Pouring Concrete Over Crusher Dust

2015826pouring concrete slab on top of old slabthe original slab base of the bbq and partly over 30 year old solid brick paving over four inches of wacker packed crusher dustan i lay black plastic over the pavingslab and then pour my slab or should i dig up the bricks and crusher dust that is you need minimum 2 inch or 50 mm of.

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