Todd, Without sounding smug, wouldn't it be easier to install the sprinkler ?
John Drucker Fire Protection Subcode Official (AHJ) -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Todd Williams - FPDC Sent: Friday, April 11, 2008 3:40 PM To: [email protected] Subject: RE: thermal barrier Do thermal barrier and fire resistance mean the same thing? You could put sheet metal on metal studs and it would be a non-combustible construction would have a certain resistance, but would not be a thermal barrier. The definition in NFPA 13R give a certain definition to thermal barrier and the handbook commentary gives notes basically what several people have said. However, my situation is a little more complicated (are you surprised?) What I am working on is a 90-unit wood frame hotel with a 13R system. The original design had a modular bathroom, which has been scrapped in favor of a stick-built one. The way this is framed, a layer of sheetrock cannot be installed behind the front and back of the tub (the side along the back wall can be). The proposal has been made to fill the void space behind the cast-iron tub with mineral wool. My question is does this provide the required thermal barrier and how would I go about proving it? At 09:14 AM 4/11/2008, you wrote: >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) 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) CONFIDENTIAL AND PROPRIETARY: This email message is intended only for the use of the individual or entity to which it is addressed and may contain information that is privileged and confidential, nor is it, unless specifically stated, intended to be relied upon by any person or persons other than the individual or entity named above and no warranties or representations are made or intended to persons or entities not named above. If the reader is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. 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