A. Before finishing the interior of a basement, first verify that the basement doesn't leak, that there's good perimeter foundation drainage, and that the grade is correctly pitched to control surface runoff.

Applying a layer of dampproofing on the inside of the foundation wall makes sense. Drylok (www.ugl.com) is an oil-based "waterproofer" with a perm rating around 25 that is designed for wet walls. However, the product smells bad and needs days of ventilation. UGL also makes a latex masonry "waterproofer" with a perm rating...

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