International Association of Certified Home Inspectors|
#1
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Does this application still require a 1" clearance from combustibles?
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#2
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If that's sheetrock, then it isn't "combustible" and there is no issue. Isn't sheetrock used to provide a fire barrier between the garage and home?
However, if that is a garage, then there is void in the fire barrier. The gap should be protected by a flange to prevent flame entry into the structure above the ceiling. Joe Funderburk, CMI Alpha & Omega Home Inspections, LLC Inspecting Upstate SC & Charlotte Metro, NC NACHI ID: NACHI05120170 www.aohomeinspection.com |
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#3
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B Vent manufacturers will disagree and tell that a 1" clearance is required.
Quote:
Quote:
http://www.americanmetalproducts.com...rivent/faq.htm "Never ever threaten anyone in Camoflage" Tim Wilson "Not everyone follows the same path" Governor Sanford, musings on the Appalachian Trail
Last edited by bkelly2; 9/25/09 at 1:37 AM.. |
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#4
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I think the difference is due to the different purposes. One is with performance under the conditions during a fire (where it is considered noncombustible), and another is with performance during exposure to a constant high-heat source (where it is considered combustible).
Correct? |
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#5
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Quote:
It is "fire-resistant", not "fire-proof" Decent article... http://www.homeadditionplus.com/dryw...ed-Drywall.htm Owl Home Inspections Rick Maday Itasca, IL Home Inspector Serving all Chicago Suburbs Schaumburg Home Inspector Naperville Home Inspector Lake County Home Inspector
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#6
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Once again, it has nothing to do with drywall manufacturer, it has to due with what the Manufacturer recommends for the installation of their product. And how the product was tested by whatever agency validates the safety performance of the rpoduct(UL).
The dryall manufacturer can say whatever they want about their product............. Pyrolysis is also taken into consideration..................................... ..... "Never ever threaten anyone in Camoflage" Tim Wilson "Not everyone follows the same path" Governor Sanford, musings on the Appalachian Trail
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#7
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Anyone know of a single problem caused in not having clearance?
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#8
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Many fires in the north from pipes too close to combustibles. Watch the news this heating season or check with your fire department if need be for verification.
____________________________________________ "An Education, not just an Inspection" Larry Kage Lake Ann (Traverse City), Michigan 49650 231 929 3525 Professional Inspector and Infrared Thermographer serving the Traverse City, Michigan area and beyond. ITC/FLIR CERTIFIED BUILDING SCIENCES THERMOGRAPHER ITC/FLIR CERTIFIED LEVEL 1 THERMOGRAPHER
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#9
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Brian,
Don't you have to have an absence of oxygen to be called pyrolysis? No, I haven't seen or heard of a problem with a smaller that 1'' clearance but still call it out. |
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#10
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Thanks, but did they blame the drywall clearance?.
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#11
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Here is a picture of drywall in an interior utility closet that didn't 'burn' under pretty much worst case scenario with a flue! I ran into this a few years ago. I think someone made a boo boo when they were re-roofing.
"An expert is a person who has made all the mistakes that can be made in a very narrow field" Niels Bohr "Learn all you can from the mistakes of others. You won't have time to make them all yourself" Alfred Sheinwold Eureka, Fortuna & Arcata, CA
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#12
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Think I need to get a propane torch and see what happens , though I seem to recall a discussion here in the past about materials becoming more flammable over time when exposed to heat .
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#13
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Read all of this and pay particular attention to the last paragraph. Provided Larry's information is correct, drywall is considered non-combustible by 3 national model building codes, I don't care what the b-vent manufacturer's say about it.
http://www.nachi.org/forum/f22/b-ven...34/#post543528 Joe Funderburk, CMI Alpha & Omega Home Inspections, LLC Inspecting Upstate SC & Charlotte Metro, NC NACHI ID: NACHI05120170 www.aohomeinspection.com |
| Find an InterNACHI certified Kentucky Home Inspector (and anywhere else in North America) |
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#14
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Remember to pay attention to whether there is wood behind the drywall within these clearance distance situations...
____________________________________________ "An Education, not just an Inspection" Larry Kage Lake Ann (Traverse City), Michigan 49650 231 929 3525 Professional Inspector and Infrared Thermographer serving the Traverse City, Michigan area and beyond. ITC/FLIR CERTIFIED BUILDING SCIENCES THERMOGRAPHER ITC/FLIR CERTIFIED LEVEL 1 THERMOGRAPHER
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#15
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Quote:
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