Drywalling around a gas water heater pipe

I am installing (green) drywall in a room that has a gas water heater vented to the outside through a 6" wall. It has a large metal escutcheon ring around a metal exhaust pipe. The exhaust pipe has an interior exhaust surrounded by a fresh intake jacket. The pipe gets warm. Currently there is (no paper) fiberglass insulation. Do I drywall leaving a large gap around the pipe? Great Stuff expanding foam? I want this job to look good with safety in mind.
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Phisherman wrote:

I'd just fit around the exhaust reasonably closely and use the escutcheon or another one that's more in fitting the decor (if a room containing the water heater can be said to have "decor" :) ) if that's an issue...
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On Fri, 11 Jul 2008 10:49:23 -0400, Phisherman wrote:

Aren't there zero clearance flanges for vent pipes? If in doubt, leave space and use a decorative metal flange to cover gap.
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Franz Fripplfrappl
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Phisherman wrote:

Are you sure it gets warm?
Gas water heater vent pipes usually are double walled - the gap acting as a heat barrier.
Nevertheless, sheetrock won't burn (note the "rock" part of the name). The paper covering it might char, but it really won't burn either.
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Get from your municipal building permits office the standard specifications for installing a gas heater. You will not need a permit because you are not installing a new fixture, but those two or three pages of the building code will tell you safe clearances for various types of interior or finishing wall.
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Don Phillipson
Carlsbad Springs
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wrote:

Followup... I temporarily shut off the heater and removed the pipes. I cut the hole such that a 1" clearance is around the pipe. The escutcheon ring covered the gap and fastens to the drywall. Took a couple hours but finally it's done. Thanks for all the responses.
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