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RE: Non-combustible floor sheathing

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I have used plywood screw attached to steel decking for a project.  Structurally it worked fine.  There is a problem with acoustics however.  The impact from foot traffic sounded like a drum.
    For fire rating, acoustical and economics I suggest using a composite steel joist with the spacing @ 4 foot on center.. the 3 1/2 inch thick hard rock concrete floor is formed with a removable plywood form.  With a gypsum ceiling the system will meet fire and acoustical ratings.  The cost will vary with the scope of the project and the re-use of the plywood forming system etc. 
    Call to discuss
Jim L. Chatterley PE
Composite Framing Systems, Inc.
2723 Currier Ave., Simi Valley, California, 93065
805-520-3666   Fax 805-583-1434

From: Wesley Werner [mailto:wwerner(--nospam--at)]
Sent: Friday, February 16, 2007 12:01 PM
To: seaint(--nospam--at)
Subject: RE: Non-combustible floor sheathing

Squeaking is something to be careful of with wood over decking. What I have seen done on one project was to use a layer of homosote between the decking and the plywood.

Wesley C. Werner

-----Original Message-----
From: Donald Bruckman [mailto:bruckmandesign(--nospam--at)]
Sent: Friday, February 16, 2007 2:47 PM
To: seaint(--nospam--at)
Subject: RE: Non-combustible floor sheathing

They do make fire-retardant plywood sheathing.  I’ve used it (sparingly) in some Type 1 installations.  You might check APA.  I’m not sure how you’d fasten it however.  Plywood over steel deck seems to me like a recipe for trouble from a noise, (squeaks, etc.) standpoint however (no glue).  Be careful.




From: Jared Keyser [mailto:jkeyser(--nospam--at)]
Sent: Friday, February 16, 2007 11:23 AM
To: seaint(--nospam--at)
Subject: Non-combustible floor sheathing


Dear list,

Does anyone know of non-combustible subfloor product that can be used over structural metal decking as a floor sheathing.

I have a design/build project where due to size and location, a concrete floor deck will be difficult and expensive to install.  The  contractor originally desired plywood sheathing over metal deck, however, it is located in a Type II building which requires non-combustible construction.  There are several roof deck type reinforced gypsum products that indicate span capability over the flutes, however, the ones I've researched indicate that they are not for foot traffic.  Currently I am leaning towards steel plate if concrete is not possible, however, I just don't like the feel of steel plate floor systems in an office setting.

Any suggestions? 

Thanks in advance.

Jared F. Keyser, P.E.