I am working on a building with a unique facad where I am trying to figure
out the calcs. Each end of the building has a 24x24 “tower” where the roof
slope on 4 sides to a peak. The center of the building over the entry has a
24x17 inverted V sloped roof. Connecting each of these is a mansard. All
construction is combustible. The roof slopes are 7:12. The total area is
approximately 2000 sqft.
The sections are separated by a plywood barrier.
The occupancy is Light Hazard. It’s is a dry system so I have to increase the
RA by 30%. Since the slopes are steep enough, I have to increase another 30%,
for a total of 2535 sqft design area.
My layout consists of 27 sprinklers (including 3 attic AS in the center
section). No realistic way to decrease due to the arrangement. This totally
blows out that calc with a 27 sprinkler flow.
Any thoughts on how to decrease the number of sprinklers flowing? I have tried
all of my tricks but haven’t come up with anything yet.
Todd G Williams, PE
Fire Protection Design/Consulting
Stonington, CT
860-535-2080 (tel:860-535-2080) (ofc)
860-554-7054 (tel:860-554-7054) (fax)
860-608-4559 (tel:860-608-4559) (cell)
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