I’ve dug the footings for my 10 by 6 foot aluminium and glass greenhouse. They are for a 6” deep concrete foundation around the perimeter i.e. not a slab. Anyway, I have countless buckets of flints from my garden, many of them are 2 to 4 inches across, and I want to get rid of them. Can I pour in an inch or two of concrete then lay a line of larger flints down the middle of the trench, followed by the rest of the concrete? Or put some in the base before the pour?
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