Q: I'd like to build a backyard concrete patio to replace a rotting
deck. The patio would be about 18 by 10 feet. How do I figure out how
much concrete
to order?
A: Concrete is sold by the cubic yard, and there's no real secret to
determining volume. Like anything else, it's measured as length times
width times height.
Remember, 1 cubic yard is 3-by-3-by-3 feet, or 27 cubic feet. And slabs
are generally poured to 4-inch (0.33-foot) or 6-inch (0.5-foot) depths.
It sounds
like you know your length and width, so for a 6-inch-thick slab, you get
18 x 10 x 0.5 feet = 90 cubic feet. 90 divided by 27 is 3.33. So you
would need
to order 4 cubic yards of concrete for the slab.
By the way, if you're doing this yourself, you should also
use a gravel or crushed-rock base, rebar reinforcement, and provide an
expansion
joint against the foundation. And don't forget to slope the slab away
from the house.
Does this sound correct, fellow members.
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