Travis,
NFPA 13 (2002) 3.3.4 defines ceiling height as the distance between
the floor and roof deck. By your commentary, it looks like you would
have to use the 28' height. If you had a waffle-type pattern, you
might be able to make some justification since you would not likely
have a ceiling jet above the bottom of the lowest point of the
structure in that situation. Would it be practical to have them
construct a ceiling at the bottom of the tees?
At 02:03 PM 4/9/2007, you wrote:
Ok..this may be a stupid question, but here goes:
If I have concrete tee construction, what can I use as the roof deck. I
have an area with 28' to bottom of deck and 26'-2" to bottom of tee. If I
can use the bottom of tee as the maximum ceiling height, then I can use 0.60
gpm density using Tyco k17-231 sprinklers. If I need to use 28', then the
density goes to 0.80 gpm / sq ft. This is a retrofit, and the existing
system works with 0.60, but does not work with 0.80. I am looking for
something to justify the 0.60 gpm as being adequate.
Travis Mack, SET
MFP Design, LLC
480-505-9271
[EMAIL PROTECTED]
Examine yourselves to see if your faith is genuine. Test yourselves. Surely
you know that Jesus Christ is among you; if not, you have failed the test of
genuine faith. 2 Corinthians 13:5 NLT
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
860-535-2080
www.fpdc.com
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