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RE: concrete topping on plywood floor sheathing

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I am not certain that you can do something with typical toppings. You probably need to go to a regular weight or light weight structural concrete. You will also need to go thicker that the typical 1.5." Also (I only know the UBD reference) look at UBC 1921.6.12. It requires a minimum thickness of 2."
 

Mark E. Deardorff

Structural Engineer

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From: Bruce Holcomb [mailto:bholcomb(--nospam--at)brpae.com]
Sent: Thursday, January 04, 2007 1:58 PM
To: seaint(--nospam--at)seaint.org
Subject: concrete topping on plywood floor sheathing

I’m looking for design information for concrete topping over plywood floor sheathing, but haven’t found anything.  Typically, I haven’t needed to consider any shear capacity from the topping, but I have a project that I am not getting enough capacity from the plywood and thought I’d explore the shear capacity of the topping.  Can this be done?  Anybody know what computer program to use?  (Just kidding… I mean do you know of any references?)  And how do I get the shear load into / out of the concrete topping?  Thanks!

 

 

 

Bruce D. Holcomb, PE, SE

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Butler, Rosenbury & Partners

Springfield, Missouri

Phoenix, Arizona

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