Can I put stone over a concrete slab patio?
I live in Michigan and have a concrete slab as a patio. I would like to put slate or blue stone on top of it. Can this be done?
Submitted by LVR081

You should have no problem putting stone over concrete. If the slab has a rough texture it will allow the mortar you use to set the stone to adhere properly. If it is smooth, you will need to roughen up. A pneumatic hammer with the proper attachments will do this.

Answered by
Community Answers (2)

We're in the Chicago area around here and I would not recommend trying to mortar a natural stone over a concrete slab. The freeze thaw will eventually separate the mortar from the concrete, no matter how much prep you do. You are better off laying the new stone in a sand bed over the concrete much like a standard paver patio. The concrete is a great base for the sand. The down side is that you have to sand it every couple of years but at least it won't crack up. Joel @ The Renovation Place.
Submitted by JoelRenovationP