How do I repair falling sheets of masonry on cellar walls?
In this 1909 house with a Michigan basement, block walls were added in the 40's and the "knee walls" with dirt behind them were retained, but have a half to three-quarter masonry coating covering the dirt is failing. The big box store people are too young to have a clue as to what product or mix to use. I am thinking an old-school mason knows this situation, so seeking what KIND of bagged product or sand PLUS another, to mix and apply to falling sheets of old masonry. (The knee walls are 36" high, with a "24 inch deep "shelf" and then block wall to the rim joist.) Hope thie pix helps. Thanks a trillion!
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I believe you are talking about a stem wall used to join the foundation to the vertical walls. The damage here looks like it might be a moisture issue. What is the underlying material? Is it concrete?
Any mortar mix for concrete walls will work. No special mix. BUT you have a moisture problem that needs to be addressed first.
Here's an old school mason tackling old foundation problems (there are 9 parts) https://www.youtube.com/watch?v=nGH7eszfMvs
Don't need the mesh. Once the moisture problem is solved use hydraulic cement to fill any voids. Then a skim coat of a latex modified cement mix. It has bonding agents in it. Can be applied from 1/8" to 1/2" thick layers. Then you can paint with Drylock waterproofing paint. Absorbs deep into concrete or block.
it needs to be done from the beginning with mesh wire
Your walls have blown. you wil need to either patch yourself, or call in a Plasterer to do the job for you.
You can also visit https://www.friendlyroofingandmasonry.ca/ and get us to take a look.