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<blockquote data-quote="Obi-Wan" data-source="post: 173397" data-attributes="member: 709">If your buddy has the experience with stamped concrete why are you not asking him for advise?&nbsp; I prefer to stay away from sand on exterior concrete because it has a tendency to wash out. I feel the crushed concrete is the way to go if possible but can add expense and you can pack it with a plate compactor, I assume this patio is not that large and should not be a terrible expense.&nbsp;&nbsp; Make sure you get all the vegetation &amp; top soil&nbsp; from below the slab area prior to placing the fill.&nbsp;&nbsp; The concrete will determine when it needs to be cut, many times cutting the next day is to late and the stress cracks have already formed.&nbsp; Multiple factors go into the curing rate of concrete from the mix design, slab thickness,&nbsp; wind, sun, shade, temperature, soil moisture content.&nbsp; Cut the slab as soon as you can get on it with a soft cut saw and does not spall, cuts should be 1/3 the thickness of the slabAre you going to install rebar?&nbsp; #4 bar 24&quot; OC&nbsp; will add approximately $ .25/sq ft and while structurally it is not need it will help with elevation separation when the concrete cracks, and it will</blockquote>

[QUOTE="Obi-Wan, post: 173397, member: 709"] If your buddy has the experience with stamped concrete why are you not asking him for advise? I prefer to stay away from sand on exterior concrete because it has a tendency to wash out. I feel the crushed concrete is the way to go if possible but can add expense and you can pack it with a plate compactor, I assume this patio is not that large and should not be a terrible expense. Make sure you get all the vegetation & top soil from below the slab area prior to placing the fill. The concrete will determine when it needs to be cut, many times cutting the next day is to late and the stress cracks have already formed. Multiple factors go into the curing rate of concrete from the mix design, slab thickness, wind, sun, shade, temperature, soil moisture content. Cut the slab as soon as you can get on it with a soft cut saw and does not spall, cuts should be 1/3 the thickness of the slab Are you going to install rebar? #4 bar 24" OC will add approximately $ .25/sq ft and while structurally it is not need it will help with elevation separation when the concrete cracks, and it will [/QUOTE]

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