We are having a baby fence put in over our travertine patio. The pavers are laid over sand only, no concrete. They are drilling holes down through dirt and running sleeves down. Anyone here have this setup? Any problems with pavers moving etc? I was told by manufacturer that concrete needs to be poured underneath pavers to anchor but builder says "they have done hundreds" the sleeve method. Of course, that doesn't mean it worked out for those customers. Looking back, I would have poured a footer myself all the way around the pool.