What is Efflorescence and Why Does is Matter?

Efflorescence

Have you noticed a white, chalky powder on your basement walls, brick, or concrete? That substance is called efflorescence, and while it may look alarming, it’s actually a common issue in homes. Efflorescence occurs when water travels through masonry, dissolves salts inside the material, and then leaves those salts behind on the surface as the water evaporates.

While efflorescence on basement walls or foundations isn’t harmful on its own, it may indicate that moisture is present. Common sources include poor drainage, clogged gutters, or issues with your irrigation system. Addressing these issues early can help prevent potential long-term concerns and keep your home in good condition.

If you see efflorescence, it’s worth taking a closer look. Identifying and fixing the source of the moisture—whether that’s adjusting grading, repairing gutters, or sealing the masonry—will help protect your home from long-term damage.

Homeowner Tips to Prevent Efflorescence

• Check grading and drainage: Make sure rain and water from your irrigation system flows away from your foundation.

• Maintain gutters and downspouts: Clean them regularly and extend downspouts at least 5–10 feet away from the house.

• Seal masonry walls: Use a breathable, water-repellent sealant to block water while letting vapor escape.

• Control indoor humidity: Install a dehumidifier in damp basements or crawl spaces.