Whats the minimum crusher/mot and grit sand that should be ...
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