an r 19 or r 21 will go a long way. 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. If there is a straight open space accessible from above you might consider polyisocyanurate foam insulation. Fiberglass insulation is commonly used in attics around the chimney stack.

A 2 inch board has r 13 insulation. Spun fiberglass insulation is like a sponge as far as its ability to collect and hold significant volume of water. For diy attic insulation you ve got two choices. 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.