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Can you identify this ceiling material

Can you identify this ceiling material

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  #1  
Old 12-19-14, 05:05 PM
S
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Can you identify this ceiling material

Hello everyone,

Not sure what ceiling material this is in my garage (old 1920's row home in Philadelphia), but I want to take this down so I can insulate, then install sheetrock.

My question is, can you tell what this is? I don't want to run into any problems removing it (hoping it's not a material requiring abatement like asbestos).

I thought it could be plaster or some type of concrete or mortar because there are metal rails that makes up this ceiling.

Thanks.

From in garage:
Name:  garage ceiling.jpg
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Close up:
Name:  garage ceiling close up below.jpg
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Above garage (in between joists):

Name:  Above garage ceiling.jpg
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With flashlight to highlight:
Name:  Above garage ceiling 2.jpg
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Size:  26.5 KB
 
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  #2  
Old 12-19-14, 10:26 PM
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That looks like plaster over lath. I have no idea of the composition of the plaster though.
Another reader may have an idea.
 
  #3  
Old 12-20-14, 06:03 AM
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The metal rails you are referring to are actually part of the lath known as " expanded lath". The cement material, judging by the way it is decaying near the water or heat pipes , is probably gypsum plaster basecoat mixed with sand aggregate. It may, considering this is a garage, contain asbestos. A test is relatively cheap.
 
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