Greg
Are you asking if the combustible concealed sprinklers are acceptable for this 
scenario or are you trying to eliminate sprinklers in the space based on the 
metal C Channel joists. If the plywood is not FRT then this space requires 
protection unless it is less than 6" from top of channel to bottom of channel..
This is my opinion

From: Sprinklerforum <[email protected]> On Behalf 
Of Parsley Consulting
Sent: Wednesday, August 22, 2018 4:57 PM
To: [email protected]
Subject: Re: Metal C Channel joist combusitble concealed

Greg,

I believe your best opportunity is in 8.15.1.2.5 if you can convince yourself 
that the C-channel is equivalent to wood joist or other solid construction.   
However I'd be extra cautious in that assessment as you may be required to 
provide a minimum 3,000 ft² remote area per 11.2.3.1.5.1.

quick thoughts,
Ken Wagoner, SET
Parsley Consulting
350 West 9th Avenue, Suite 206
Escondido, California 92025
Phone 760-745-6181
Visit the website<http://www.parsleyconsulting.com/>
On 08/22/2018 1:00 PM, 
[email protected]<mailto:[email protected]> wrote:
Am I missing something or is there not an exception for protecting comb 
concealed spaces with Metal C Channel joists and plywood on the top and bottom?


Greg C. McGahan
Genesis Fire Services, LLC.
4187 Farrington Road
Milton, FL 32583
O - 850-637-8535
C - 850-712-9555





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