I used 1/2 Homosote over 7/16 OSB it works great easy to fill gaps with paintable caulking if and where needed GRJ is correct with his point about cutting and the use of a good shop vac. It holds screws much better than the foam panels and I also just use an awl for planting trees and other scenery items and for streams and stuff like that just curve with a sharp knife.
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