Calculating Fire Wall Resistance - CR4 Discussion Thread

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shawdog2 Active Contributor Join Date: Jun 2009 Posts: 14	Calculating Fire Wall Resistance 11/04/2009 1:41 PM
	How do I calculate the fire rating of an existing wall? The wall consists of 2x6 studs with insulation. On one side is 1" of sheetrock. On the other side is 1-1/4" of wood siding with 3/4" plaster over it. This produces an overall wall width of 8-1/2". I need a two-hour minimum fire rated wall. The sheetrock gives 40 minutes, and the plaster 50 minutes.
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Anonymous Poster	#1 Re: Calculate wall fire resistance 11/04/2009 1:46 PM
	http://ulstandardsinfonet.ul.com/scopes/0263.html
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ozzb Guru Join Date: Mar 2007 Location: Rosedale, Maryland USA Posts: 5198 Good Answers: 266	#3 In reply to #1 Re: Calculate wall fire resistance 11/04/2009 1:53 PM
	http://www.awc.org/Publications/dca/dca3/index.html#Table2 __________________ Life is not a journey to the grave with the intention of arriving in a pretty, pristine body but rather to come sliding in sideways, all used up and exclaiming, "Wow, what a ride!"
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Doorman Guru Join Date: Apr 2009 Location: Yellowstone Valley, in Big Sky Country Posts: 7136 Good Answers: 290	#2 Re: Calculate wall fire resistance 11/04/2009 1:50 PM
	One could pore over the UBC and IBC tables for a considerable time, and you would not find that particular construction listed as a fire resistive barrier. In other words, that construction is not a 'Fire Wall'. post script: "Sheetrock" is a registered trademark of the United States Gypsum Corporation. Generic term for the product is Gypsum Drywall or Wallboard. Sheetrock is a generic term often used (compare with 'Kleenex') to represent the material, but USG is known for vigorous protection of their trademark. __________________ When you come to a fork in the road, take it. (Yogiism)
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bwire Guru Join Date: Dec 2007 Location: Upper Mid-west USA Posts: 7498 Good Answers: 96	#4 Re: Calculating Fire Wall Resistance 11/04/2009 11:58 PM
	two hour firewall or dbl layer of 5/8" type "X" drywall screwed to studs and tape/mudded __________________ If death came with a warning there would be a whole lot less of it.
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Anonymous Poster (1); bwire (1); Doorman (1); ozzb (1)

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