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Posted by on June 14, 2005, 4:28 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?
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Posted by G Henslee on June 14, 2005, 4:30 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?
>
4" is standard for a residential driveway, gge slab as well as the house
floor.
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Posted by gary on June 14, 2005, 4:31 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?
>
What about beams to support the walls? Stirrups/vapor barrier?
Rebar/mesh? These are equally important IMHO.
Gary
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Posted by John Willis on June 14, 2005, 4:55 pm
On 14 Jun 2005 13:28:13 -0700, lelson@bigfoot.com 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?
Four inches is sufficient for the floor of the garage. Of course you
will still need beams around the perimeter of the garage (perhaps more
in the center, depending upon the complexity of the design), a sand
pad to control expansion and contraction under the foundation, a
moisture barrier, and reinforcement steel, properly supported so it is
in the center of the concrete instead of sitting on the bottom against
the moisture barrier where it does no good whatsoever.
If I were building my own garage, say a 20X24, single story, where we
live, I'd most likely dig perimeter beams about ten to twelve inches
wide, at least a foot below grade and sixteen to eighteen inches would
be better, and possibly dig piers on either side of each corner as
well. Otherwise, standard pad design, moisture barrier, and steel.
If I got fancy and wanted a two story garage then the beams would be
wider and deeper and there'd be more piers. Otherwise the rest would
suffice, even the 4 inch floor. But that's where we live where the
soil has an unbelievable amount of expansion and contraction. A slab
in this area, built to minimum standards, even just for a garage, will
fail unless you take extra precautions to keep the soil around the
building stabilized by maintaining even moisture content year 'round.
--
John Willis
(Remove the Primes before e-mailing me)
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Posted by SQLit on June 14, 2005, 5:55 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?
Just what are you planning on driving on a 5 inch slab? A Fire Truck?
4 inches is standard, usually 3500 psi concrete. Some use rebar some use
steel mats. Saw cut every 10 feet for expansion.
Foundations are broken up into parts called footings and stem walls. The
thickness is directly proportional to the height of the building. Where I
live the footings are minimum of 12 deep x 18 wide about 18 inches below
grade. That makes the stem walls 10-12 inches wide and 20-24 inches high.
If you live in frost country, other considerations are necessary.
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