The soffit against the wall is for a SOLID obstruction protruding out
from the wall which forces the heat out to one side.
Why not just label this portion of the ceiling as Obstructed
Construction? You can then meet the standard beam rule form the side
of the obstruction and reach the wall beyond it.
Discuss BEFOREHAND with the AHJ for a calm discussion of options
verses the heat of battle in the field.
Roland
On Apr 3, 2007, at 3:50 AM, Greg McGahan wrote:
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.
------------
* * *
* * *
*** *
*
*
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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