This is not a fire rating, but a thermal barrier.
The question as I see it is would the mineral
wool provide the thermal barrier? The R value
(thermal resistance) for 1/2" sheetrock is 0.30.
The R values for mineral wool is 3.7 per inch.
The thickness if the wool will be 3/4" or
greater. So my thought is that it would meet the
criteria. Am I out of line here?
At 04:35 PM 4/11/2008, you wrote:
Todd,
I think the stud faces, if wood, would be at least one reason this
wouldn't work.
On Fri, Apr 11, 2008 at 1:31 PM, Todd Williams - FPDC <[EMAIL PROTECTED]> wrote:
> 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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> Todd G. Williams, PE
> Fire Protection Design/Consulting
> Stonington, Connecticut
> www.fpdc.com
> 860.535.2080 _______________________________________________
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--
Ron Greenman
at home....
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Stonington, Connecticut
www.fpdc.com
860.535.2080
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