How do I self-repair a section of crumbling basement wall, or should I hire a professional?
How I discovered it:
I removed some exposed blue foam insulation from my basement walls to comply with my home insurer's request (part of the solution to the question I posted here). Unfortunately, I discovered a crumbling foundation wall hidden behind it in one corner.
About the house:
The house was built in 1928. The foundation wall is a mix of stones and mortar - and even some seashells (I’m on the east coast of Canada, and apparently this is very common). The basement is dry most of the time, but with very heavy rain/snow thaw in the spring, I get water seeping from beneath the concrete floor/walls (this corner is particularly bad and now I know why!). This does cause some puddles, but I have a sump pump that helps move water away. The point here is that the basement is not waterproof - which I accept for the time being.
- Should I, and how do I self-repair this section of crumbling basement wall?
- 1b. What kind of mortar should I use? (my reading has suggested I should use a high lime mix - which is breathable and won’t trap moisture)
- Is this is a more serious problem than I'm assuming - should I hire a pro to assess it?
My expectations are not to create a perfectly watertight seal (that would be unrealistic without work being done on the exterior), I am simply looking to prevent further damage, without doing even more damage with the solution I choose. There are no plans to finish this basement.
I was thinking about getting some stones and mortar to fill the voids.
To further secure that section of the wall I was thinking about getting some wire-mesh, securing it over the broken area, and then parging over the top for extra strength - is this a terrible idea?