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Old 03-26-2015, 10:51 AM   #1
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How to Vapour Barrier Around Heater Flue


Hi There,

Continuing my garage renovation...almost done insulating and ready to start vapour barrier.

I have a old gas heater in the garage, with an exhaust flue that runs out through the ceiling. Running into a few problems...

1) I wanted to replace the exhaust piping. The flue 'stack' is a double walled 5" pipe. I can not find double walled 5" pipe to connect the heater exhaust to the flue stack. Is it okay to run single wall galvanized vent piping to the stack .. even though it will run through the new ceiling and insulation before it connects to the double walled stack at the roof line?

2) I was planning on leaving some space around the exhaust piping in the drywall and the insulation (for fire protection) .. but this leaves a space around the piping as it goes through the ceiling, how can you vapour barrier right up to the vent? Poly I assume would just melt.

In Alberta, Canada for code related issues.

Any advice?

JA Boomer

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Last edited by JA Boomer; 03-26-2015 at 11:16 AM.
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Old 03-26-2015, 04:23 PM   #2
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How to Vapour Barrier Around Heater Flue


Don't alter the venting without checking with a gas fitter - it probably needs to be double walled.

B-vents i've seen say 1" clearance all around right on them. You can use high temperature silicone around exhaust pipes and chimneys.


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Old 03-26-2015, 04:27 PM   #3
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How to Vapour Barrier Around Heater Flue


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Originally Posted by user_12345a View Post
Don't alter the venting without checking with a gas fitter - it probably needs to be double walled.

B-vents i've seen say 1" clearance all around right on them. You can use high temperature silicone around exhaust pipes and chimneys.
Well I had to move the heater slightly and the existing exhaust piping will no longer hook up - it was super old and not connected properly anyways.

So I've got to replace it. I'd happily use double walled piping if I could find it...
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Old 03-26-2015, 05:13 PM   #4
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How to Vapour Barrier Around Heater Flue


Can't speak for Canadian code. But down here, you would need 6" of clearance for a single wall pipe. So a 5" pipe would require a 17" round hole in the ceiling.
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Old 03-27-2015, 07:12 PM   #5
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How to Vapour Barrier Around Heater Flue


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Can't speak for Canadian code. But down here, you would need 6" of clearance for a single wall pipe. So a 5" pipe would require a 17" round hole in the ceiling.

Same up here 6" clearance to combustible for single wall venting
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