curved ceiling spacing
curved ceiling spacing
(OP)
1. An area measures 12 feet across at floor level
2. Ceiling is curved/ barrel shape/ half moon
3. the arc of the curve measures 22 feet
per nfpa 13 you measure spacing along the slope. like on peak ceilings
so are two rows needed??
can both rows start off center?? like is allowed on peaked ceilings??
2. Ceiling is curved/ barrel shape/ half moon
3. the arc of the curve measures 22 feet
per nfpa 13 you measure spacing along the slope. like on peak ceilings
so are two rows needed??
can both rows start off center?? like is allowed on peaked ceilings??





RE: curved ceiling spacing
Travis Mack
MFP Design, LLC
www.mfpdesign.com
RE: curved ceiling spacing
In this instance (my opinion) as long as you met the obstruction criteria, which if you put the head at the highest point, you would.
RE: curved ceiling spacing
RE: curved ceiling spacing
If the ceiling sloped from a low point up 11' on the slope and then back down 11' and the area from wall to wall is 12', would you put in a sprinkler on each side of the slope?
Which one does the curved ceiling more closely approximate? That will give you an idea of how to protect it.
Travis Mack
MFP Design, LLC
www.mfpdesign.com
RE: curved ceiling spacing
I remember reading something on Quonset huts. I think it was a factory mutual handbook that was published long ago that I can't seem to find. It was published in 1954 when a lot of Quonset huts were being built. I misplaced that along with my 1931 edition of NFPA #13 and my Smoley's Tables of Slopes and Rises (before pocket calculators and computers).
If you haven't seen a 1931 edition of NFPA #13 it's a real hoot.
I'll bet Stookey has seen some Quonset hut type jobs.
RE: curved ceiling spacing
The situation that is being described sounds like it's a finished barrell ceiling and I am guessing would be drywall. If you space a line at the top you would have no issue covering the 12' wide floor space and the sprinklers would not be obstructed.
RE: curved ceiling spacing
You calculate based on floor space, but layout based on sloped areas.
I hope everyone has a safe and happy Independence Day weekend!
Travis Mack
MFP Design, LLC
www.mfpdesign.com
RE: curved ceiling spacing
"3. the arc of the curve measures 22 feet"
Is that the total distance along the curve or is it the radius?
What does it look like? http://en.wikipedia.org/wiki/Arch
If the 22 feet were the radius wouldn't it be a three-centered arch? Just about would have to because I'm having trouble visualizing what a arch would look like with 12' between walls and a linear distance along the arch of 22'.
RE: curved ceiling spacing
may also be in handbooks after 2002
RE: curved ceiling spacing
8.6.3.2.5 Under curved surfaces, the horizontal distance shall be measured at the floor level from the wall, or the intersection of the curved surface and the floor to the nearest sprinkler shall not be greater than one-half the allowable distance between sprinklers.
RE: curved ceiling spacing
may also be in handbooks after 2002
RE: curved ceiling spacing
here we go again
same exact ceiling, but now we need to install smoke detectors
nfpa 72 seems a little silent, but does have the peaked ceiling rule
so it looks like smoke detector spacing should fall under same rules as peaked?? for a curved ceiling??