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Here is something that I was recently told to try by a reputable conserv rep for a large retaining wall mfg. Before this guy went to the rep. side, he owned an install company for over 20 years all he did was walls.
He told me to get your compacted base as close as you would on any other wall and then he told me to put a (2-3" thick/width of the block) bead of mortar across the the base. Lay your base course in to the desired level, and let it set for 8-10 hours. He said that the mortar will become a natural extension of the block and you do not give up any structural integrity. He said on larger walls, a crew of 3 was doing 250-300' of base course a day. I have not tried it yet, however I will be trying it in a couple of weeks.
I could see the drying time being a pain on smaller jobs, but on longer walls the time savings would be huge. This has been the biggest estimate buster in the past for us.
Like I said, I have not tried it yet so I can't confirm for myself whether it works. The source is not somebody to give bad advice, I have seen a lot of his work and it is still in great shape after this many years.
Just a thought!
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Matt
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