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Need help converting

Postby Vito » Thu Aug 07, 2008 10:01 am

Ok my wing of the driveway that I want concreted measured 36 foot long x 12 foot in width then I have a short pad for my garbage cans to go and that measured 5 foot wide by 7 foot long. Questions How many yards of concreate do I need. I need a math guy for some help here :D 8) :lol:
Vito
 

Re: Need help converting

Postby Guest » Thu Aug 07, 2008 11:04 pm

Vito wrote:Ok my wing of the driveway that I want concreted measured 36 foot long x 12 foot in width then I have a short pad for my garbage cans to go and that measured 5 foot wide by 7 foot long. Questions How many yards of concreate do I need. I need a math guy for some help here :D 8) :lol:


How thick? I'll assume 4" = 1/3 foot

Area is 36 x 12 = 432 ft² and 5 x 7 = 35 ft²
You might get away with less thickness in the can area, but it's small and probably not worth the effort. Total is 467 ft² x 1/3 ft = 155.7 ft³. At 27 ft³/yd³, that's 5.77 yd³ (use 6).
Guest
 

Postby darrenjay » Sun Dec 07, 2008 7:21 pm

hi. i am trying to find out how much concrete i would need to build a base for my shed.

it will be 20'x10'x4in

so how many ton of concrete will i need.
thanks
darrenjay
 

Postby Dirtman » Sun Dec 07, 2008 10:22 pm

darrenjay wrote:hi. i am trying to find out how much concrete i would need to build a base for my shed.

it will be 20'x10'x4in

so how many ton of concrete will i need.
thanks


20 x 10 x (4 / 12) = 68 ft^3. Divide by 27 = 2.52 cy^3. I would add 10% for sub-grade irregularities, which brings the total to 2.77 cy^3

Most concrete plants have a 3 cy^3 minimum. Less than this quantity is called a "short load" and you will still be charged for 3 cy^3, so you might as well just get the 3.

Ready mix concrete is ordered by the cubic yard instead of tons but as you asked for the weight, it's approximately 4000 pounds yd^3 = 6 tons.
Dirtman
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