Gravity wall question: blocks with adhesive vs blocks with lip
I will be installing a 1-ft gravity wall. The guy at the stone yard said it is harder to install the blocks with no lip, because you have to use adhesive. He steered me to blocks with a lip. When I asked why adhesive made it more difficult, the only response I got was "they slip".
Granted, squeezing some adhesive is an extra step, but I dont see why that should be a problem. However, this is the first wall Ive attempted, and I dont want to take on too much. Can anyone advise me on this?