The main difference between these two processes is that exterior waterproofing stops any water from entering your basement from the outside, which allows the basement to feel dryer, as there isn’t any moisture within the foundation walls. The disadvantage with exterior waterproofing is that it costs a considerable amount more than the interior option. Also, the exterior option is not always possible due to tight spaces between different homes, and extremely wet soil conditions, which makes it almost impossible to excavate safely.
Interior waterproofing stops the water after it has entered into the basement and is controlled through a series of membranes and weeping tiles that redirect that water away from the finished interior.
The disadvantage of the interior waterproofing solution is that you are not addressing the problem at its source, but rather directing the water away after it has already entered the basement. The upside to interior waterproofing is that it costs a considerable amount less than the exterior option.
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