The GC figures he can pack a lot of mineral wool
for the price of 90+ sprinklers
At 04:06 PM 4/11/2008, you wrote:
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
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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Stonington, Connecticut
www.fpdc.com
860.535.2080
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