Crack in plaster-on-concrete wall


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Old 12-16-12, 11:01 AM
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Crack in plaster-on-concrete wall

Hello,

We bought a 1956 brick 2-story townhouse a few months ago. After noticing areas where the paint was starting to pull from the living room wall and some bad patch jobs, we decided to scrape the paint and other imperfections off the wall. As we were scraping an area under the window where a bad patch had been performed and was re-cracking, we realized that the crack went through the plaster and into the concrete. What is the best way to repair this? Whatever was used before was brittle and crumbled right out of the crack.

Thanks!
 
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Old 12-16-12, 04:19 PM
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What do you mean by the crack goes into the concrete? are the exterior walls concrete? or are you referring to the base coat of plaster?

Assuming there aren't any structural issues, I'd clean out any loose material, prime if dusty and then fill in most of it with a setting compound like durabond. I'd then lay some drywall tape in wet mud [either durabond or regular joint compound] and finish it off with another coat or two of mud. Let the mud dry between coats.

A little hard to tell from the pic but it looks like the wall has a texture that you would need to duplicate in order for the repair to disappear. Most textures can be made by thinning the mud down to close to paint consistency and applying it in various manners.... a sponge might work for yours.
 
 

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