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shed slab
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greetings, i would like to have a 10x10 slab poured for a shed. what
would be the recommended thickness? and how much concrete(yardage) would
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Did you have math in school? This is a 6th or 7th grade problem Hint: 27
cubic feet to a cubic yard
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it take? also, would it be a good idea to buy the concrete in bags and
mix it myself or would the concrete start to set before all was mixed.
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Call for the Reddi-Mix truck. Mixing by hand is tedious, heavy, and must be
done quickly and it is a lot to do by the bag. If you have no experience
with pouring concrete, get at least one experienced person to help with
screeding, floating, etc.
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L = length of slab
W = width of slab
D = depth (thickness) of slab
V = volume of concrete needed (cu-yds)
NOTE:
1 ft = 12 in
1 cu-yd = 27 cu-ft
Make sure that you are working in the same units for L, W, and D... If
you measure L & W in ft and D in inches, divide D by 12 to get the
equivalent inches (i.e. D = D / 12)... In this case, the formula would
be:
V = (L * W * D) / 27
If you measure everything in inches, you can use the following
formula:
V = (L * W * D) / (36 * 36 * 36)
Which is equivalent to:
V = (L * W * D) / 46656
Parentheses added for readability, not because of being mathematically
necessary...
Personally, I would put a footer around the slab... Might not be
really necessary, but I figure that as long as you're going to do
something, you might as well do it right... It's not like you're going
to want to be moving the slab, right? I would use a footer that is
12-18 inches deep on the edge, at least 6 inches across on the bottom,
and sloped at a 45-60 degree angle up to the rest of the slab...
Awh, 'ell... I've gone and overengineered it something *again*...
Never mind...
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thanks cj
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Four inches, unless you're installing heavy machinery.
10' x 10' x 1/3' = 33 1/3 cubic feet, or about 1.25 yards.
You may well find that hiring someone with a small
cement trailer to come pour the slab is just as
cheap as buying the 56 bags of ready-mix you'd need,
retail.
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Small jobs are just about as expensive either way you go unless you can find
a small hauler. Around here it is about $ 80 per yard delivered but you
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I bet yoiu haven't bought any lately. I bought 27 yards in Feb at the
"inside" price and it was $100./yd. Most contractors are paying a buck
twenty for 3000# gravel
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have to get a minimum of 4 yards or atleast pay for that ammount even if you
only want one or two yards. The dry mix at the box stores is about twice as
much as the delivered mix so you have to decide which way to go for small
ammounts.
If you have to mix all the bags one or two at a time then it will take you
about 2 to 3 hours time per yard. Allow for plenty of time.
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If you can find someone that can do 1 yard, but not
1.25, then the resulting slab would be around
3 1/4" inches, which is probably workable, and still
better than trying to do it yourself with bag-mix.
Esp. if you've got a couple wheelbarrows full of
clean, smaller-than-fist-sized rocks to bulk it
up with.
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Quick shortcut... 81 sq/ft to the yard at 4" thick.
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