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Since you have an asphalt driveway, you are definitely on "thin ice". The reason being is that asphalt pavement is not strong, but it strong enough to spread the load to base under it. More thickness hepls somewhat. If the base is not good or compacted well enough or is moist the strngth goes down. This is in contrast to a rgid pavement, like concrete that spreads the load out to a much larger area (sort of similar to a lot of sheets of 3/4" plywood).
As far as I know there is no "code" about the pavement thickness, the base thickness and compaction or the subgrade quality. There are some non-binding "acceptible standards" or just installation guidelines.
Call the aggregate supplier and they can give you suggestion since they run into this frequently.
Dick
As far as I know there is no "code" about the pavement thickness, the base thickness and compaction or the subgrade quality. There are some non-binding "acceptible standards" or just installation guidelines.
Call the aggregate supplier and they can give you suggestion since they run into this frequently.
Dick