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I need to fill in alot of area next to the driveway and have access to alot of rock and some old concrete. Can I port 4-5 inches on top and let it bleed into the crevaces or am I better off just using crusher???

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Use crushed stone and compact it, definitely if it's outside. Drainage and weather, and any type of weight on it will expose weak points where the uneven subsurface is lying.

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  • +1 for recognizing uneven (and non-uniform) amounts of concrete will tend to crack.
    – Lee Sam
    Mar 5, 2019 at 1:01

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