This is a common problem when mixing types of heads. The same problem
arises when you have a small lobby less than 900 sf with QR (room
design is out) and the rest is residential (including the corridors
that open to the lobby). What do you do? The standard does not
address it. The norm is to use as much as you have for the one type
of sprinkler. Talk with the AHJ and pray for rain.
Roland
On May 29, 2008, at 8:50 AM, Ed Kramer wrote:
I've got a NFPFA 13 ('02) project that requires a 3,000 sf design
area due
to nonsprinklered combustible concealed spaces (TJI construction).
The upper floor consist of dwelling units with residential
sprinklers and a
central common area with QR sprinklers.
The total area protected by the QR sprinklers is less than 3,000 sf
(approx
2700 sf)
Do I calc a total of 2700 sf, or do I calc the 2700 sf plus 300 sf of
residential sprinklers?
Ed Kramer
Littleton, CO
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