How thick the concrete is poured is only one part of the equation. The is
also the shape of the cross-section of the slab (often thicker at the edges)
and the amount of reinforcement (mesh and rebar) that you use.
Basically, for a shop an 6-8" thick slab with 12" thick 12 wide edges
(submerged thickness) with large rebar around the outside, smaller rebar
front to back and side to side and mesh everywhere, poured over a compacted
gravel base topped with about 2" of sand is a good place to start. If you
want more, add thicker section in the center like a truss (think of how a
flatbed semi-trailer undercarridge is made.
Did mine (in IL) based on all that, 28x33, NO cracks in 20+ years. Plan to
do it that way again here in TX.
Mark V.S. in Austin, TX
-----Original Message-----
From: epetrevich@relavis.com [mailto:epetrevich@relavis.com]
Sent: Friday, May 04, 2001 12:52 PM
To: shop-talk@autox.team.net
Subject: Concrete
Does anyone have a link to a site that explains the best thickness of
concrete for certain applications? (I don't have alot of experience laying
concrete)
Example...
I have a raised porch that is 9'X22'. It's on a bed of well tamped QP. I
want to put a concrete slab over it for the top. This is where my hot tub
goes and I want it level and solid.
How thick should the slab be? I'm trying to figure out how much concrete I
need.
Then, (since I now have the funds for the "ultimate shop project", I'll be
pouring a foundation for the new shop soon. How thick should it be? (I'm
guessing that the local "standards" may not be enough.) I'm planing on
working on my tractors in there. Also, I'm putting in a car lift. The
floor will have radiate heat hoses in it was well. Is this a part of the
project to leave to a professional?
Thanks in advance.
Inch
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