"Steve Barker" wrote in message
...
Jim Elbrecht wrote:
On Sun, 5 Apr 2009 08:16:07 -0400, "Gene Bleuler"
wrote:

I had a new 4" deep concrete driveway poured last week. How long should
I wait before I should drive my sedan on it? What about allowing a small
delivery truck (UPS/FedEx) to pull in?

I wouldn't ever let a delivery truck drive on a 4" slab. Isn't 6"
standard for driveways? Or is there some newfangled additive that
makes concrete stronger?

[or is the extra cost of 2" just so low compared to the whole job that
it is just a good idea?]

Jim

ACTUALLY, you be lucky to find more than 3.5" in a driveway. That't the
height of a 2x4 thats used for forms. And it's always called 4".
Driveways are rarely 6" unless specially ordered that way. And a 4"
driveway is plenty strong for any city delivery truck. hell they backed a
full load of concrete in on mine to re-do the upper section and no adverse
effects.

s

YABBUT .........

It's difficult to find a craftsman nowadays who can cut a grade for a 2 x 4
framed pour that doesn't run from 3.5 to 6 inches thick.

For me, I like to give it a full month before driving on it with a larger
than average vehicle. After that, whatever's going to happen will. Just
put expansion joints and saw cuts, and roll the dice.

And ......... as an afterthought, a half or full sack mix more than required
is cheap insurance.

YMMV, but mine is always right ............ ;-)

Steve