I believe NFPA 2007 has addressed this issue.  I am researching that now.

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Maag, Barry
Sent: Tuesday, August 05, 2008 9:08 AM
To: [email protected]
Subject: RE: Floating Ceilings

I have seen these types in the past and the "space" around the floating
ceiling was used for the return air for HVAC. This made the area above
the ceiling a plenum thus requiring sprinklers


-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Rick
Green
Sent: Tuesday, August 05, 2008 7:59 AM
To: [email protected]
Subject: Floating Ceilings


I am in the design phase installing wet pipe sprinkler systems
protecting new schools.

I have noticed that in several of the rooms in the schools(cafeteria,
band room, main corridor that runs the length of the school), architect
has designed lay-in ceiling systems with gaps ranging from 4" to 12"
along the walls and between sections of ceiling within the rooms
(floating ceiling sections).

I do not believe my non-combustible concealed space above the ceilings
is concealed anymore and may require protection.

Has anyone dealt with this?

I have heard some discussion that if the total square feet of the
openings is below a certain percent of the total square foot of a space,
sprinkler protection above the space may not be required?

Interesting thing is that the school is being built as a "Green" project
and seems like the designed openings would make the schools less energy
efficient.

Anyone's help would be most appreciated...



Rick E. Green
District Manager
East Coast Fire Protection, Inc.
1113 Cavalier Boulevard
Chesapeake, Virginia 23323
757/485-7486(p), 757/295-0956(direct), 757/328-0131(cell)
[EMAIL PROTECTED]


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