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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous]Of course the best way to waterproof any below-grade assembly is from the exterior or the positive side — but what if you have to work from the interior or the negative side?

https://www.waterproofmag.com/2018/04/dos-and-donts-of-basement-drainage/

If you do interior it has to be done perfectly and you have to keep it clean and operating perfectly. But I can’t get over the fact that the water is still freely getting into your structure it’s just being whisked away after it’s gone through your walls or foundation. In fact you’re drawing it in and into the drain actively through the action of the sump pump.

You should consider increased moisture and humidity that is likely from the interior solution. It’s not clear to me how installing weep holes into your wall which then drain into the interior drain which then drains into a sump pump, even if perfect, prevents mold? The interior solution doesn’t stop the water ok the outside of your walls; it drains it into an interior channel. So 🤔

It strikes me as an idea we might come to regret; like the spray foam or EIFS

[/quote]
Fwiw, other posters, I have interior drains and what this guy is saying makes no sense. They’re under the floor. They work the same way as external drains as far as the walls. Exterior drains don’t “stop water” in a different way than interior drains. They’re not inside your house, they’re just inside the walls, horizontally. [/quote]

What?! You have water coming in from the sides or under, right? So now I’m not going to do anything at all to fix that on the exterior. The water is still coming.

Now I do the interior drain. That involves drilling weep holes in the bottom of the walls which drain behind the interior perimeter assembly and into your interior drain. The water is still coming through the side walls and under but is getting suctioned away through the interior drain and into the sump pump. My space is dry. If I’m smart I’m using a dehumidifier because all that water (now enhanced flow due to pressure differential with the sump pump) is still in my walls or under my slab or in my crawlspace.

Still with me? How is that a better idea for the homeowner than exterior drain solution other than being a bit cheaper? It is better for the company: easier, quicker, less work. [/quote]

Now there’s a drain under my floor slab. Before there was wet dirt. I don’t see the difference. [/quote]

You don’t “see” the difference. But if you had water in your walls before, you still have the water in your walls. So maybe check for mold spores in your air? Or in your wall? Just a thought [/quote]

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