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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