Yes, you can use panels under patio with most pergolas. Some very heavy pergolas require footings. In this case, build around footer.
I would think not. My brick patio has started to shift after 2 years with professional installation. I bet you need pavers above the base sheets
Yes you can use these for porcelain tiles, paving stones, natural flagstone, Turf, sheds and more.
No, I don't think so. The sand is just used to level the surface. Don't forget your weedblock.
Yes, you can use the panels for the base. Make sure to use paving stones over the panels were the polls will be. If you plan to cover the panels with much, sand or decorative stone, add an additional layer of fabric over the top of the panels. Questions, call PaverBase customer service (Tim) 813.431.8259
Home Depots Box of 20 panels cover 100 sq ft
I would not use it for a retaining wall. If you are building a concrete block retaining wall you need to dig a trench and place the first course at least half underground on a compacted gravel base.
Yes, that is what they are made for. Unless you are meaning just lay these down and have a patio, then no. They slide all over the place, you have to put pavers on top of them.
No, you have to buy the edge restraint separately. I recommend putting the lip of the edge restraint under your pavers.