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Cracked plaster - adding insulation while I'm at it

Cracked plaster - adding insulation while I'm at it


Old 12-06-11, 10:04 AM
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Join Date: Dec 2011
Location: United States
Posts: 1
Cracked plaster - adding insulation while I'm at it

So I'll preface this by saying that I'm a newbie as this is my first home. However, I'm fairly handy and see this as a fix well within my capabilities.

1932 house in Wisconsin, the front entryway which is built out from the foundation has a section of plaster that has separated from the lathe near the floor. Last winter (our first winter) I saw frost on the inside of the wall near this defect as there is another door separating the living space from so it stays pretty cold.
So moisture is definitely getting in, or the warm air is condensing near this cold spot. This entryway is built on 3 feet or so of block and has about a 4'x 6' footprint. There is no insulation in the walls of this house - that is a project which will be done later.

So my question is how would you approach this while adding insulation at the same time? Take out the whole wall and insulate and then put in a vapor barrier, or maybe spray foam it and then put up a piece of drywall.

Or just knock out the plaster, leaving most of the lath in place and blow insulation, and re do the plaster?

Is there a downside to having a drywall - plaster junction? Should I remove lathes and screw drywall to studs or screw through lathe's.

Any info would be great.

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Old 12-06-11, 02:12 PM
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Join Date: Jul 2008
Location: NY
Posts: 10,986
You have to look outside first, for cracks or spaces, to see why the moisture is entering. After that's sealed, do the blow-in insulation. There is no reason to remove the entire wall. A drywall-plaster junction is fine.

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