Gas HW Heater Exhaust Vent Caulk - HVAC - DIY Chatroom Home Improvement Forum

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Old 06-17-2009, 10:33 AM   #1
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Gas HW Heater exhaust vent caulk

I have installed a gas water heater and have a question about sealing the vent pipe. Where the vent pipe comes out the roof through a metal flashing/boot, the instructions say to apply silicone caulk around it, under the storm collar. Is there a special caulk I should use or will any exterior silicone caulk do? I'm wondering if there is a special caulk I'm supposed to use because of the heat coming up through the vent. The guys at HD didn't know and the guy at Lowe's told me to use some black roofing stuff ... I've never seen this used before on an exhaust vent, so I thought I'd ask this group. thanks


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Old 06-17-2009, 12:52 PM   #2
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Why not contact the manufacturer. You could just use high temp silicone like the type used for wood stoves. I believe HD carries it. If not, check with someone that sells wood stoves and the like.


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Old 06-17-2009, 03:39 PM   #3
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If it's not s.w. vent pipe >>> I have used 100% silicone with no problems on D.W. vent.. I like to use roofing cement in a tube
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