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Yeah, what the manufactures claim are almost always based upon their own testing. (we however, send our products to an independent lab for testing on our pavers and retaining walls.) When I wrote the thing about using less base material, that was what the manufacturer states. That being said, I would still recommend and use the same amount of base as you usually use and add the fabric/grid, whatever, in as a bonus. There isn't really such a thing as too much base.
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Assumption is life's lowest form of knowledge.
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