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Why Are Older Brick Buildings at Risk for Foundation Water Damage?

Last updated October 31, 2026

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The short answer

Aging Materials

Older brick buildings were built with materials that behave differently than modern ones. Lime mortar, common in older construction, is softer and more porous than Portland cement. It absorbs water readily and can wash out over decades, leaving gaps between bricks.

The bricks themselves may be softer and more absorbent than newer fired clay units. When water gets into these materials, it can travel deep into the wall and reach the foundation. Repeated freezing and thawing in a humid continental climate can crack bricks and mortar, opening more paths for water.

Lack of Modern Drainage

Many older buildings were built before modern foundation drainage systems existed. There may be no perimeter drain tile, no sump pump, and no waterproof coating on the outside of the foundation walls. Without these, groundwater presses directly against the foundation.

Even if a drainage system was added later, it might be poorly connected or clogged with soil. Downspouts may empty too close to the building, dumping roof water right at the base. Over time, that water saturates the soil and finds any crack in the foundation.

  • No exterior waterproof membrane
  • Missing or broken drain tile
  • Downspouts discharging near the wall
  • Gutters that overflow or leak
  • Grading that slopes toward the building
  • Old window wells that trap water

Settling and Cracks

All buildings settle a little, but older ones have had more time to shift. Clay soils expand when wet and shrink when dry, which can move a foundation unevenly. This movement opens cracks in the brick and mortar, especially at corners and around windows.

Cracks in the foundation let water in even if the soil drainage is good. Once water enters, it can erode the soil under the footing, causing more settling. This cycle can worsen over time, making the foundation less stable and more prone to water entry.

Signs of Foundation Water Damage

Look for efflorescence, a white chalky powder on interior or exterior brick, which forms when water evaporates and leaves salts behind. Damp spots, mold, or a musty smell in a basement or crawlspace also point to moisture. Cracks in interior walls or sticking doors can mean the foundation is shifting.

Check the mortar between bricks. If it crumbles easily or has deep gaps, water can get in. In winter, frost can widen those gaps. If you notice any of these signs, it is worth having a water damage inspection to see how much moisture is getting in.

What You Can Do

Start by improving drainage around the building. Clean gutters and extend downspouts so water discharges several feet away. Make sure the ground slopes away from the walls. If you have a crawlspace, check for standing water or damp soil.

For the foundation itself, you might consider foundation waterproofing, which usually involves excavating and applying a membrane or coating. Inside, a dehumidifier can help, but it treats the symptom, not the source. A water damage inspection can help you decide which repairs are worth doing.

Acting early can prevent small leaks from becoming big repairs. Keep gutters clear before heavy rains, and check downspouts for blockages.

  • Clean gutters and downspouts twice a year
  • Extend downspouts at least 5 feet from the wall
  • Regrade soil so it slopes away
  • Seal cracks in brick and mortar promptly
  • Install a dehumidifier in damp basements
  • Have a water damage inspection before buying or renovating

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Frequently asked questions

Can I fix foundation water damage myself?

Small cracks can be sealed with masonry caulk, but larger issues need a pro. Excavating and waterproofing a foundation is heavy work. If you see bowing walls or major cracks, get a professional opinion before attempting repairs.

How do I know if my foundation has water damage?

Look for damp spots, efflorescence, mold, or musty odors in basements or crawlspaces. Cracks in interior walls or floors, and doors that stick, can indicate shifting. A water damage inspection can measure moisture levels and find hidden problems.

Does foundation waterproofing stop all water problems?

It can help, but it works right with good drainage. Waterproofing only protects the wall surface; if water pools at the base, it can still seep through. You also need proper grading, gutters, and downspouts to keep water away.

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