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I have a large section of wall that was recently framed in that butts up to an existing wall that has the original plaster (rock lath + plaster + final coat). The rock lath appears to be about 1/2 or maybe 3/8? and the plaster is another 1/2 inch or so making the total wall thickness about an inch. I'm trying to figure out the best way to match up the existing sound plaster...
My plan is to cutback the plaster to the center of studs and place 1/2 blueboard (or equivalent???) and apply a brown coat and a finish coat totally about 1/2+ of plaster. Does this sound like a solid plan or an overkill? Can someone recommened a better way to match up the existing plaster which seems to vary between 7/8 and 1 1/8 I'm open to suggestions? Maybe I should use 5/8 blueboard, or equivalent? I'm also looking specifically for help in the selection of the plaster mixes to use for the brown coat and the final coat. Specific product choices would be helpful.
For an entirely new room add-on, I'm thinking the blueboard + veener plaster looks like a nice in between option instead of having to plaster the entire new room, but still keep the old charm of the plaster. What product is used for the plaster, and what is the maximum thickness of this material can be used? I understand it's normal to apply about 1/8 of an inch or so.