Posted: 22/08/2016 at 17:24
Not sure what you'd need the sand for Chris, or the membrane really. The grids have to go into the ground a bit, so the membrane would prevent that. If you're removing the turf, the grids would sit into the clean soil. Then gravel on top.
If you don't use the grids, you can simply lay membrane on the soil and put the gravel on top. Either way, you need a retaining edge of timber or brick, or similar, to stop the gravel travelling elsewhere.