John,
I found a definition in FM data Sheet 2-0, 2.2.3.4.2
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: [email protected]
> [mailto:[email protected]] On Behalf Of John
F
> Hoffman
> Sent: Thursday, March 13, 2014 3:02 PM
> To: [email protected]
> Subject: RE: Warehouse Ceiling Question?
>
> I am not seeing anything in NFPA 13 that says this. Maybe just missing
it,
> but the definition of ceiling height (2013 edition) is 3.3.3. and just
> mentions "to the underside of the ceiling or roof deck".
>
> If you look at one mfrs spec sheet for k25 ESFR here is what it says.
>
> NFPA 13 Deflector-to-Ceiling
> Distance
> 6 to 18 inches (152 to 457 mm)
> FM 2-0
> Consult FM and/or FM Guidelines for allowable deflector-to-ceiling
> distances as well as thermal sensing element-to-ceiling criteria.
>
> Note that FM uses the centerline of the thermal sensing element and NOT
the
> deflector. Plus they talk about (somewhere) the width, and maybe the
> height of the metal deck pockets and give criteria of where to measure
from
> - top or bottom.
>
> John Hoffman
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Bob
> Sent: Thursday, March 13, 2014 1:40 PM
> To: [email protected]
> Subject: RE: Warehouse Ceiling Question?
>
> I think 13 addresses this with 3" and less deep the bottom is the deck, if
> greater than 3" than the upper part of the channel is the deck. Sorry I
> don't have time to look up code, but you might want to check my numbers.
>
> Thank You,
>
> Bob Knight, CET III
> 208-318-3057
> www.Firebyknight.com
>
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of G.
Tim
> Stone
> Sent: Thursday, March 13, 2014 12:32 PM
> To: [email protected]
> Subject: Warehouse Ceiling Question?
>
> What is the Ceiling in a Warehouse?
>
>
>
> Scenario:
>
> Packaged Steel Frame Building. Red iron frames spaced 30' between. 12"
> steel Z shaped purlins, spaced 3'-7" on center on top of the Red Iron
> frames.
> Steel Q-Deck pan (about 3.5" - 4" deep) attached to top of the Z purlins.
>
> High point of the building is 30'-0" AFF, ΒΌ : 12 roof pitch. The building
> insulation is on top of the Q-Deck. No vinyl insulated blanket that we
> usually see in warehouse construction.
>
>
>
> The occupancy is Group A Plastics, High Piled and rack storage, Storage
> height to 17'-0 AFF, ESFR Pendent Sprinklers, Depending on Manufacture
> used, deflectors can be up to 18" down below "CEILING".
>
>
>
> Is the "CEILING" at the point where the Q-Deck that rests on top of the
> purlin or is it the top of the pocket formed in the Q-Deck? I will
> rephrase, Is the "CEILING" at the top of the purlin or 3.5" - 4" higher
> (high point of Q-Decking)?
>
>
>
> Thank you in advance for clarification.
>
>
>
> 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]
>
>
>
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