Insulation Around Chimney In Attic

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.

Insulation around chimney in attic.

Furnace flues require special sealing techniques the opening around a furnace or water heater lue or chimney can be a major source of warm air moving in the attic. You can insulate around masonry chimneys after airsealing with mineral or fiberglass batts no foam or cellulose directly against the chimney. How to insulate a metal flue pipe. Fiberglass insulation is commonly used in attics around the chimney stack.

Both can be added to uninsulated attics or layered over existing material. 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. For diy attic insulation you ve got two choices.

Measure the circumference of the flue. Due to pressure differences caused by stack e. In either cse it fills the required open air space around the b vent in the un conditioned attic space. Spun fiberglass insulation is like a sponge as far as its ability to collect and hold significant volume of water.

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. Don t you still need a 2 clearance to combustables.

Fibreglass is not considered non combustable correct. Turn the water heater or furnace off and allow the flue to cool to the touch. Cut two flat sheets of aluminum flashing that are 14 inches long and narrow enough to fit between the ceiling joists around the flue. Fiberglass is one of the most commonly used materials for insulating the home.