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I have a short block retaining wall and some of the top caps are loose. How does one secure them to the top blocks?
 

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Any I've ever seen used morter. Just mist down the block so it does not suck out all the moisture from the morter to quick.
 

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If the wall is a segmental retaining wall built with interlocking block and no mortar or a concrete footing, use some globs of silicone to allow for seasonal movement.

If it is a rigid retaining wall built with mortar and a concrete footing, use caps attached with conventional mortar.

Dick
 
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