Q&A for How to Figure Concrete Yardage

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I have to pour a concrete slab 15' x 11' x 10" thick. What is the correct math?

Community Answer

15 x 11 x (1 / 6 * 5) = 137.5 cubic feet 137.5 x 0.037037 = 5.092593 cubic yards

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Question

Why do I not get the same yardage using the two methods?

Community Answer

There are two different ways to get it, but they will both end up equaling the same thing. Check your math and that you've converted any measurements to the units required.

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Question

How can I calculate cubic yards of an area that is shaped like a 'T'?

Community Answer

Divide it into two separate rectangles and calculate the horizontal part of the T first, and the vertical part of the T second. Then add the amounts together.

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Question

I am making a horseshoe pit. Both pits are 5'x4'x8" deep. How much sand do I need, and how much will it weight?

Community Answer

You will need 1.5 tons of a washed river sand or 1 cubic yard.

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Question

Can I pour and level cement on top of a 30' x 6' porch that is unlevel and cracked?

Community Answer

You may be able to but you must answer questions first: Is the sub-grade stable? Are the cracks occurring in a uniform pattern? How thick will the topping layer be? Is the underneath layer deteriorated? Without knowing this information your question can not be answered appropriately, the stability and condition of the under-layer has everything to do with a good answer. I will say that a slab in this configuration needs control cracks formed in it and a bonding cement should be applied between the two layers.

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Question

If I want to mix sand with stone and cement, how many bags of each should I use?

Community Answer

By volume you need 1 cement, 2 sand, and 3 cement for a good general purpose mix. Only add enough water to make a consistent stiff mix. Concrete needs to be placed not flowed into place. If it flows, the mix will not stand the test of time.

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