A.Steve Thomas, who worked for 15 years in the stucco and masonry industries, responds: First, in my opinion, you’ve done nothing wrong in not turning the corner with your lath. I’m not familiar with your mix, but the work looks very proper, given the photos you provided. The north-facing porch (with a 6-foot bottom chord and no “seasonal” sun hammering) as well as the chimney escaped scot-free. So you have to look at conditions that exist only on the south (sunny) side.

Your notes indicate that the stonework was done in the spring, so I assume that the framing took place over the winter months, when it was cold and snowy.

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