I just visited the site to see what is going on. It is not a slatted
ceiling.
There are several slatted ceiling clouds. 6' x 6'; 50% openings; 6" open
space
on all 4 sides; 3/4 x 2-1/4 boards on edge; in pre assembled sections. This
is a
change in the project to the point where they hung the slat sections to the
original ceiling grid.
Interesting how contractors sometimes skew the descriptions.
Todd G Williams, PE
Fire Protection Design/Consulting
Stonington, CT
www.fpdc.com
860-535-2080 (ofc)
860-608-4559 (cell)
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On Wed, Aug 19, 2015 at 10:52 AM, [email protected]
<[email protected]> wrote:
There seems to be a conception that sprinklers require direct impingement
to operate. If this were the case we'd need to put them much closer
together. Like Scott I'm thinking the distance below the true ceiling above
the slats and the distance below the slats are the significant factors. In
fact if the slats are close enough together a thermal barrier at that level
is likely and heat will be trapped there. This corridor is only ten feet
wide. I think I'd run a single row of ECs down the center of one soffit
depending on the distance below the true ceiling.
On Wed, Aug 19, 2015 at 6:53 AM, Greg McGahan <[email protected]>
wrote:
> Tim,
>
> I respectfully disagree. If the wood slats comply with the description
> below then I believe it is the closest reference we have to this
situation.
> In our case the depth exceeded the width of the opening so we put
> sprinklers above the slats. Our ceiling was 1 x 6's turned vertical on
edge
> and spaced 5" center to center. That seemed like it would be a
significant
> disruption of the spray pattern and the Engineer agreed...
>
>
> Open-grid ceilings in which the openings are 1/4 in. (6.4 mm) or larger
in
> the least dimension, where the thickness or depth of the material does
not
> exceed the least dimension of the opening, and where such openings
> constitute 70 percent of the area of the ceiling material. The spacing
of
> the sprinklers over the open-grid ceiling shall then comply with the
> following:
>
>
> Greg McGahan
> Living Water Fire Protection, LLC <http://www.livingwaterfp.com>
> 1160 McKenzie Road
> Cantonment, FL 32533
> 850-937-1850
> fax 850-937-1852
>
> On Wed, Aug 19, 2015 at 8:41 AM, Tim Stone <[email protected]> wrote:
>
> > Todd,
> >
> > I don't believe Open Grid Ceiling rules will apply. The material can't
be
> > any thicker than the least dimension of the opening.
> > If it is a wood frame material like 2x solid wood then you will have
an
> > obstruction to spray pattern to worry about. Once you get all the
> > information on the slatted ceiling solutions will be easier.
> >
> > Regards,
> > G. Tim Stone
> >
> > G. Tim Stone Consulting, LLC
> > NICET Level III Engineering Technician
> > Fire Protection Sprinkler Design
> > and Consulting Services
> >
> > 117 Old Stage Rd. - Essex Jct., VT. 05452
> > CELL: (802) 373-0638 TEL: (802) 434-2968 Fax: (802) 434-4343
> > [email protected]
> >
> > -----Original Message-----
> > From: Sprinklerforum [mailto:
> > [email protected]]
> > On Behalf Of Todd - Work
> > Sent: Wednesday, August 19, 2015 8:10 AM
> > To: [email protected]
> > Subject: slatted ceiling
> >
> > I am working on a project with a slatted ceiling in a wide corridor.
The
> > ceiling construction is a fire rated wood and is considered non
> > conbustible.
> > There is a 2' wide sheetrock soffit around the perimeter and the
slatted
> > area is approximately 6 ft wide down the middle. The space above the
> > ceiling
> > is non combustible and would not normally require sprinklers. The FM
has
> > raised a question if sprinklers below would operate given the openings
(I
> > am
> > trying to get the dimensions of the openings and the slats). I did not
> see
> > anything in 13 addresses this. Am I missing something? Thoughts?
> >
> > Sent using CloudMagic
> > [https://cloudmagic.com/k/d/mailapp?ct=ti&cv=6.0.64&pv=8.2]
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--
Ron Greenman
Instructor
Fire Protection Engineering Technology
Bates Technical College
1101 So. Yakima Ave.
Tacoma, WA 98405
[email protected]
http://www.bates.ctc.edu/fireprotection/
253.680.7346
253.576.9700 (cell)
Member:
ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC, WFSC
They are happy men whose natures sort with their vocations. -Francis Bacon,
essayist, philosopher, and statesman (1561-1626)
A problem well stated is a problem half solved. -Charles F. Kettering,
inventor and engineer (1876-1958)
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