Insulation Around Chimney In Attic

Cut two flat sheets of aluminum flashing that are 14 inches long and narrow enough to fit between the ceiling joists around the flue.

Insulation around chimney in attic.

Due to pressure differences caused by stack e. It is an effective barrier to the passage of heat. Don t you still need a 2 clearance to combustables. Both can be added to uninsulated attics or layered over existing material.

Holes hidden in attics basements and crawlspaces are much harder to locate and usually cause bigger problems. 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. 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 either cse it fills the required open air space around the b vent in the un conditioned attic space. 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. How to insulate a metal flue pipe. 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.

The b vent system requires air space clearance as well as clearance from combustibles. Fibreglass is not considered non combustable correct. Once you ve decided which type is best for you examine the material options and prices to home in on the right product. Fiberglass insulation is commonly used in attics around the chimney stack.

Measure the circumference of the flue. Fiberglass is one of the most commonly used materials for insulating the home. In hot climates it prevents heat from outside the house entering reducing the need to use air conditioners. Turn the water heater or furnace off and allow the flue to cool to the touch.