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davemac,
you shouldn't need any more extensive a base than you'd do for a patio, unless the subsoil is very poor/spongy. also, i'm not sure why you'd need perf pipe behind for drainage. i suppose it could be considered good 'insurance', but outcropping stone, unlike SRW, has very little chance of stopping water behind it and creating hydrostatic pressure. i rarely use them with natural stone retaining walls.
jim
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