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Yeah this stuff is called Ground Guard by ACO. Dug the topsoil into some raised beds then double weed membrane, whackered 4” of type 1 aggregate, levelled 2” of sharp sand and then the grid which takes about 2” of pea shingle. Quite faffy compared to concrete tbh but I got given quite a pile and committed to it. I’ll be harvesting the rain so hopefully there won’t too much water run off to destabilise the edge.
@hugo7 cheers bud.
Frame eventually back together, I hate jigsaws.