What is the difference between the sprinkler deflector and top of slat
elevations?
J. Scott Mitchell, PE
Fire Protection Engineer |
Projects Engineering
CNS Pantex | 806.477.5883 |
-----Original Message-----
From: Sprinklerforum [mailto:[email protected]] On
Behalf Of Greg McGahan
Sent: Wednesday, August 19, 2015 8:54 AM
To: [email protected]
Subject: Re: slatted ceiling
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?
>
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