There is nothing in 13 that clarifies the intent of the 10 ft
separation. Also by a literal application, you can take a larger
acceptable ceiling pocket, put a divider in it and it is then
unacceptable (due to the separation criteria). Now that makes no
sense and although logic does not always rule, it mostly does.
The reason for the 10 ft separation is that we don't want the ceiling
jet to have to go through TWO ceiling pockets in order to reach the
second ring of sprinklers. I did an article on just this topic in
the NFPA Journal in the March 04 issue. You can access it from our
web page at:
http://www.firesprinkler.org/techservices/articles/
ceilingpoketsnfpa04.pdf
Needless to say, when something is not explicit identified in 13, you
need to discuss it beforehand with the AHJ.
Roland
On Sep 11, 2007, at 7:31 AM, Fletcher, Ron wrote:
Ed, A new guy here put a sprinkler in each skylight and I
challenged him
on why. He pointed to 8.6.7 and asked if they could be omitted
where it
said that. Damned if I could find anything in 13.
Ron Fletcher
Aero Automatic
Phoenix, AZ
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ed
Kramer
Sent: Tuesday, September 11, 2007 7:19 AM
To: [email protected]
Subject: RE: 8.6.7 Ceiling Pockets
Ron, if my memory hasn't completely gone, I remember a discussion that
essentially said you could have multiple skylights with less than 10'
separation and treat them as a single skylight providing the aggregate
volume was less than 1000 cf. Does this ring a bell with anybody
else?
Ed Kramer
Littleton, CO
Five 2 ft. x 2 ft. X 2 ft. Skylights located in a row each with 2 ft.
separation from the next. Does 8.6.7.1 require each skylight have to
have a head because they are not separated by at least 10 ft?
Ron Fletcher
Aero Automatic Sprinkler
Phoenix, AZ
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