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Non combustible space above suspended ceiling...

Non combustible space above suspended ceiling...

Non combustible space above suspended ceiling...

(OP)
I have rooms that have a suspended l.a.t. ceiling where the l.a.t. ceiling doesn't connect to the wall.  This creates a gap around the perimeter of the room.  The wall does extend above the ceiling to the deck and the space above the ceiling is non-combustible.  Do I have to sprinkler above the l.a.t. ceiling?

RE: Non combustible space above suspended ceiling...

I have seen this in several different instances and always get varied answers.  Basically, I view it as the space above the ceiling is not a concealed space.  Therefore, you need to put sprinklers at the roof deck.  Then, your lay-in ceiling is an obstruction greater than 48" in width and you need pendent sprinklers at the lower ceiling.

Good luck!

RE: Non combustible space above suspended ceiling...

l.a.t. ceiling??? define please

RE: Non combustible space above suspended ceiling...

I assume Lay-in acoustical tile

RE: Non combustible space above suspended ceiling...

(OP)
Yes, lay-in accoustical tile.

RE: Non combustible space above suspended ceiling...

would say it depends on how wide the gap is.

RE: Non combustible space above suspended ceiling...

NFPA 13 references openings such as a return grill not disqualifying the space as concealed.  So, that is the limit of what I use.  Basically, if there is more than a 4 sq ft gap, then I go with it not being concealed and therefore, put sprinklers above the ceiling.

RE: Non combustible space above suspended ceiling...

Where does the 4 sq ft value come from?

RE: Non combustible space above suspended ceiling...

a 2'x2' Return air grille.  It is nothing more than a guess on where to draw the line.  Probably useless.

RE: Non combustible space above suspended ceiling...

Nfpa 13 8.14.1.2.2  Try this.

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