I have used the search feature and have not been able to locate this topic. I am working with an architect that is insisting on me placing geofabric (or grid: he isn't sure which yet) in the base of my patio. He says that it should help prevent settling. His instructions are: 1. Install 3/8 to dust traffic bond in two two inch lifts (compacting in between lifts) 2. Install fabric 3. Install remaining two inches of base and compact. I really don't think that this will make that much of a difference but figure that it won't hurt. He is also eliminating the thin layer of mason sand that goes between the base and pavers and replacing it with TB dust (finest particles of crushed limestone). I would appreciate anyones view on these ideas. For the most part I think that architects just throw these things out to feel superior of something. Not all architects just the majority. Thanks in advance.