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WHAT IS THE WHITE POWDERY SUBSTANCE ON MY BASEMENT WALLS?

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This is known as efflorescence and is a sign of dampness in concrete walls. The moisture is causing a chemical breakdown of the bonding agent in the concrete and the free lime is leaching out of the wall. If this problem is ignored it will eventually start to weaken the concrete and compromise the structural integrity of the wall. The powdery substance can be washed or brushed off the wall and then the entire area can be sealed with either AQUA-STOP or AQUA-BLOCK BB. more
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