M
Mike F
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Not sure if this should go in the landscaping forum, but...
I will be building a large, multi-level flagstone patio this summer. The flagstone will be set in a mortar bed on top of concrete pads. I'm scratching my head now wondering about the expansion joints in the concrete pads below the flagstone. You put those expansion joints in because concrete will crack, there is no avoiding it, so you want it to crack in the expansion joints, however when you are going to put a mortar bed and flagstone on top of the pads, what do you do so that those cracks in the concrete don't end up cracking the mortar around the flagstone?
The only thing I have even heard about is to lay a 6 inch wide strip of roofing felt over the joints and then the mortar bed. Is this the answer?
I will be building a large, multi-level flagstone patio this summer. The flagstone will be set in a mortar bed on top of concrete pads. I'm scratching my head now wondering about the expansion joints in the concrete pads below the flagstone. You put those expansion joints in because concrete will crack, there is no avoiding it, so you want it to crack in the expansion joints, however when you are going to put a mortar bed and flagstone on top of the pads, what do you do so that those cracks in the concrete don't end up cracking the mortar around the flagstone?
The only thing I have even heard about is to lay a 6 inch wide strip of roofing felt over the joints and then the mortar bed. Is this the answer?