Double check that, usually you need "Type X" 5/8" to achieve the 1 hr. rating. According to the IBC it takes two layers, staggered of 1/2" each side to get a 1 hour rating. See Item 14-1.2 in Table 719.1(2). One layer of 5/8" Type X on each side will also give 1hr, Item 14-1.3.
You will most likely be within the 15 minute window with standard 1/2" sheet rock over studs with no exposed combustibles. Make sure all penetrations into the stud cavity are sealed with fire caulk. Thermal barrier is between the bathroom and the adjacent space. Craig L. Prahl, CET Fire Protection Group Mechanical Department CH2MHILL Lockwood Greene 1500 International Drive PO Box 491, Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 [EMAIL PROTECTED] http://www.ch2m.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Eric Tysinger Sent: Friday, April 11, 2008 8:47 AM To: [email protected] Subject: RE: thermal barrier Don't forget the thermal barrier is required behind the fixtures and must extend to the floor even behind the bathtubs. If you need to prove the rating (15min) a simple spec sheet on gypsum board should provide that. Any UL fire rating details will show ½" gypsum on each side of a metal stud wall as at least one-hour. Eric Tysinger Design Manager Wayne Automatic Fire Sprinklers, Inc. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dewayne Martinez Sent: Friday, April 11, 2008 7:35 AM To: [email protected] Subject: RE: thermal barrier I believe a 1/2" sheet of gyp bd meets this criteria but you may want to show him 13R (07)6.9.2. The requirement for the thermal barrier has been removed. Dewayne -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Todd Williams - FPDC Sent: Friday, April 11, 2008 6:04 AM To: [email protected] Subject: thermal barrier NFPA 13R includes an exclusion for sprinklers in bathrooms less than 55 sqft and where the walls behind fixtures "are of non-combustible or limited combustible materials providing a 15-minute thermal barrier". Is there any way to quantify if this criteria is met? A thermal barrier to what? I have an AHJ questioning this. Todd G. Williams, PE Fire Protection Design/Consulting Stonington, Connecticut www.fpdc.com 860.535.2080 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
