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5" Concrete garage floor over wood frame?

5" Concrete garage floor over wood frame?

5" Concrete garage floor over wood frame?

(OP)
Many times I saw 1.5" concrete topping over plywood and wood frame called out for townhome or condo.  I never saw 5" concrete of (2) cars garage floor over a plywood and wood frame floor.  Have anyone ever call out 5" concrete on top plywood and wood frame before?
TIA
 

RE: 5" Concrete garage floor over wood frame?

I can't say that I have.
I trust that the plywood is acting as formwork only.

RE: 5" Concrete garage floor over wood frame?

In the past most building codes prohibited wood framing from supporting the permanent dead load of concrete.  There were some exceptions, one of which was the use of light weight concrete fill over plywood floors.  Although some codes today no longer have this restriction, I still would avoid supporting concrete on wood framing.

One of the major problems is that wood creeps, so over time the deflection due to dead load will almost double.    

RE: 5" Concrete garage floor over wood frame?

I have used 1.125" T&G ply over 2X12 joists with a 3" normal weight topping.  Have to mind the deflections, which I restrict to L/1000 in order to not crack the concrete.  I add extra beams as needed to achieve this, depending on the layout of the garage floor.  I also specify a Marine grade for the ply.  Expensive, but it works.

 

Mike McCann
MMC Engineering

RE: 5" Concrete garage floor over wood frame?

The APA has Technical topics
TT-071A dated Nov 2005

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