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NFPA 13: 2013 Edition 9.3.2.3.1.(2) Location of Flex Couplings

Question asked by bfinnigan on Oct 28, 2020

Clarification required regarding Code 9.3.2.3.1.(2) NFPA 13: 2013 Edition. In a multistorey building where 4" standpipe penetrates the landings on each floor which is constructed using 12" Floor Joists, a plywood subfloor and concrete topper is the Flex Coupling location measurement taken from the underside of the concrete topper or is it taken from the underside of the Floor Joist?

 

The Code article specifically states 24" Below the Floor while the detail provided in the Annex A says Ceiling/Floor Assembly which creates confusion. 

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