Jul 19, 2010· I've found glass, wire, nails, etc..in some construction sand. Call to the yard and ask them what type of sand they recommend for a chicken coop. I just went and looked at it. I chose the coarser sand. It still has a lot of finer sand mixed in but it's easier to rake up the poo. The finer stuff will sift down and the birds will dig for it to eat.