| Author |
Message |
ernest campbell (Unregistered Guest)
Unregistered guest
| | Posted on Wednesday, December 17, 2014 - 08:02 pm: |    |
I am doing a major remodel of a 95 year old building,fully sprinkled,corridor walls have 5/8 typex firecode drywall finished with some wainscot installed on surface of the gypsum.
local fire inspector has required class c coating on the wood lath wainscot.
any suggestions?
is this required by the code? |
Ronald L. Geren, FCSI, AIA, CCS, CCCA, SCIP
Senior Member
Username: specman
Post Number: 1280
Registered: 03-2003
| | Posted on Thursday, December 18, 2014 - 10:11 am: | |
Ernest: See the link in my post of 2/17/11. Most corridors in a sprinklered building are permitted Class C finishes on the walls and ceilings. The link in my post is to a American Wood Council document that shows that most wood materials have a Class C rating. According to the document, all the woods listed have a smoke developed index of less than 450, so it passes the first criterion. Next, find the species that is proposed for the wainscot in the table and read the rating within the flame spread column. If it is 200 or less, then it is at least a Class C material and no treatment is required.
Otherwise, there are several products available that will provide a Class A finish to wood products.
Ron Geren, FCSI, AIA, CCS, CCCA, SCIP
www.specsandcodes.com |
Dave Metzger
Senior Member
Username: davemetzger
Post Number: 554
Registered: 07-2001
| | Posted on Thursday, December 18, 2014 - 10:21 am: | |
Ernest, by "wood lath" wainscot do you mean solid stock wood? As Ron stated, fire-retardant varnishes are available, but note that they are fairly soft finishes, and I'd be cautious about using them in locations subject to abrasion.
Alternatively, with a wood veneer panel wainscot, the flame spread rating is obtained from the substrate (fire-retardant MDF or particleboard), and the thin veneer is considered not to contribute to a fire. |
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