Then just do standard spray sprinklers at 130 sq ft max spacing. Reduce
the design area to 900 sq ft. Use 4.2k sprinklers to keep the
over-discharge down. I think you are correct in using the insulation
for your ceiling to locate your deflectors.
Travis Mack, SET
MFP Design, LLC
2508 E Lodgepole Drive
Gilbert, AZ 85298
480-505-9271
fax: 866-430-6107
email:[email protected]
http://www.mfpdesign.com
https://www.facebook.com/pages/MFP-Design-LLC/92218417692
Send large files to us via: https://www.hightail.com/u/MFPDesign
LinkedIn: https://www.linkedin.com/in/travismack
On 11/21/2016 4:01 PM, Ben Young wrote:
Travis,
I actually don't want to use CC heads because of the onerous draft
stopping requirements, so that's a negative.
Space is heated, so we're talking wet system here.
Benjamin Young
On Mon, Nov 21, 2016 at 3:10 PM, Travis Mack, SET <[email protected]
<mailto:[email protected]>> wrote:
I would say you have combustible framing members less than 3' on
center so you are limited to 130 sq ft spacing. If the space is
less than 60" deep, you may want to consider something like the
Tyco CC3 and get up to 16' spacing at 256 sq ft. Also, the design
area would be reduced. You would have 1950 sq ft with SSU,
assuming this is dry, or 1300 sq ft with CC3, again, assuming it
is dry.
Travis Mack, SET
MFP Design, LLC
2508 E Lodgepole Drive
Gilbert, AZ 85298
480-505-9271 <tel:480-505-9271>
fax:866-430-6107 <tel:866-430-6107>
email:[email protected] <mailto:email:[email protected]>
http://www.mfpdesign.com
https://www.facebook.com/pages/MFP-Design-LLC/92218417692
<https://www.facebook.com/pages/MFP-Design-LLC/92218417692>
Send large files to us via:https://www.hightail.com/u/MFPDesign
<https://www.hightail.com/u/MFPDesign>
LinkedIn:https://www.linkedin.com/in/travismack
<https://www.linkedin.com/in/travismack>
On 11/21/2016 12:56 PM, Ben Young wrote:
So I have a crawl space that was originally supposed to get
drywall on the underside of the trusses, but now the owner wants
sprinklers instead.
This is inside an apartment building of type VB construction
under the ground floor. The crawl space is more than 36" deep,
so it doesn't require CC heads.
My question is how the heck do I treat the spacing for the heads
I'm going to install?
The structure is 14" deep TJIs that are stuffed with non-faced
batt insulation that's held in place by furring strips. My gut
is telling me its not a smooth flat ceiling, but its also not
exactly combustible obstructed either.
At this point, I don't even know whether I should consider it
obstructed or unobstructed.
I'm leaning towards the insulation will act as a ceiling and I
can go 1-12 down from the bottom of the truss, and do 225 SQFT
spacing, but can't find anything to assuage my fears in the code.
This project was submitted under the 2010 edition of 13, but the
AHJ now has adopted 2013, FYI.
I looked through 8.15.1 but that doesn't really tell me HOW to
space in these areas, just if I can omit or not... also didn't
find too much of use in the AFSA informal interps.
Any thoughts on this?
Benjamin Young
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