For industrial slabs and maximum strength, it is very common to put a layer of poly down over the sub base. It takes quite a bit longer till you can get at it with a power trowel, but you get a much better product. I see many crews pouring driveway and garage slabs that don't even wet down the subgrade prior to pour. Rarely if ever see them use a sealer or poly on top after the pour. I've done this for every home I've had and the results speak for themselves.
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