flue question.
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Hotshot
Joined: Apr 2004
Posts: 13,589
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From: NW burbs of chicago
flue question.
the exhaust tubes for my water heater and furnace go into my chimney flue, but they arn't "sealed" in there, should they be sealed with some sort of masonry caulk?
Logistics Pro
Joined: Nov 2004
Posts: 3,550
Likes: 5
From: Lancaster County PA
I believe no sealant is necessary. The hot flue gas rises right past the openings.
I don't have any gas fired appliances, but I do have a woodstove and none of those joints are sealed.
On retrospect, I do have an oilf fired burner in the basement (haven't used it in years) and those flue joints aren't sealed at all either.
I don't have any gas fired appliances, but I do have a woodstove and none of those joints are sealed.
On retrospect, I do have an oilf fired burner in the basement (haven't used it in years) and those flue joints aren't sealed at all either.
Cargo Master
Joined: Apr 2003
Posts: 3,476
Likes: 224
From: Frequently frozen MN
There is ( or used to be ) some stuff called furnace cement that would probably work. We had a coal to gas conversion when I lived at home, and they sealed the furnace up with that. It wore out after 20 years or so, and I was able to locate some and reseal things. I would think that it would stick to the metal and the cement, plus it can take the heat ( not much in a gas setup).
Otherwise there's high temp duct tape, but I don't know if that sticks to cement.
Otherwise there's high temp duct tape, but I don't know if that sticks to cement.
Posting Guru
Joined: Sep 2002
Posts: 2,420
Likes: 3
From: Langhorne, PA
Not necessary to seal them, the hot gas goes out quickly.
I had a chimney man come to my house because my oil burner flue kept dropping soot all over my washing machine. He applied some sort of gray mortar compound around the joints, and it stopped the soot falling for a short time. However, the mortar became hard and brittle, and started falling down onto my washing machine and was letting the soot come out again.
Bottom line...I rebuilt the flue my self with the correct pipes and adaptors and the problem is fixed. I used three metal screws at each joint and the problem is gone.
If you invest any money at all, consider buying a carbon monoxide detector.
These things will save your butt!
An old man I know died because an animal built a nest in his flue, restricted the pipe, and the CO killed the old-timer in his own house.
I had a chimney man come to my house because my oil burner flue kept dropping soot all over my washing machine. He applied some sort of gray mortar compound around the joints, and it stopped the soot falling for a short time. However, the mortar became hard and brittle, and started falling down onto my washing machine and was letting the soot come out again.
Bottom line...I rebuilt the flue my self with the correct pipes and adaptors and the problem is fixed. I used three metal screws at each joint and the problem is gone.
If you invest any money at all, consider buying a carbon monoxide detector.
These things will save your butt!
An old man I know died because an animal built a nest in his flue, restricted the pipe, and the CO killed the old-timer in his own house.
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Nov 5, 2005 12:31 PM
