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Old 09-30-2010, 07:06 PM   #1
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Plaster and blue board?

Working in an closet in my house built in 1950. Had to cut open the wall, and found that I don't have plaster and lathe as expected. Instead, I found what looks like thin drywall (blue board) with a coating (a little less than a quarter inch) of gray stuff and then a very thin layer of white stuff (plaster skim coat?). Anyway, my question is about the gray stuff. Is that a layer of plaster over the blue board and then the white stuff is a plaster finish coat?
Pic below:

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Old 10-07-2010, 09:25 PM   #2
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Plaster and blue board?

Yep: http://www.nps.gov/history/hps/tps/briefs/brief21.htm


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