Dear forumites,
I have a situation on a building where have have been contracted to do the
addition. The building is 40'+ at the peak. The existing and new building
are all protected (to be protected) with ESFR. The problem is that the
existing layout consists of several places where the branchlines (running
perp. to the bar joists) are spaced greater than 10'-0". The increased
spacing runs anywhere from 10'-1" to 10'-9". Each of the existing sprinklers
does not exceed the 100 sq. ft. In reading NFPA 13 ('02) Section 8.12.2.2.3
I see that an additional 1'-0" is allowed along the branchline when trying
to miss obstructions created by trusses/barjoists as long as the listed
criteria is met. Note that this only allows moving ESFR ALONG the line. No
mention of increased spacing between lines till you get to Section
8.12.2.2.4. But this section only applies to running parallel with the
steel. I will also note that the equivalent in the 2007 edition expands
8.12.2.2.3 to include wind bracing (what I would call x-bridging and/or
Horizontal Bridging). But it still states that sprinklers can only be moved
along the line. The GC would like us to continue with the spacing of the
original layout. I am resisting. My contention is that no matter what, the
distance between the branchlines should not exceed 10'-0". Am I right in
questioning the additional spacing between the lines or am I being to
literal in my interpretation?
Best Regards,
Ken Holsopple
Designer
Rowe Sprinkler Systems, Inc.
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