I am working on a modification to an existing system in a residential
occupancy. The design basis for the system is NFPA 13 (2002) Section
11.2.3.5 (4 residential sprinkelrs, 0.10 density). In the revision,
the architect has added soffits and drop ceiling areas in certain
rooms. As an example, in the bathroom (>54 sqft), there are two areas
where the ceiling is 1 ft lower than the rest of the space, and
greater than 30" from the wall. Due to the size of the room, the
distance required for obstructions against a wall cannot be met.
Section 8-10, which covers installation of residential sprinklers,
does not incorporate the same criteria for ceiling pockets as the
sections for commercial sprinklers. This being the case, the bathroom
will require 3 sprinklers instead of 1 if the soffits are not there.
The entire room is 90 square feet. Three sprinklers does seem like
overkill. We could switch to a commercial quick response sprinkler
for this space, but I do not necessarily want to mix residential and
commercial within a unit. It could create problems down the road for
maintenance. This project has enough of a sordid history. Any thoughts?
Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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