Foundation drain

I have been getting water in the basement at the bottom of the foundation where the EL attaches to the main house. The main house foundation is 200 year old dry stone (no mortar) approx. seven feet high, while the EL is thirty year old concrete and crawl space only, so it should be on a footing down four feet. The water comes off the valley and is directed four feet away from the intersection of main house and EL. When I redirected the water it didn't come into the basement the next time it rained but the next rain after that it did. I believe that the water is running along beside the footing due to lack of compaction and poor material when back-filled. My current plan is to excavate to just below the footing and install a french drain to low ground which is nearby, and to install compact-able crushed gravel between the drain and the stone foundation which will probably end up being about three feet apart. The idea of the compacted gravel is for a water barrier between the drain and the foundation. I want to do the best that I can do within reason while I am at it so I have been considering other barriers such as rubber roof against the stone foundation, or a concrete wall poured against it. Any different ideas?

EPDM roofing (90mill) laid so it is under the drain tile, and up the wall would be about as secure as possible. Using gravel for a foot on the tile would allow
water entry into the tile. Then backfill. Jim

Jim has it right. I might add, if you can get it dry there is a product called rubber wall that you might pour in the crack between the footer and foundation.
Ellis

(quoted from post at 14:35:33 12/30/19) Jim has it right. I might add, if you can get it dry there is a product called rubber wall that you might pour in the crack between the footer and foundation.
Ellis

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Ellis, I don't have a crack, I have gaps between rocks, LOL. I will look into that. It may be good between where the EPDM meets the concrete foundation.

(quoted from post at 14:02:29 12/30/19) EPDM roofing (90mill) laid so it is under the drain tile, and up the wall would be about as secure as possible. Using gravel for a foot on the tile would allow
water entry into the tile. Then backfill. Jim

Click to expand...

Jim, I was planning on 3/4 clean stone over the tile to allow water entry into the tile.

You normally need to completely wrap your
rock and pipe in a geo fabric to stop the
infiltration of your dirt into the rock.
Over time the dirt will fill the voids in
your rock creating a drain that doesn't
work.

(quoted from post at 16:16:26 12/30/19) You normally need to completely wrap your
rock and pipe in a geo fabric to stop the
infiltration of your dirt into the rock.
Over time the dirt will fill the voids in
your rock creating a drain that doesn't
work.

Click to expand...

Thanks Craigco, that is part of the french drain install. My concern is redirecting water away from the very porous stone foundation

Do as craigco said and here is a foudation seal that works well if you can get the concrete clean.
waterproof membrane

Do you have gutters on your house? Getting the runoff from
the roof away from the wall may help too. I need to put the
gutters back on the east side of my house. The old ones were
removed so I could install aluminum fascia and left off till I got
a metal roof on which made me concerned about snow sliding
and pulling the gutters off. I put them back on the west side
and after 2 winters so far so good .