New Building

[Blair]

> One thing overlooked by the crew pouring
>the concrete is lines in the sand under the slab. often the subgrade
>is raked smooth but the rebar(reinforcement rod) makes a imprint in
>the sand that has the same effect as a joint atop of the slab. The
>slab will crack at the imprint all the way up to the surface.


Now that is interesting! Never heard that one, but is makes sense. When
I built my garage we
used 3/4 minus vibrated and compacted dead smooth. A friend works for a
large construction
company and had some rebar left over from a bridge job. We double matted
3/4 and 1 inch
rebar four inches apart vertically and12 in on center horizontally. The
floor is a minimum of 8-9
inches thick and was properly cured. I can put the Cat in and not
worry. One other point,
make sure your rebar is at least two inches below the finished surface to
also prevent cracks.
blair in Oregon


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