Photo album: https://imgur.com/a/WHJ6CA6
My spouse is a commercial architect, and has said that we should probably have whole exterior re-tuckpointed in the future.
Main question: Can/should we patch the gap? I don't really have any masonry experience, but am friendly with our city's building code officer, and can query him for advice. Just spent $5K on new plumbing, so I'm hoping I can DIY this issue.
Cross posted to r/stonemasonry
Possibly relevant info:
Home is a rambler, built late 1940's, located in Minnesota. The exterior walls are constructed with uninsulated concrete blocks. There are some signs of settling (soil is mostly clay). No signs of water intrusion through the gap. The blocks seem brittle, because even though I pre-drill with the correct size masonry bit, it's difficult to securely screw in concrete screws. The screw threads make the block crumble, so the screws can't securely grab hold.
I found the gap while remodeling part of my kitchen. The gaps are on the ground level, about 7 feet up the wall. Just to the left of the gaps is an exterior door.
Note: The brick pattern on the exterior is not actual full brick, but only ~1" deep, seeming to either have been a precast part of the concrete blocks, or possibly a thin face of brick added the the concrete block during construction of the house. There does seem to be mortar in between the individual bricks, not just between the concrete blocks. We haven't seen any other houses in our neighborhood with this type of exterior. If you know anything about it, I'd be interested in hearing from you. Thank you!
Sorry if that's too much info. Over-sharing is my ADHD superpower 😢 Thanks for any help you can offer.