Steel Joists, Wood Floor Combustible Concealed?

6/30/2022

I'm working on a project that is using cold-formed steel joist framing to build a mezzanine in a existing warehouse. They are using 3/4" plywood as the subfloor. They are actually forming the studs on site as they go.

Is this considered a combustible concealed space?

Would this require COIN (combustible interstitial) sprinklers per NFPA 13 Section 8.15.1.6?

The framed joists are 2-inches deep, and from deck to ceiling is 60 inches.

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4 Comments

Dan Wilder

6/30/2022 07:59:47 am

Yes - This is considered a combustible concealed space (upper deck wood framing and it sounds like the support columns may also be combustible.

No - Total depth of the space exceeds 36" depth requirement and can utilize standard or extended coverage sprinklers (pending obstruction clearances)

Pretty typical to get a steel truss with an upper wood nailer plate with the upper wood deck/floor, just sucks because you have to bang in the top beam clamps through the wood to get them to grip on the steel top flange. The nailer is typically too tight to get a horizontal wood sammy to work.

Glenn Berger

6/30/2022 08:13:20 am

Initial review you have concealed combustible construction.

Mike

6/30/2022 08:15:38 am

Combustible concealed space exceeding 36" in depth. COIN is not applicable. Check the date sheets

Jesse

6/30/2022 11:31:37 am

Yes it is. However, there are ways to avoid protecting the joist channels depending upon how deep they are. Consult the combustible concealed space section in 13, and as always, ask your AHJ

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Steel Joists, Wood Floor Combustible Concealed?

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