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Fixing drywall that's over lath and plaster

333 Views 12 Replies 5 Participants Last post by  finisher65
Drywall was ruined underneath the switchbox so I repaired it using another piece of drywall. Problem is it's over lath and plaster so it's hard to get the depth right. Anyone have any suggestions for fixing something like this?

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Build it up with mud
You can't build up that much with mud it's not cement it's just gonna crack and shrink and be all ****y.
Or, if you'd rather, remove the incorrect sheetrock and shim the substrate and put the sheetrock back on.

And then, since there'll probably be a depth issue, you can build it up with mud as first recommended.

Mud can easily be layered. A simple search will reveal that mud can be applied up to 4" thick. The process is pretty simple. Layer it, use mesh or other tape, let it dry and add another layer.

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Use hot mud first then finish with premix mud
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Use hot mud first then finish with premix mud
That'll get it done a lot faster, also!
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Use hot mud first then finish with premix mud
Hot mud?
If done correctly it will not crack think about plaster Cornish it is sometimes up to 6 to 8 " in thickness with no cracks use a setting compound it will be fine.
Hot mud is what we call the stuff in a bag you mix your self such as easy sand from HD
Hot mud is what we call the stuff in a bag you mix your self such as easy sand from HD
Okay why is it called that? And so put a drywall patch in the wall, cover it with a base of hot mud and then put normal drywall mud overtop that?
Okay why is it called that? And so put a drywall patch in the wall, cover it with a base of hot mud and then put normal drywall mud overtop that?
Yup - or multiple layers of regular if that's what you already have. You will have to finish with feathered layers of normal mud as hot mud can tend to dry granular and rough, especially for a DIYer.

It's called hot mud since it sets up fast based on a chemical reaction that causes it to warm up. Plus, you have to use it within the setting time for that bag (usually in big numbers on the bag) so once you add water and mix it's time to use it so you better be "hot to trot" and get it done before it starts to set up.
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You can't build up that much with mud it's not cement it's just gonna crack and shrink and be all ****y.
What I see in the picture can easily be fixed with mud.
If you mean patching straight from the lathe then Clarence is the man to listen too.
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