If you imbed them in concrete, a total of 5" should work, 7" for driveway or walk crossing drive. Slope the 1/4 inch per foot toward the road.

Larry2



---- [log in to unmask] wrote: 
> 
> 
> In a message dated 11/13/2008 9:07:57 A.M. Eastern Standard Time,  
> [log in to unmask] writes:
> 
> Ralph; I am with John on this one; 
> any long stone or  big square stone .
> .all it takes is one piece of gravel to find its  balanced  fulcrum 
> underneath and she will snap like a candy bar   when stood on (been there done that) 
> The substrate or the setting bed is  the key; 
> Outdoors 
> 3" rock dust; (with fines)    or rock  dust and hydraulic lime  wet to the 
> consistency of beach sand but
> for  heavy traffic areas (working surfaces )  
> ; you cannot have big  joints; you want tight joints 
> This is nice, but my question was how thick the slabs  should be?  Or are you 
> saying it doesn't matter?  Which makes no  sense to me.
> Ralph
> 
> 
> 
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