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7 post(s) First 1 Last
is drywall combustable?
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Re: is drywall combustable? By  cda

Posts: 0

8/25/2005 2:09:00 PM

yes it will burn but what is your real question??????????????


Re: is drywall combustable? By  THECODEGEEK

Posts: 0

8/25/2005 2:18:00 PM

is it classified as combustable material in reference to clearances from type b vents?
I realize gypsum is not , but is the paper combustable therefore requiring clearances?
I have always been told that 6'''' clearance is required from single wall b vent to combustables..........is drywall combustable?
im question this call in the feild.


Re: is drywall combustable? By  DMessler

Posts: 0

8/25/2005 3:50:00 PM

1" clearance to drywall that is why there is a collar that goes around the vent at the ceiling location with a 1" clearance collar and will meet the requirements for U to attic etc.


Re: is drywall combustable? By  dsjtecserv

Posts: 0

8/26/2005 5:44:00 AM

Yes, for purposes of determining clearances from chimneys, vents, and heating equipment, drywall is considered combustible. Type B vent is a listed product, and must be installed at the clearance specified by the manfuacturer''s instructions and the label on the pipe. Typically, but not always, this is 1 inch. The 6 inches you reference is from single wall vent connectors (not Type B vents) to combustible construction, including drywall.


Re: is drywall combustable? By  Dr. J

Posts: 0

8/26/2005 1:10:00 PM

The IBC considers Gyp Bd to be non combustible. This is because the IBC allows a material whose core passes the ASTM E136 test, with only a thin facing that does not to still be considered non-combustible.

Per the IMC (which is where clearances are discussed), the whole sample must pass ASTM E136. The paper facing on gyp bd flames, and therefore does not pass.


Re: is drywall combustable? By  ba109

Posts: 0

8/26/2005 3:06:00 PM

I agree with the Dr.

See IBC 703.4.2.


Re: is drywall combustable? By  peach!!

Posts: 0

8/26/2005 6:05:00 PM

gyp board is combustible in that it is paper faced.. the gypsum won''t burn .. it''s a mineral.. but the paper is always an issue.. high rise shaft liners are usually gyp board (thick).. HOWEVER.. most UL listings don''t say (remember the 5/8" type x has paper on it).. it''s considered in the testing..hope that helps


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