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Exhaust vent termination req for gas water heater  XML
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Kris Svendsen
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Joined: 06/22/2014 08:52 PM EDT
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Location: Dallas, TX
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I'm having trouble locating the information on the termination req for gas water heater? This one seems pretty close to surrounding material. So far I've only found "according to manufacturers recommended installation instruction". Does anyone have more info?
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Kris Svendsen
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advanced
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Joined: 02/10/2015 04:29 PM EST
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Location: Greenville SC
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I believe the same rules apply to any gas b vented appliance under 12in diameter, obviously under the current scenario backdrafting can occur,
Table of Type B-Vent Rooftop Clearance Requirements

Vent caps larger than 12" must be located at least 2 feet above the highest point and 2 feet higher than any portion of the building within a horizontal distance of 10 feet.

Vent caps 12" and smaller may terminate a distance above the roof if 8 feet or more away from a vertical surface as follows:
Roof Pitch: rise/run in inches Minimum feet above roof surface
Flat to 7/12 1.0 foot above the roof surface
7/12 to 8/12 1.5 feet above the roof surface
8/12 to 9/12 2.0 feet above the roof surface
9/12 to 10/12 2.5 feet above the roof surface
10/12 to 11/12 3.25 feet above the roof surface
11/12 to 12/12 4.0 feet above the roof surface * Continues to 21/12 pitch at 8.0 feet


Stuart Malamut


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Pete Campbell
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Joined: 06/18/2014 10:55 PM EDT
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That's a new cap on an old vent pipe. Kris, did the vent pipe inside the house below the roof look properly located or maybe a homeowner retrofit?

The house does not look too old.

Pete Campbell
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Inspecting Fort Pierce, St. Lucie Village, Lakewood Park, Vero Beach, Indian River Shores, Sebastian, Fellsmere, Fort Drum, Okeechobee, Jensen Beach, Stuart, Palm City, Hobe Sound and Indiantown, Florida.

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Mike Casey
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Joined: 06/28/2014 07:21 PM EDT
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IRC 2427.8.4. If there is any vertical surface within 8-feet the B-vent should be 2 feet higher than any part of the building within 10-feet. So it looks incorrect.

Thanks!

Mike Casey
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