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Is the depth of the sand and gravel standard or is it determined by other factors? if standard what is the standard. Also how do you determine the centers for the re-bar grid. Do you need re-bar for both floor and driveway? Also what size re-bar do you use, Is it the same for floor and driveway? What is the thickness of the poly. Is wire mesh exceptable for
use instead of Rebar?
I know I am getting into specifics but I want to know what I am talking about when interviewing contractors.
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