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Posted by John Willis on June 16, 2005, 10:08 am
scribbled this interesting note:
>> My contractor has specified a 4" thick slab on grade for a new garage
>> floor. Is this the accepted thickness? I've read that driveways should
>> be 5" thick and house foundations 8-10" thick. The plans *do* call out
>> reinforcement.
>>
>> Comments?
>>
>
>Just an observation based on my poured driveway. Had a contractor who
>normally does commercial work do it, they were slow last winter.
>
>They used 3/8 rebar, tied in 16" squares. The perimeter was 6" thick.
>Foreman said the thicker perimeter serves two purposes. 1. Like a house
>concrete perimeter, serves as a beam. 2. Prevents water runoff wash from
>undermining the slab. The driveway itself is 3" thick. Simlar technique
>on the apron at the street. No frost line in the area, too warm a climate.
>
That perimeter bean serves another function as well. A floating slab
will do just that...float. That perimeter beam helps keep the
monolithic slab exactly where it was placed and it no longer wants to
float around on the surface of the ground.
--
John Willis
(Remove the Primes before e-mailing me)
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