I currently have a gravel driveway that I would like to upgrade to concrete. It has had several layers of gravel over the decades and been driven on for at least 50 years. Any concrete slab on grade I have ever designed has always included a gravel base over the subgrade. However, I am thinking about omitting the gravel base and just putting 6" of concrete over the excavated subgrade. A contractor has pointed out that the existing drive subgrade will certainly be as firm and probably firmer than a new base that would have to be installed and compacted. I live in NW Pennsylvania so frost heave is a consideration. But would a new 6" gravel base really be effective in limiting any potential frost heave? Thoughts anyone??
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