How to Prevent Chalking of Basement Walls
Chalking of concrete, stone or brick walls in your basement is called efflorescence. Before you blame the contractor or the kids, know that this is a natural, no-fault occurrence where masonry is concerned. The salts and other water-soluble minerals that are naturally found in masonry are dissolved by the introduction of moisture; as the moisture evaporates, it acts as a catalyst for the minerals, carrying them to the surface of the masonry. Here the minerals are deposited, leaving a white crust on your walls. Does this Spark an idea?
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Things You'll Need
- Waterproof masonry sealer
- Downspout extensions
- Dehumidifier
- Mortar
- Trowel
- Caulking
- Stiff brush
Instructions
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Waterproof your walls. Applying a sealer manufactured specifically for preventing chalking on basement walls is a great preventative measure.
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Beef up your downspouts. Adding extensions to your downspouts and making any necessary gutter repairs is an effective way of preventing moisture from saturating your foundation and appearing on the inside in the form of chalk.
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Lower the humidity in your basement. High humidity can be just enough to cause chalking. If you live in a humid climate, try using a dehumidifier in your basement. Otherwise, insulate exposed pipes, seal off the dryer vent pipe and be sure no water is left standing in washing machines or utility sinks.
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Take care of breeches in the walls that could be allowing moisture in, such as cracks in the mortar or in the wall itself.
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Tips & Warnings
Using properly cured masonry that is manufactured specifically to prevent chalking can save aesthetic headaches down the road.
Efflorescence is harmless and will disappear with time.
Do not try to wash away the chalking, as adding more moisture only compounds the problem. Use dry brushing for removal if you feel it is necessary.
References
Resources
- Photo Credit concrete wall image by bayu harsa from Fotolia.com
