Answer to Question 1: I would also say it is the assembly. Else, gypsum sheets (drywall) wrapped around wood members will not be acceptable.
Answer to Question 2: 13, 2007 handbook has the follwing commentary: "......it is important To verify that the testing used to determine the material's combustibility was conducted with the material arranged in the position in which it is to be installed. Changes in the orientation or arrangement of the material can sinificantly change the flamespread characteristics and the combustibility of the material." The commentary seems to imply that it is the orientation. Tony -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Roland Huggins Sent: December 21, 2010 11:33 AM To: [email protected] Subject: Re: Fire Retardant Coating Question 1: No-Burn has a ton of supporting material and seems a readily accomplishable task for an equivalency. They also references 8.15.1.2.10 in their material. That raises a question of interpretation though. Where it says "rigid materials are used", does that mean the final assembly is rigid or the material providing the low flame spread is rigid (like gypsum). I've always interpreted it as the latter but this has been in the standard a long time so I can't say what the ORIGINAL intent was. I would have to say that a literal application of the text can mean the assembly. The current TC needs to decide what they think it means and clarify it. Question 2: The "form in which they are installed" is not the orientation of installation. Considering it is a compilation of materials, they must be tested in the arrangement they are installed. For instance, is the rigid foam sandwiched between layers of gypsum or is it an exterior membrane? Roland On Dec 21, 2010, at 10:11 AM, A.P.Silva wrote: > Cost is not a factor, at least for now. 13 has specific requirements > in 8.15.1.2.10. Are there any paints that satisfy these requirements. > Would > appreciate to get names of any products. > > Many claim their paints are UL listed as fire retardants, but 13 has > more specific requirements. > > If anyone is familiar with this section of the code, have another > question. > NFPA 13, 2010; 8.15.1.2.10 ".......extended for additional 20 minutes > in the form in which they are installed, shall not require sprinkler > protection". > "In the form in which they are installed" must mean the material > arranged in the way it is installed. So for an engineered wood truss > it must mean OSB at different slopes. However, the ASTM E84 test > specified by NFPA has the material in horizontal position. Does anyone > know what is meant? > > Tony > _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
