Are sprinklers required above false ceilings? If required, What should be the Minimum Space above False Ceiling to consider sprinkler installation?
No, unless the space above the false ceiling is combustible or there are a large quantity of combustible material.
There are other locations where sprinklers may be required or sensible above a false ceiling, also known as a suspended ceiling. For example, if the above ceiling cavity is used as an air plenum. If the suspended ceiling does not extend to perimeter walls, a condition also known as a ceiling cloud, sprinklers could be required both above and below the ceiling panels.
An alternative approach is to use a drop-out ceiling panel that will allow you to install sprinklers above the ceiling without the need to install them below the ceiling too. This can be an economical and practical alternative.
There is a good write-up about drop-out ceilings at bit.ly/WhitePaper-DropOutCeiling.
Michael - What brings in the requirement for sprinklers above a suspended ceiling if that space is used as an air plenum. See NFPA 13, 2019 Section 9.2.1.
It depends on what's above the "false" ceiling. For example, NEC 700.10(D) "Feeder Protection for Emergency Feeders" requires sprinkler protection above a suspended ceiling if an emergency feeder that is not 2-hour rated is routed in that ceiling space.
Retrieving data ...