Re-bonding Flagstone to Concrete

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  #1  
Old 04-29-19, 10:27 AM
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Re-bonding Flagstone to Concrete

I have concrete front porch steps with the treads being flagstone. One piece of flagstone has come loose from the underlying concrete. Are there any simple ways of re-attaching it?
 
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Old 04-29-19, 04:10 PM
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What's your idea of simple? You can carefully chip off the mortar from the steps and stone. Then re-mortar and stick it into the same spot it was before. Be careful with the new mortar to not get it on any of the stone or steps. If you do have a mortar accident thoroughly wipe off the surface with a damp cloth several times.. You want to remove all the cement before it cures and leaves a white residue.
 
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Old 04-30-19, 04:47 PM
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Thanks. I was just inquiring if a cement product or mastic was proper for this task. The flagstone has released cleanly from the underlying concrete. Pretty wet underneath so would have to dry for a few days before re-attaching. What is the proper exterior mortar product?
 
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Old 05-01-19, 04:48 AM
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You don't need the area to dry. In fact you might actually want to wet the old concrete before you apply the new thinset.

First, you do need to remove all of the old thinset. That will make sure there is room for the new without the tile being higher than the others. Then re-set the tile in thinset. I would use a latex modified thinset which is available at any home center or tile store.
 
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Old 05-04-19, 06:30 AM
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Thanks, Pilot. I always get good advice here.
 
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