Q: How
thick should concrete be?
A: 4 -5 inches for residential, 5 - 6 inches for commercial, 6 - 8 inches
for industrial.
Q: What
is the most critical factor for a good concrete job?
A: The amount of water added to the concrete determines the strength of the
concrete.
Q: Why
would a contractor add water to concrete?
A: A contractor would add water to concrete to make the concrete easier to
spread.
Q: How
much Portland cement is in a yard of concrete?
A: A five sack mix would have 500 pounds of Portland cement.
Q: How
much reinforcement steel should be in a concrete slab?
A: It depends on how strong you want your concrete and how much you can spend.
I usually recommend 3/8 "or ½" rebar on 1 to 2 ft centers.