Well actually there is ONE reference in the codes for using spray
sprinklers and glass. It is in NFPA 101 - Life Safety Code under
Atriums and applies to a 1 hr separation. The trick there is ensuring
the set-up is "wetting the entire surface". From this humble
beginning, it has been a common practice to apply it elsewhere.
Roland
On Sep 30, 2008, at 6:02 AM, Chris Cahill wrote:
Cause there is nothing in the code that I am aware of that gives a
rating
with ordinary sprinklers at any spacing. The 6' comes in about
openings in
floors and as an alternate in the atriums. These are two specific
situations addressed but not a general 1 hr rating. The floor
opening has
nothing to do with ratings and the atrium needed a solution to
rating before
the development of the Tyco heads once code officials decided to allow
multiple floors to be connected without a traditional rating.
Tyco heads are listed and tested to the same standard as other rated
construction methods for ratings. It's the same test for sheetrock
and
concrete. If you have a corridor that requires a rating Tyco heads
are the
only code complying solution I am aware of if using sprinklers.
And to Craig's comment if it's unrated then you don't need any
sprinklers on
the glass.
Of course standard note and discussion point regarding a contractor
choosing
methods of rating vs. the architect and engineer who should have
specified
methods.
Chris Cahill, P.E.
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