Water leaks from cold joint
I live in Omaha, Nebraska in 1970s house built with block foundation. I have unfortunately had some water damage in my basement. I started to pull some of the wet material out and noticed significant mold growth. I ended up hiring a remediation company to come out and they removed about 65 feet of drywall/shiplap plus some LVP flooring. They suggested water has to have been leaking in the corner where I noticed the damage for quite some time but it only appears to be entering in this one section.
It has not been wet since they removed everything but it also has not rained much at all yet. It rained last week and we ended up with a small amount of dampness. The picture here is after running the hose for about 5 minutes against the foundation wall and this what I ended up with after about two hours. It appears to be filling the blocks and leaking at the cold joint?
I’ve had four foundation companies come out. All four suggested interior drain tiles and a sump pump. Quotes ranged from $13,000 for a full interior system, down to $4,500 for about 30 feet of drain tile and a sump pit + pump. I attached one of the diagrams for the middle of the road system that would include a sump pit + 68 feet of drain tile. One of the companies told me if it was him he just wouldn’t finish this corner of the basement…? lol another said excavating is the proper way but it would run into the $20k range.
I had a stone mason come out today and suggest excavating the foundation in the exterior and doing a waterproof membrane. His quote came in the cheapest at about $3,250 to excavate, put up the rubber membrane, backfill, and tuck any mortar that needs addressed.
Seems like everyone has an opinion about why/why not to do something and I’m honestly just lost. Everyone except the stone mason seemed like they are just trying to sell me something. So basement people of Reddit, what would you do?