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.

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. In either cse it fills the required open air space around the b vent in the un conditioned attic space. Due to pressure differences caused by stack e.

For diy attic insulation you ve got two choices. Measure the circumference of the flue. Fibreglass is not considered non combustable correct. You can wrap the masonry with a 3 5 fiberglass batt and then blow cellulose up to the batts.

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. In hot climates it prevents heat from outside the house entering reducing the need to use air conditioners. The b vent system requires air space clearance as well as clearance from combustibles. 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.

How to insulate a metal flue pipe. Fiberglass insulation is commonly used in attics around the chimney stack. Don t you still need a 2 clearance to combustables. 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. Loose fill or batt the common term for blanket insulation. Once you ve decided which type is best for you examine the material options and prices to home in on the right product. It is an effective barrier to the passage of heat.