How to stop water ingress under house through external brick wall?

[approachmhn]

 The external wall is single brick, I am getting water coming through the brickwork to crawl space under house when it rains .

I can get to both positive and negative sides of the water transfer.

Is there a suitable product to seal the wall on the outside or inside.

the upper part of external wall is rendered. So I think water ingress is through bottom where wall is not rendered and is covered by soil.

appreciate your suggestions

thanks.

 

 

[approachmhn]

Thanks @MitchellMc.

will check with drainage plumber as suggested. And then will do the drain coil and gravel myself.

will update here. 

[approachmhn]

Hi,

I did seal the wall with plastic throughout as in pic attached. And when it rained I noticed there is no water ingress or pooling on the other side of the wall.

Does that mean can I put concrete slab next to wall so that water flows away?

So I can avoid Agri drain and  cutting through driveway.

Appreciate your response. Thanks 

 

 

[EricL]

Hello @approachmhn 

I understand that it feels like the plastic has deterred the flow of water towards your wall, but I believe that this is a stop gap measure. Eventually as the water flows to your garden and travels into the soil its natural inclination is to flow towards the lowest point and in this case it's your brick wall. It will travel beneath the slab and then meet up with your brick wall and you'll have the same issue again. I propose acting on the suggestions made earlier and that is to seal the wall and install the agi-pipe to provide maximum diversion to any incoming water that's headed towards your brick wall.   

If you have any other questions we can help with, please let us know.

Eric

[Dave-1]

Afternoon @approachmhn 

I agree 100% with @EricL on this, subsurface water will always keep on traveling, putting something in place to handle it even tho it cant be seen is the wisest option. If you spend a bunch of $$$$ on concreting without prepping your area it may come back to haunt you.

Dave

[approachmhn]

Thank you @EricL and @Dave-1 .

i will start with sealing the wall and the agi pipe as suggested. Will update as I progress 

[approachmhn]

@MitchellMc @Got a question regarding painting.

Do I need to paint on both sides of the wall to waterproof?

or just outside wall after digging a trench is enough?

TIA

[MitchellMc · Accepted solution]

The most important part is on the outside of the wall, @approachmhn. However, it wouldn't hurt if you also painted the inside.

Mitchell

[approachmhn]

Hi @MitchellMc ,

i dug a trench along the wall yesterday I.e around 10 cm below the bricks where concrete slab is seen.

it rained overnight  and I could see no water ingress under the house.

Standing water in the trench remained there for the whole day and there was no water ingress under house.

Looks like the ingress was through bricks. I saw small roots in the brick work at few places which I removed  as much as possible.

Should I render the bricks  and then  waterproof or simply waterproof so that will take care water ingress issue?

Also, for Ag pipe along the wall, should I cover the top with dirt or just gravel ? 

I am planning to lay pavers on top along the wall. Is that ok?

My plan is if I lay the pavers on top which slope towards driveway, and there will be less water going towards ag pipe I.e under pavers. So, instead of cutting concrete to connect ag pipe to storm water pipe, I can just dig trench around 2 -3 metres away from wall and leave it to soak to the ground. Will that work?

TIA.