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Old 06-29-2004, 02:28 AM   #1 (permalink)
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How much would a cement slab for a 30'x30' shop on average cost to have poured? (basic shop no lift)
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Old 06-29-2004, 03:28 AM   #2 (permalink)
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I'm pouring my own, so it's only costing me for the concrete and the tool rental. Go here to calculate concrete amounts, then factor in price (if you are doing it) or price per yard (if someone else is doing it)

http://www.concretenetwork.com/concr...calculator.htm
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Old 06-29-2004, 07:29 AM   #3 (permalink)
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I imagine it varies depending on where you are, but in my area 4" reinforced concrete currently runs $2-$3 per square foot (materials and labor), so $1800-$2700 in your case.
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Old 06-29-2004, 07:43 AM   #4 (permalink)
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30' x 30' = 900sf
900sf x 4"(thick) = 270 square feet
270sf / 27sf/cuyd = 10 cubic yard.

A cubic yard of concrete runs about $150-175 for standard 3500psi concrete

Thats 150-175$/cuyd x 10cuyd = $1500-1750.00

Add about 10% for wire fabric reinforcing and 5% for labor to install and 5% more formwork for the slab and 2-7% for overhead (to truck the concrete and do billings and such) and then profit. (If it is the busy season some Contractors like to take the raw material costs and double it to get actual costs for installation due to working a lot of summer overtime and dont forget the prices of concrete may vary in your area...call your local concrete yard and get a good price. Also call your local hardware store and get pricing on your welded wire fabric and 2X6's for formwork)

so the 1500-1750
will be somewhere in the neighborhood of
1875 to 2250.

Obviously if you want rebar in lieu of wwf and floor drains and special finishes or anything better than basic concrete (consider integral fiberglass reinforcing) the costs will be more. Also, if you are pouring a foundation consider that as well or at least turn the corners down as that is where a mouse will live, which when he dies a rabbit will borough, and then a groundhog and before you know it you will have voids under your slab and will be wondering why it is cracking. Consider putting a foundation under your slab to at least frost depth to avoid any movement and varmits from undermining your investiment.
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Old 06-29-2004, 08:33 AM   #5 (permalink)
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I just did some concrete work last week @ $82 a yard delivered, for 3500psi and that included a surcharge for a load under 4 yds. $150-175 a yd WOW, thats insane I figured yours on an average of 5" thickness, that would require 14 yds. A 150'roll of 6x6 wire is rougly $100. So at least in my area youre looking at Over $1200 in materials, Ive found that when it comes to construction stuff like this as a rule you can almost double the cost of materials to come up with a completed cost by a contractor. A buddy of mine just had a 24x36 6" slab poured for his garage at a cost of $2700. Ive got some experience with this stuff as well as some friends so Im inclined to do my own next yr when I build my new garage.

edit: Hey I just about repeated skunked... should have read his whole post..lol
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Old 06-29-2004, 08:55 AM   #6 (permalink)
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I just poured a 28X28 slab, 6+ inches thick, &it was 5 yards
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Old 06-29-2004, 09:04 AM   #7 (permalink)
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Quote:
I just poured a 28X28 slab, 6+ inches thick, &it was 5 yards
Do you mean 15 yds?
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Old 06-29-2004, 09:06 AM   #8 (permalink)
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sorry man, but a 28 x 28 x 6" slab would be 14.5 yards of material. The math don't lie..
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Old 06-29-2004, 10:02 AM   #9 (permalink)
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DO NOT fail to rebar a slab that big.
Don't forget to add for the depth of the footingss around the perimeter. Usually twice the depth (at least) of the thickness of the whole floor. Compact to area of the slab.
And, can you form this up yourself?
Be advised, if you pour this on a saturday, YOU pay the premium for the drivers overtime,
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Old 06-29-2004, 10:11 AM   #10 (permalink)
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A slab that size should have joints. You should have atleast one in each direction. If you do not use joints you will have an uncontrolled crack in the slab.
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Old 06-29-2004, 10:56 AM   #11 (permalink)
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Don't forget soil condition, its key! If your soil move arround a bunch you need to add beams or piers. That will drive up the costs. I'm in Dallas, our soil is all over the place, from good to bad.
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Old 06-29-2004, 11:06 AM   #12 (permalink)
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I paid $4,200 for my 4" X 30' X 40' pole barn floor one year ago. That included the rat wall, rebar, and vapor barrier. Also included was a 8" X 8' X 14' section for my lift. 3,500 psi.
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Old 06-29-2004, 12:47 PM   #13 (permalink)
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Quote:
slab that size should have joints. You should have atleast one in each direction. If you do not use joints you will have an uncontrolled crack in the slab.
Actually, they don't do a lot of that this far south.
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Old 06-29-2004, 03:27 PM   #14 (permalink)
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I'll let you guy's fight over the math, but here's the deal in my area.(It will vary depending on your location. I have a medium size constuction co and we pour a lot of concrete.
Over 3 yds-$78.00 yard+tax-no delivery charge if under 1 hour pour.
Labor(this is what my subs charge)0-15 yds slab pour=$500 for trowel finish/$650 for trowel/machine finish
I would highly recommend a machine finish/sealed if you are going to be spilling any thing on it.
As far as wire & control joints, we've been pouring with fibermesh additive here in New England for 20 years and the only cracks we've had came from pouring over unstable soil. Put down 2" of 3/4 stone and compact and you won't have any problems. Wire mesh isn't for preventing cracks, it's for holding concrete together if it does crack.
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