I'm building a shed. Part one is complete, preparing the site for a slab;
it's leveled, graveled and framed. We're thinking to do the pour later this
A friend of mine, who does concrete for a living, is helping with this part.
I'm afraid that he might not be a professional, just one of those amateurs
who gets paid, because he's telling me that we don't need any reinforcing
steel in a shed slab. Except that at 12x20, the slab is big enough for a
garage. Although I'm not building a garage (a garage needs a permit, and a
shed does not), far down the road it's possible that someone will try to use
it as an RV parking pad or something.
Am I right to think that we should lay in some steel before pouring? The
expense would be minor, and I can't think of any other downside.
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On Mon, 18 May 2009 02:04:24 GMT,
The most important part is having a solid base under the slab. If you
disturbed the natural soil did you compact it?
If I was building on a slab I would make it 8" to a foot deep on the
perimeter 12" wide with 2 rings of continuous rebar and wire mesh
across the slab.
bend up a short 90 several inches above the slab from a full length
rebar that is tied to the ring, for a ground electrode.
Flat slab, or stem walls to set the shed on? I hate sheds (even metal
ones) on a flat slab- the floor is always wet. At a minimum, I'd set
J-bolts in the slab to hook a row of block on, or at least tie down the
sill plate with.
And yes, you need at least a monolithic (thick slab edge) footer with
rebar, and 4" fabric across the field of the pour. Don't forget to set
it up on rocks or chunks of brick or something, so it is in middle 3rd
of slab cross section. (They sell fancy little notched blocks of
concrete to wire them in place, but about anything that won't rot will
work.) If you think you or next owner may actually use this shed for
heavy stuff, best to put a proper footer down past frostline. It isn't a
patio- it has a building sitting on it.
If you live where the ground freezes you need to take special precautions.
I don't know what they are, but it only makes sense.
On May 17, 10:04 pm, email@example.com wrote:
You should double check the permit information. Typically it's the
size of the structure that determines if it is a shed or not.
Building departments aren't usually fooled by someone calling
something by another name to wriggle out of securing a permit, and
they get kind of touchy when they have to prove it to you.
As far as the steel, if you have poor soil conditions and drainage,
and aren't going to do proper subgrade preparation, the rebar will
help a bit if the rebar is of sufficient size and the slab is of
sufficient thickness. If you take care preparing the subgrade the
rebar doesn't really do much and won't prevent cracking.
Google newsgroups for: bob + morrison + slab if you want to read up
on it. Bob passed away a while back and his depth of knowledge is
sorely missed. If your contractor friend disagrees with anything Bob
wrote, well, your friend is wrong. Simple as that.
That's the third silliest thing I've read today.
*I concur. I would add steel, a moisture barrier and insulation. If you
are planning to bring power to the shed I would stub up a pvc conduit to the
interior wall. As someone else suggested stub up a piece of rebar for
bonding or run a solid #6 copper into the slab and connect it to the rebar.
On May 17, 9:04 pm, firstname.lastname@example.org wrote:
You are lucky on one count , my county requires a permit for "sheds"
bigger than maybe 8`x8` How about your tax increase for that mini
shed you are building that is not a garage, I bet it will happen. For
that size reinforcing the concrete is a good idea.
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