SprinklerDesigner2
Mechanical
- Nov 30, 2006
- 1,251
NFPA #13 2013 Edition and composite wood joist construction in a hotel
What I have is a four story motel with a sprinkler system designed per NFPA #13 because the architect took some trade offs in distances to exits and drawings are clearly marked NFPA #13.
We have 16" deep composite wood joists on all floors.
I've never had to deal with composite wood joists in a NFPA #13 system so I just want to make sure I understand this correctly.
If I am reading it right my design area has to be a minimum of 3,000 sq ft but the density would be reduced to .05 gpm over light hazard areas. Over ordinary hazard areas the design area would remain 3,000 sq ft but of course the density would increase appropriately.
Where this will impact the most is the first floor where we have a rather large lobby, a dining room and several meeting rooms.
I can not apply the quick response reduction for ceilings <20'. I am pretty much stuck at .05/3,000.
My question is what about the rooms on the second and third floor? The fourth floor has a conventional attic that will have sprinklers so the fourth floor is straight forward.
Second and third floor are mostly rooms and corridor but we will have an occasional janitorial space. The corridors themselves appear to have standard 2"x8" wood joists with drywall attached above a suspended ceiling so there appears to be nothing special here except for the rooms and what little janitorial spaces we have.
The way I understand it so far is the rooms themselves are treated as standard NFPA #13 dwelling spaces where I can use residential sprinkles but in accordance with the listing or a density of .10 whichever is more. As I understand it the reasoning behind this is the rooms themselves are compartmentalized and firestopped. Am I correct in this thinking or am I missing something?
I know, Google is my friend so I will start looking but I was wondering what the group here would have to say about it.
What I have is a four story motel with a sprinkler system designed per NFPA #13 because the architect took some trade offs in distances to exits and drawings are clearly marked NFPA #13.
We have 16" deep composite wood joists on all floors.
I've never had to deal with composite wood joists in a NFPA #13 system so I just want to make sure I understand this correctly.
If I am reading it right my design area has to be a minimum of 3,000 sq ft but the density would be reduced to .05 gpm over light hazard areas. Over ordinary hazard areas the design area would remain 3,000 sq ft but of course the density would increase appropriately.
Where this will impact the most is the first floor where we have a rather large lobby, a dining room and several meeting rooms.
I can not apply the quick response reduction for ceilings <20'. I am pretty much stuck at .05/3,000.
My question is what about the rooms on the second and third floor? The fourth floor has a conventional attic that will have sprinklers so the fourth floor is straight forward.
Second and third floor are mostly rooms and corridor but we will have an occasional janitorial space. The corridors themselves appear to have standard 2"x8" wood joists with drywall attached above a suspended ceiling so there appears to be nothing special here except for the rooms and what little janitorial spaces we have.
The way I understand it so far is the rooms themselves are treated as standard NFPA #13 dwelling spaces where I can use residential sprinkles but in accordance with the listing or a density of .10 whichever is more. As I understand it the reasoning behind this is the rooms themselves are compartmentalized and firestopped. Am I correct in this thinking or am I missing something?
I know, Google is my friend so I will start looking but I was wondering what the group here would have to say about it.
. As always, you can call me if you need any additional help on this.