Posted by NE IA on November 05, 2009 at 05:20:36 from (206.72.18.153):
In Reply to: Concrete slabs posted by J. Schwiebert on November 04, 2009 at 18:33:29:
Fiber is a secondary reinforcment, not to be confused with the most important reinforcment -rebar.
A uniform subgrade is probably the most important thing required for a good job.
If half the slab is a cut, and the other half is fill, it will crack 99% of the time in frost areas.
Since 1964 I have never poured less than a 4,000 # mix.
I would consider 6" if you can afford it, 4 is ok but this is simething you intend on doing once.
Spend a few dollars and put chairs under the rebar so they are in place--lower 1/3 of slab.
I argue these issues on a weekly basis, my coment is always --just drive around town and look for yourself, then come back and we will discus the issue.
I am lucky to work for 99% of the folks that want it to be perfect in the end, not just get by.
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