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Old 01-04-2018, 10:56 AM   #16
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Re: Repairing peeling skim coat of old plaster?


Rocklath is a plaster board used mostly in the 1930's to the 1950's as a base for a gypsum brown coat plaster application than a white coat finish was applied. The selling point at the time was the board and base coat could be applied on the same day saving two days as related to conventional plaster system. The Rocklath was in bundles 16 inches wide & 48 inches long 6 sheets per bundle. It came in thickness of 3/8 & 1/2 inch. Also came Perforated 3/4 " round holes , Regular & Aluminum foil laminated.
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Old 01-04-2018, 12:56 PM   #17
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Re: Repairing peeling skim coat of old plaster?


Didn't they do away with the holes a few yrs after the drywall lath came out ???
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Old 01-04-2018, 01:04 PM   #18
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Re: Repairing peeling skim coat of old plaster?


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Originally Posted by mark sr View Post
Didn't they do away with the holes a few yrs after the drywall lath came out ???
The perforated board phased out due to the regular board working so well.
You could order the perforated board if it was required.
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Old 01-07-2018, 06:18 PM   #19
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Re: Repairing peeling skim coat of old plaster?


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Originally Posted by dirtynails View Post
I'll bite: what is a rock lath? I can't tell you how many times in my self taught career I didn't know the technical term for stuff, particularly before the internet.
Haha, I didn't know either. I learned the term from ClarenceBauer here. I didn't know what it was called either, but I have owned two properties built in the 50s with this type of walls and ceilings on them. I have been referring to it previously as a "three ply wall - a layer of gypsum board, then a layer of stucco like cement material, then a thin layer of white egg shell plaster, with a total thickness of over 1 inch", and guys were like "WHAT?"

So after I learned it's called a "Rock Lath" I started to call it that, and guys are still like "WHAT?"

It's a real pain to cut holes, or to demo these walls. Lots of dust, and worst of all, is at the corners to another wall or ceiling, they have those wire mesh connections that you have to break out an angle grinder or slowly use a tinsnip to cut off.
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