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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