OK I made a mistake
I mistook an exposed gym ceiling with concrete structure to be concrete tee
construction and evidently I was wrong. The "tees" are 8' on center, 8" wide
and 23" deep. The resulting bays are 60'-4" long. Technically I am screwed
away from both concrete tee and obstructed construction and unless someone
knows a way out of this that I can not find we have to put heads in every
bay.
Question is that the end tees are only 1'-4-1/2" from the center of tee to
the exterior wall. This results in a situation where there is a "soffit"
1'-8.5" wide and 23" deep BUT the "soffit " has a pocket 12.5" wide by
60'-4" long.
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Is it reasonable to treat this like a soffit and use the obstruction rule
based on an obstruction against a wall as in NFPA 13 2007 ed FIGURE
8.6.5.1.2?
The building is over 20' high so we are calculating 1,500 sqft.
Thanks,
Greg
Living Water Fire Protection, LLC
1160 McKenzie Road
Cantonment, FL 32533
850-937-1850
Fax: 850-937-1852
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