Hi pgrennan,
You don't have to use an adhesive for gravity wall units, but it's a great precaution. I would consider putting a dab of glue on every other or every third block, mostly on the last couple of courses. I always clue my top course if I dont have caps, and if I do have caps, I always glue my caps. It's safer.
George Nicula
Brickways, LLC
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Member Since
03/10/2004
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