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If you don't know where that nasty damp smell in your basement is coming from, don't despair. There is a simple test that can tell you whether the water is seeping in from the outside or condensing inside. And, you didn't have to have written the guide to basement waterproofing to perform it. Tape a twelve-inch square of aluminum foil to a wall that tends to get damp on you. Be sure to make all four sides as airtight as possible. Wait a day or two. If the side of the foil against the wall is wet, you got seepage; if the outside is wet, you got condensation.