Plaster Bathroom Ceiling

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  #1  
Old 01-31-14, 01:44 PM
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Plaster Bathroom Ceiling

Hi,

The plaster around the exhaust fan is cracking and separating from the gray material above it. I was able to remove about 2 sq ft of plaster with a putty knife. The plaster looks to be about 1/16" thick. The gray material is solid and not sagging. Can I apply new plaster over the existing gray material? The house was built in 1955. Thanks for any advice.

Steve
 
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  #2  
Old 01-31-14, 01:58 PM
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What is the existing gray material? You may be able to use joint compound if it's only 1/16".
 
  #3  
Old 01-31-14, 02:17 PM
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I assume the grey is the 'brown coat' a pic or two might clarify - http://www.doityourself.com/forum/el...-pictures.html
I've always used a setting compound like Durabond to make plaster repairs. It's more diy friend than plaster and tougher than regular j/c.
 
  #4  
Old 01-31-14, 02:36 PM
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The gray material has a texture of rough cement. I don't known what it is called.
Looking up along the exhaust fan housing I can see wooden slats that appear to be imbedded in the material.
 
  #5  
Old 01-31-14, 02:39 PM
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That's the brown or base coat.
 
  #6  
Old 01-31-14, 02:43 PM
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How did it get its name of "brown coat"?
 
  #7  
Old 01-31-14, 02:46 PM
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Usually it's brown in color, I assume the plasterers that did you house used a slightly different mix which caused it to be grey instead of brown.
 
  #8  
Old 01-31-14, 02:56 PM
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I checked out the Durabond website. Would DUREX Ceiling Coat work?
 
  #9  
Old 01-31-14, 07:47 PM
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Gypsum plaster has different colors depending on where the gypsum was mined.
Some is pinkish and some is grey.

As plaster sets it turns brown compared to its fresh color. I think that is why t is called the brown coat.

But the coat before the finish coat, usually the second coat, of stucco of Portland cements plaster is also called the brown coat and it is not because the stucco changes color as it sets.
 
  #10  
Old 02-02-14, 06:03 PM
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I ended up getting a small bag of sheetrock 90 to do the job. I want to thank everyone for their help and explanations. It was greatly appreciated.

Steve
 
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