Whats the minimum crusher/mot and grit sand that
hi 1st of all depends what the grounds like underneath now if the sub base is solid then 100mm minimum of type 1 /crush and run should be used with a taram membrane which allows water through but stops it coming back through as for grit sand usually 40mm is the prefered depth i have 30mm screed bars so i use 30mm the less the better
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