Ok, so it's basically an insulating board? Typically the material I've seen is a non- or limited-combustible fiberglas material meeting UL requirements for smoke/flame spread. What makes you think it's combustible?
If space above the fiberboard is non-accessible, no storage, with no exposed combustible construction, where is the justification for adding sprinklers there? Typically there is no justification for adding sprinklers above a lay-in ceiling unless there is some exposed combustible construction or other unusual mitigating factor. I'm just not seeing three levels of sprinkler protection here in what has been described. Craig Prahl | Jacobs | Group Lead/SME - Fire Protection | 864.676.5252 | [email protected]<mailto:[email protected]> | www.jacobs.com<http://www.jacobs.com/> 1041 East Butler Road Greenville, South Carolina 29606 From: Sprinklerforum <[email protected]> On Behalf Of JD Gamble via Sprinklerforum Sent: Thursday, January 9, 2020 4:20 PM To: [email protected] Cc: JD Gamble <[email protected]> Subject: [EXTERNAL] RE: Concealed Combustible Craig, I'll do my best. Fiberboard on bottom of truss. Nothing but steel and space above the fiberboard. No visible marking on the manufacturer of the board. It's a late 80s installation. From: Sprinklerforum [mailto:[email protected]] On Behalf Of Prahl, Craig/GVL via Sprinklerforum Sent: Thursday, January 9, 2020 2:17 PM To: [email protected]<mailto:[email protected]> Cc: Prahl, Craig/GVL <[email protected]<mailto:[email protected]>> Subject: RE: Concealed Combustible A little clarity please. You have a ceiling, then there's 2 ft to the bottom of the bar joists which are 14" deep and on top of the bar joist is fiberboard? Is that right? Or is the fiberboard attached to the bottom of the bar joist which would beg the question of what is in the space above the fiberboard, any utilities, wiring, plastic piping systems, etc.? Can you be more specific on the Fiberboard? Any manufacturer data on this fiberboard material? Smoke/Flame spread ratings? Craig Prahl | Jacobs | Group Lead/SME - Fire Protection | 864.676.5252 | [email protected]<mailto:[email protected]> | www.jacobs.com<http://www.jacobs.com/> 1041 East Butler Road Greenville, South Carolina 29606 From: Sprinklerforum <[email protected]<mailto:[email protected]>> On Behalf Of JD Gamble via Sprinklerforum Sent: Thursday, January 9, 2020 3:11 PM To: [email protected]<mailto:[email protected]> Cc: JD Gamble <[email protected]<mailto:[email protected]>> Subject: Concealed Combustible I would like to query greater minds than mine on is a space CC or Not .... Basis of Code is NFPA 13 2016ed. Spaces above Ceiling, Below Floor Above: Situation is an Acoustical Grid Ceiling with 2x4 lay in tile (standard construction) 2' below metal open web joists (14" Depth) with attached FiberBoard. Essentially creating 3 spaces of consideration: The floor space below the ceiling, the space above the ceiling between the ceiling and the fiberboard, and the space above the fiberboard to the deck/floor above. The fiberboard being the combustible factor, would / should you extend coverage above and below it? Thanks In Advance for your thoughts. JD Gamble 307-763-3361 [LSS Inc Logo - Color] ________________________________ NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer. ________________________________ NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer.
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