Debate: vapor barrier under concrete driveway to avoid cracking?
My landscape contractor plans to install a 10 mill vapor barrier on top of the base rock for our new concrete driveway. He claims that in his past jobs that used vapor barriers, he got no cracking in the concrete driveways.
My soils engineer was skeptical, and said that he thought that with the large amount of water we get in our area, and the silty clay ground, that it would be better for the water to reach the concrete surface.
Who is right?