Water coming under garage wall.

Protractor

Hi. I've got a garage on the side of my house and it looks like the outside ground was higher than the inside so I dug back the outside to the foundation.

I can see both the inside and outside levels are the same height so when it rains lots of water runs under the wall into the garage.

I can only dig back about 1 foot from the garage as the neighbor's is next to it. I was thinking of applying a few coats of tanking slurry to the outside?

Or would raising the internal floor a few inches stop it? Or would it eventually make its way up through the floor or up the walls? I had a diagram drawn but it won't let me post a link is I'm new.

10-10-20

I think we're gonna need to see that diagram! A few posts in After Hours should have you sorted. 😁

Was the wall set down on a concrete plinth such as a path or existing structure, or was it built up on a channelled foundation? Any DPC that you know of in the wall or in the concrete floor?

What about drainage and gutters? All in place and functional?

C. Eastwood

https://www.boards.ie/discussion/2058225006/water-coming-under-garage-wall

Protractor

Can you post any photos of the floor wall and outside

GreeBo

Does the ground outside slope away from the wall/trench? Does the trench fill up with water?

Even with tanking/slurry the water is going to get under the wall unless you remove it, I reckon you need something like a French drain to remove the water, so it doesnt have the chance to soak into/under your wall.