Insulation Around Chimney In Attic

You can insulate around masonry chimneys after airsealing with mineral or fiberglass batts no foam or cellulose directly against the chimney.

Insulation around chimney in attic.

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. Due to pressure differences caused by stack e. For diy attic insulation you ve got two choices. Fibreglass is not considered non combustable correct.

It is an effective barrier to the passage of heat. Measure the circumference of the flue. Loose fill or batt the common term for blanket insulation. You can wrap the masonry with a 3 5 fiberglass batt and then blow cellulose up to the batts.

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. Once you ve decided which type is best for you examine the material options and prices to home in on the right product. Both can be added to uninsulated attics or layered over existing material.

Cut two flat sheets of aluminum flashing that are 14 inches long and narrow enough to fit between the ceiling joists around the flue. Holes hidden in attics basements and crawlspaces are much harder to locate and usually cause bigger problems. Spun fiberglass insulation is like a sponge as far as its ability to collect and hold significant volume of water. Don t you still need a 2 clearance to combustables.

In either cse it fills the required open air space around the b vent in the un conditioned attic space. In hot climates it prevents heat from outside the house entering reducing the need to use air conditioners. Fiberglass is one of the most commonly used materials for insulating the home. After the air sealing work was complete including wiring vent and plumbing penetrations throughout the attic the attic received an r 60 blanket of blown cellulose insulation.