Are there any advantages/disadvantages besides cost in using 2
coats
(base and finish - 3/8") vs 3 coats (brown/scratch/finish-7/8") hard
stucco.
I have never done the thin coat stucco.
There is a pre mixed portland product called
one coat stucco that is applied thin and
your scratch and brown can be done at the same
time. Although a portland cement finish
probably bonds fine, I have seen this done
with a synthetic finish. I have yet to see a
job done this way that doesn't look like the ocean, but I think that is
mostly because it is applied
by inexperienced people, like EIFS workers.
One reason I doubt I'll ever do this is there isn't
enough room to straighten the wall to make up
for irregularities in the framing or blocks.
Even with 3/4" it is necessary to fill in thicker
or thinner to kill the bumps and waves in the
wall. It isn't unusual to find framing that is
1-1/2" or more out of true. Also, I don't
think you can beat a portland cement finish.
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