Fire Detector false ceiling

[rjjff]

I have a Steel building with a pitched roof Aprox 12000 Spft office space (normal interior construction)throughout the facility. The entire building with the exeption of one room has lowered ceilings with smoke alarms attached. One room aprox 600sqft has an open ceiling to the rest of the facility with smoke detectors on the lowest portion of the pitched roof. Is the single room required to have a lowered ceiling with smoke detectors?

 

[cdafd]

""One room aprox 600sqft has an open ceiling to the rest of the facility with smoke detectors on the lowest portion of the pitched roof.""""

are you saying that if I stand in this room and look up I see the building pitched roof????


and not sure where these detectors are located:: "" with smoke detectors on the lowest portion of the pitched roof"""

are they actualy on the pitched building roof and not in the room???


""""Is the single room required to have a lowered ceiling with smoke detectors? """

are you asking is this room suppose to have a ceiling???




one ohter question does the building have a fire sprinkler system???

 

[rjjff]

One room aprox 600sqft has an open ceiling to the rest of the facility with smoke detectors on the lowest portion of the pitched roof.""""
are you saying that if I stand in this room and look up I see the building pthe pitched roof????
Yes, you would see the pitched roof

and not sure where these detectors are located::
Smoke detectors are located aprox 3ft from the exterior wall on the lower portion of the Pitched roof.

"" with smoke detectors on the lowest portion of the pitched roof"""are they actualy on the pitched building roof and not in the room???""""Is the single room required to have a lowered ceiling with smoke detectors? """are you asking is this room suppose to have a ceiling???

Yes is the room required to have a droped ceiling

 

[cdafd]

rjjff

why is the room required to have a ceiling???

""Smoke detectors are located aprox 3ft from the exterior wall on the lower portion of the Pitched roof.""

does nto sound right, but would have to see the entire building before making a call



does the buiilding have a fire sprinkler system???


so how are you connected with this???inspector, worker, fire alam company, etc?????

 

[rbulsara]

Is this room also open to other space which happen to be the space above the hung ceiling for other room? In other words, does the walls of this room go all the way up to the pitched roof or not?

That makes a difference. If they do, you need detectors near the peak of the roof, per NFPA. If not, you need to first find out why there is no ceiling. The make a decision.



Rafiq Bulsara

http://www.srengineersct.com

 

[rjjff]

why is the room required to have a ceiling???""
To provide a Smokeproof enclosure??

detectors are located aprox 3ft from the exterior wall on the lower portion of the Pitched roof."" I have attach a Picture of the Building (small dots), I hope this helps.

does nto sound right, but would have to see the entire building before making a call, does the buiilding have a fire sprinkler system???
No, it does not have a sprinkler.

so how are you connected with this???inspector, Inspector

worker, fire alam company

Is this room also open to other space which happen to be the space above the hung ceiling for other rooms? Yes

In other words, does the walls of this room go all the way up to the pitched roof or not?
No the walls do not go up to the pitched roof.


That makes a difference. If they do, you need detectors near the peak of the roof, per NFPA. If not, you need to first find out why there is no ceiling.
Not sure why there is no ceiling. Building owner thouht it was legal.

Thanks

 

[EEJaime]

This depends on your local AHJ and the codes you are under, but some building occupancies require protection both on the lowered ceiling and on the structure above it. They can also require protection in every portion of both that are seperated from each other. [sometimes with a minimum size of 100 square feet].

Nothing would require you to add a ceiling in the high space, unless it communicates with the rest of the building's high ceiling and the smoke detection is not layed out with the proper coverage for that condition. If the walls are constructed with floor to structure studs and gyp, each space needs it's own coverage and you can have or not have dropped ceilings to your heart's desire.

Regards,
EEJaime

 

[cdafd]

rjjff

do I understand correctly that you are a fire alarm inspector??


If so suggest you talk to some one in your company and have them look at it, then pull out nfpa 72 and see if it complies with what is there.


why are there smoke detectors on the roof line would be my first question.

if the answer that they are required, then with the ceiling, in the office area open to the roof line. I would say that the entire roof line needs smoke detectors spaced as per nfpa 72, to meet nfpa 72