How to stop water seeping through brick wall?

[caxelby]

Hello, I am looking for advice and product recommendations for how to stop water seeping through my garage brick wall. The exterior wall is single skin brick and after prolonged rain the bricks ‘weep’ with enough water to cause minor pooling on the concrete. I would love to stop this from occurring and also be able to paint the brick on the inside. Unfortunately I do not have access to the outside of the brick wall due to neighbours. Is it possible to solve the issue by applying a product on the inside brick surface in the garage?

[MitchellMc]

Hi @caxelby,

You could apply Crommelin 2L Dampstop to the inside of the wall as it's one of the only products that can be applied on the inside; most waterproofers need to be applied to the outside of the wall. Once this product has cured, you can paint over it with water-based paint.

Applying a waterproof coating to the inside of the wall is not a great solution to the issue. I understand access might not be possible to the outside of the wall, but water shouldn't be able to enter a brick wall. Typically, a damp coarse line prevents water from entering at the base and travelling up the wall. By applying the waterproofer to the inside of the wall, you are trapping moisture within it, and if the moisture travels up the wall to the top, you could see damage to the roof structure.

Can you physically not access between the two buildings, or is it that your wall is right on the boundary? It's obviously best to ask the neighbours for permission first, but I'd imagine that access to the other property to perform maintenance work on your wall would be permissible by the council. 

When using the Dampstop, ensure good ventilation, avoid breathing vapours and avoid skin and eye contact. Remember your PPE, including gloves and eye protection.

Please let me know if you have any questions.

Mitchell

[Greg_W]

I need to lay a single skin row of bricks up against sandstone that appears damp. The bricks will be rendered but I want to ensure the moisture from the sandstone doesn't end up through the bricks / render over time. Will this product Crommelin 2L Dampstop work if I apply it over the sandstone prior to laying the brick? We are probably looking at an area of a couple of square metres. I was thinking to lay the brick and fill in the small gap with cement. There wont be a lot of room to apply the Crommelin 2L Dampstop to the brick once laid so was hoping apply it to the sandstone before bricking and filling would do the job. Can you assist?The landscaper had arranged to have the brick wall above the sandstone rendered but didn't know the sandstone would remain exposed. A single skin of brick will cover the sandstone and blend in with the other block work but the sandstone is always wet and I don't want this coming through the brick / render over time