Water leaking through basement wall

[Methane]

I have a house from the late nineteenth century with a crawl space foundation made of natural stone. The foundation is low, with about two decimeters between the subfloor and the ground. However, a small part of the foundation, about two by three meters, is almost standing height and has a concrete floor. The walls are made of masonry natural stone. The house doesn't have any installed drainage and won't be getting any. They didn't build like that back then. Experts on old houses suggest that there can be settling if I drain more than what is natural today. The ground drains well by itself, lots of sand.
But, during heavy rain, water can leak in near the floor through a crack in the wall. All the other joints are apparently tight. Otherwise, it’s mostly bone dry. The crack/hole is a couple of cm wide/high. I haven't checked the depth.
A little moisture that comes in doesn’t matter, the crawl space dryer takes care of that.

My question is, can I try to seal it from the inside? What material should I use for that?

 

[jojo123]

How are you doing with the downpipes, directly onto the ground, usually a cause of water penetration, divert that water in pipes, lay them on the ground to begin with before you consider burying them.

 

[RapidSledge]

I have a house from the late nineteenth century that has a natural stone foundation. The foundation is low, with about two decimeters between the floor’s blind bottom and the ground. A small part of the foundation, about two by three meters, has almost standing height and a cast floor. The walls are made of masonry natural stone. The house has no installed drainage and will not get any. They didn’t build like that at the time. Experts on old houses believe there could be subsidence if I drain more than what is natural today. The ground drains well on its own, lots of sand. However, during heavy rains, water can leak in near the floor through a gap in the wall. All other joints are apparently tight. Otherwise, it is usually bone dry. The gap/hole is a couple of cm wide/high. I haven’t checked the depth. A little moisture coming in doesn’t matter; the crawl space dryer takes care of that.

My question is, can I try to seal from the inside? What material should I use?

Weber water stop + cement mortar. Do not mix more than 1 dl at a time as it sets quickly.

 

[jojo123]

can I try to seal from the inside

If you try to seal on the inside, the water will just find another path through the wall; all sealing, to be effective, should be done on the outside.

 

[RapidSledge]

If you try to seal on the inside, the water will just find another way through the wall; all sealing to be effective should be done on the outside

Crawl space made of natural stone, what should your sealing on the outside look like?

 

[jojo123]

how should your exterior sealing look like?

Not in any way a solution for sealing a torpargrund, it was a stone paved with cement floor in part, sealing should be on the outside of a foundation wall if it is fully walled or built in another way.

 

[RapidSledge]

"The gap/hole is a couple of cm wide/high."
It's perfectly fine to stick a water glass into such a hole.
Otherwise, he should probably let the foundation be as it is; it has held firm for over 100 years."

 

[Methane]

I can only access the outside on one side, the other three are under the house. I have been strongly advised against digging on the outside to prevent the foundation from losing support. I would need to dig almost two meters down and two meters along the house foundation, as well as wide enough to reach the bottom. It's a non-project, dangerous for the house. One recommendation I received is to dig a stone trench to handle excess water, but other experts advise against it because it would disturb groundwater conditions. For this reason, I wanted to try sealing from the inside. It should not have any negative impact on the stability of the wall.