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Posted by Bob Morrison on June 16, 2005, 10:30 am
In a previous post butch burton says...
> Anybody answer how thick and what PSI concrete one should have for a
> driveway to support a 25K# truck or trailer?
>
I would go with a minimum of 6-inch thick on a minimum 6-inch compacted
crushed rock (3/4" minus) base. You can help spread loads if you use a
geotextile between the gravel and native material.
Specify a minimum 3500 psi low-slump concrete with 6% air entrainment.
Provide 1-1/4" deep crack control joints - either tooled or saw cut
every 150 sq.ft. (maximum). For example, if the driveway is 12 feet
wide then put a joint every 12 feet. Joints should be cut as soon the
surface is hard enough to walk on.
--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
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Posted by Joseph Meehan on June 14, 2005, 7:17 pm
lelson@bigfoot.com wrote:
> 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?
Your driveway may be expected to support a truck, your garage will not
likely ever need to.
--
Joseph Meehan
Dia duit
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Posted by Bob Morrison on June 14, 2005, 8:13 pm
In a previous post says...
> 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?
>
>
For residential structures, I always recommend a 5-inch UNREINFORCED
slab on a 6-inch compacted gravel base. Sawcut or tooled crack control
joints every 150 square feet max.
Unreinforced = no welded wire fabric, no rebar, no fibermesh
No amount of reinforcing will prevent cracking. The only thing that
will do that is pre-stressed or post-tensioned concrete.
--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
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Posted by SteveB on June 15, 2005, 4:00 pm
> 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?
>
Quoting from my recently purchased "Pocket Ref" book, the recommended
thickness for driveways is 6 to 8 inches. Garage floors are 4-5 inches.
Putting in a driveway is no small chore. Or expenditure. I tend to make
things stronger and thicker than the minimum. A few hundred bucks spent now
could save you some major work and expense later. And, making the forms a
couple of inches thicker now is no big deal. Materials can be taken out, or
the forms merely made a little higher.
Think long term.
DO IT ONCE. DO IT RIGHT.
Steve
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Posted by on June 15, 2005, 10:43 pm
SteveB wrote:
>
> Think long term.
>
> DO IT ONCE. DO IT RIGHT.
>
> Steve
Steve...what state do you work in?
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