Installing Basement Waterproofing from the ‘Negative’ Side

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Of course the best way to waterproof any below-grade assembly is from the exterior — but what if you have to work from the interior?

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Negative-side waterproofing (NSW) is a tough topic that I have frankly been dancing around for quite some time. Manufacturer claims and homeowner anecdotes of successful interior waterproof solutions for basement walls and slabs did not completely add up. But I did not think that I understood the topic or the physics well enough to challenge the claims or explain my skepticism.

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