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shawdog2 Participant Join Date: Jun 2009 Posts: 2	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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Guest	#1 Re: Calculate wall fire resistance 11/04/2009 1:46 PM
	http://ulstandardsinfonet.ul.com/scopes/0263.html

ozzb Guru Join Date: Mar 2007 Location: Rosedale, Maryland USA Posts: 1853 Good Answers: 54	#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!"

Doorman Power-User Join Date: Apr 2009 Location: Fargo, America Posts: 143 Good Answers: 5	#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. __________________ " I ain't no physcikisk, but I knows what matters." Popeye the Sailor

bwire Guru Join Date: Dec 2007 Location: Upper Mid-west USA Posts: 5517 Good Answers: 53	#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 __________________ "In a time of drastic change it is the learners who inherit the future. The learned usually find themselves equipped to live in a world that no longer exists."Eric Hoffer"

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