While I don't like to disagree with my friend Travis I feel compelled to
point out that 8.15.1.2.5 applies _*only*_ to wood joist or solid wood
joist construction. It's also been hammered at me and many others that
TJI's such as Ben described are not "wood joists" for NFPA 13 purposes.
My thought for the owner, Ben, is that he would not have to fill the
space with insulation, merely from the ceiling to the bottom of the TJI,
per 8.15.1.2.8, and follow the firestopping mandates for the channels
formed by the joists.
sincerely,
*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 03/28/2018 9:19 AM, MFP Design, LLC wrote:
*I think 8.15.1.2.5 is going to be your best bet. The issue is that
in many other places of the standard, composite wood joist are
specifically handled differently than wood joist and are not
considered “similar solid member construction.”*
**
*As far as the specially listed sprinklers, I think you would have to
use them with 8.15.1.6. This says less than 36”, which I take as from
zero to 36” in depth. The specially listed sprinklers have a
requirement of 6” minimum clear space. This gets you back to there is
no sprinkler that is available to protect this space. *
**
*I would lean back to 8.15.1.2.5 and keep sprinklers out of the
space. But, you will need to increase the design area to 3000 sq ft
for adjacent spaces.*
**
**
**
MFP_logo_F
Travis Mack, SET
MFP Design, LLC
3356 E Vallejo Ct
Gilbert, AZ 85298
480-505-9271
fax: 866-430-6107
email:[email protected] <mailto:email:[email protected]>
http://www.mfpdesign.com
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*From:* Sprinklerforum
<[email protected]> *On Behalf Of *Mike
Hairfield
*Sent:* Wednesday, March 28, 2018 9:13 AM
*To:* [email protected]
*Subject:* Re: concealed space less than 6" deep
I was at a AFSA NFPA 13 2013 ed seminar that was given by the AFA
Virginia Chapter
that the Great Bob Caputo was the instructor and this came up.
If I remember correctly he stated that sprinklers are not required,
but maybe it was
during one of the times that doze off.
Mike
------------------------------------------------------------------------
*From:*Sprinklerforum <[email protected]
<mailto:[email protected]>> on behalf of
Ben Young <[email protected] <mailto:[email protected]>>
*Sent:* Wednesday, March 28, 2018 12:06 PM
*To:* [email protected]
<mailto:[email protected]>
*Subject:* concealed space less than 6" deep
I feel like this has come up here before, but nothing came back when I
did searches through the archives.
I've got a concealed space that needs sprinklers, but I don't know how
I'm going to put them in.
(Light hazard office space under 2013 ED of 13)
Wood TJI construction with an ACT suspended ceiling below it.
From top of joist to face of ceiling is only 16.5" deep
TJIs are 12" deep
How the heck do I protect this space with only a 4.5" gap that will be
even smaller with the grid?
Owner refuses to fill space with insulation inside trusses (for the
time being)
CC spec app heads not required since the space is so small anyway, but
I think that also means I can't use CPVC, which would make hanging the
pipe parallel to the trusses a lot easier.
Its obstructed construction, so I should be able to put pendent heads
below the bottom edge of the TJIs, but it will be no more than 2-3
inches above the ceiling.
I don't even know if that will work so worst case is I need heads
inside every truss space, right?
The salesperson is telling me to use some weird combination of
8.15.1.2.3 (which I believe only applied to double trusses ) and
8.15.1.2.5 (which only applies to solid member construction and then
you have 8.15.1.2.6 directly below it calling out TJIs)
This definitely feels like a catch-22.
Thanks,
Benjamin Young
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