Masonry Adhesive


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Old 04-01-21, 10:29 AM
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Masonry Adhesive

I have a small (8" X 12") memorial plaque (looks to be made of slate) that has come loose from its base that looks to be sandstone. It is recessed into the base with a 1" border of the sandstone. The memorial will be outside in the weather year round. What adhesive should I use to reattach the plaque to the base? Please be as specific as possible, including brand and full name.
 
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Old 04-01-21, 10:31 AM
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You say "reattach". What was used previously? Did the back layer of slate come loose or is the previous mortar still attached?

Since you are attaching stone to stone I would use mortar.
 
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Old 04-01-21, 02:22 PM
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Some type of adhesive was used. It doesn't appear to have been mortar. I have attached pictures of the base and the plaque. Maybe that will help with diagnosing what was used or what should be used at this point.


 
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Old 04-01-21, 02:53 PM
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IMO any landscaping block adhesive would work. Loctite PL500 is one brand.
 
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Old 04-01-21, 03:31 PM
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Make sure it's a masonry or urethane construction adhesive, common liquid nails type adhesives do not last long in the the outside environment!
 
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Old 06-09-21, 12:22 PM
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Thank you. I will be sure to do that.
 
 

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