Insulation Around Flue Pipe

At least you can keep air from flowing around the pipe.

Insulation around flue pipe.

I have added a picture. However the better method for filling voids in a chimney flue liner to the full height of the flue is to use vermiculite chips can be bought for insulation purposes or as soil treatment check around for best prices. Unless the manufacturer says you can pack insulation around the pipe don t. It is often installed in gaps around the chimney and flue to prevent airflow that can siphon the heat away from the interior of the building.

The pipe comes out of the wall into the garage and up to the roof. I have a fireplace insert in my basement. This makes it an ideal insulation material for use in areas that experience high temperatures. Do not use spray foam for any of the joints near a vent pipe.

Rigid insulation increases the outside diameter of the liner pipe by 1 75. I wouldn t worry much about not having a square foot of insulation here and there. The opening around a furnace or water heater flue or chimney can be a major source of warm air moving in the attic. Cut enough aluminum flashing from the roll to wrap around the vent pipe with an extra 6 inches to spare.

It was covered with blown in insulation. The gas furnace was in a garage and the flue pipe went up through the above attic. Always use fire resistant caulking. I was thinking of doing some better framing around it and maybe use rigid foam insulation but i read that building code requires a 2 gap around.

I don t know about a dryer vent but for most heaters and woodstoves it is not allowed. Fiberglass insulation is naturally fire resistant. Air traveling over the surface of the flue pipe may be required to keep it safe and cool. As such it can be used to insulate a chimney.

Because the pipe gets hot building codes usually require 1 inch of clearance from metal flues 2 inches from masonry chimneys to any combustible material including insulation. Apply a thick bead of high temperature caulk the flue on one side. You should never have insulation in contact with a wood stove flue pipe. Available in 24 lengths.

Probably a less heat loss than a window. Remove the insulation between the joists where the flue is located to clear an area about 18 inches away from the flue on each side. I am reinsulating this wall and i need some advise on how to insulate this. It had about a 5 rise from the furnace to the charred area in the attic.

Now you must form an insulation dam to prevent insulation from contacting the flue pipe. In this case the b vent was also dented on the side so i know the airspace around the double wall pipe was compromised.