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Old 06-02-2014, 03:58 PM   #1
Jeff Sandberg
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Building a garage gym

I'm in the planning stages for building a backyard storage shed/personal 'box'. How thick should concrete be when laying a slab?
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Old 06-02-2014, 05:19 PM   #2
Jason Ippolito
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Re: Building a garage gym

Do some research but I would say about 4-5 inches
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Old 06-02-2014, 11:30 PM   #3
Steven Thunander
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Re: Building a garage gym

The thicker, the better...

I would go with 6" plus on the concrete. Then, you put stall mats on the concrete after everything is built.
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Old 06-03-2014, 06:29 PM   #4
Bryan Rowland
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Re: Building a garage gym

4 or more. It gets pricy the thicker you go. Ever thought of building a lifting platform? that will save the concrete.
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Old 06-04-2014, 07:48 AM   #5
Christopher Morris
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Re: Building a garage gym

Are you doing the work yourself, or is a contractor doing it? It's a very common error to over-float or over-finish, which brings more water to the surface and weakens the top layer. If you walk down your street, I bet you'd see that half the driveways have little round chips because the top surface was too weak. At least, that's what I see on my street. Definitely get someone who is good at concrete, as it will have to bear some impact, and you want it as strong as possible.

I don't know much about thickness, but found some interesting reading here:
https://www.google.com/search?source...te%20thickness (wfs)
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Old 06-04-2014, 08:40 AM   #6
John Burgeson
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Re: Building a garage gym

Ya I too am curious if you're doing this yourself or paying someone who should already know the answer to that.
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Old 06-04-2014, 09:18 AM   #7
Jason Rahm
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Re: Building a garage gym

Most contractors for driveways, sidewalks, etc just use 2x4s for forms so the thickness is about 3.5". If I was building a CrossFit shed I would use 2x6 for forming material and potentially add a grid of #4 rebar at 1' center-center. I would put the slab on 4" of compacted aggregate.
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Old 06-04-2014, 05:56 PM   #8
Jeff Sandberg
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Re: Building a garage gym

Thanks for all the feedback. I'm in the North West region in the middle of Washington state, and, on the one hand, the cement guys seem ignorant of what I'm looking for, and, on the other hand, I want it done right the first time. Thanks again, gang!
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