Does Corrugated Deck Affect Sprinkler Height?

4/15/2021

We have a project where we are trying to distinguish between frame and girder construction versus panel construction.

If we have steel frame and girder construction, beams are less than or equal to 7'-6" apart, but there is a corrugated deck that allows for heat flow above the girder (and wouldn't trap all heat), does this qualify as frame and girder?

Will the maximum deflector distance be 22-inches if there is a corrugated deck?

My assumption is "no" since heat is not capable of being trapped and a sprinkler needs to be placed in each bay within 12-inches of the deck.

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2 Comments

matt

4/15/2021 08:08:37 am

NFPA 13 addresses this directly. reference NFPA 13 (2016 edition) 8.5.4.1.2

Jay

4/15/2021 09:52:43 am

This ceiling is considered unobstructed construction due to the openings between the top of the beams and the corrugated deck that do not have the ability to trap heat. See 2016 NFPA 13:3.7.1[4]. For panel construction to be considered obstructed construction, there cannot be any unfilled penetrations at the interface between the beams and roof (metal deck).

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Does Corrugated Deck Affect Sprinkler Height?

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