Pasting aluminum foil on damp walls: What this simple trick can reveal

A simple aluminum foil trick could help homeowners get an early clue about where moisture in a wall is coming from. The low-cost method involves covering a damp or suspicious area with foil, sealing the edges and checking it after 48 hours.

While it cannot replace a professional inspection, the test may help distinguish between moisture coming from inside the wall and dampness caused by the surrounding environment.