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Why Is Water Coming in Through My Brick Walls?

Last updated October 31, 2026

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The short answer

Common Entry Points

Brick walls are not waterproof. They absorb moisture like a sponge, and that water can travel through to the interior. The most frequent culprits are cracked or crumbling mortar joints, which let rain push in during storms. Even hairline cracks can widen over time, especially after freeze-thaw cycles.

Another common spot is around window and door frames. The sealant or caulk that bridges the gap between brick and frame can dry out, shrink, or pull away. Once that seal fails, water follows the gap straight into your wall cavity. Flashing, the metal or plastic piece that directs water away, can also be missing or damaged, especially where a roof meets a chimney or wall.

  • Cracked or missing mortar joints
  • Failed caulk around windows and doors
  • Damaged or missing flashing at roof intersections
  • Spalled or chipped bricks that absorb water
  • Poor grading that lets water pool against the wall
  • Weep holes blocked or absent at the base of the wall

Signs of Water Intrusion

You may notice damp spots on interior walls, peeling paint, or a musty smell. Efflorescence, a white chalky powder, appears on brick when water evaporates and leaves mineral salts behind. That is a clear clue that moisture is moving through the wall.

Inside, look for staining or bubbling under windows or along baseboards. If the wall feels wet or shows dark patches, water is already making its way through. Catching these signs early helps limit damage to framing, insulation, and drywall.

Why Brick Soaks Up Water

Brick is a porous material, meaning it has tiny holes that soak up water like a sponge. In a hot semi-arid climate, the brick can dry out between rains, but during wet periods, it absorbs moisture readily. If the wall lacks a proper water barrier behind it, that moisture reaches the interior.

The mortar between bricks is often more porous than the brick itself. When mortar erodes, it leaves gaps that channel water deeper. Over time, this can lead to structural issues, as repeated wetting and drying weakens the wall.

What to Do Right Now

If water is actively coming through, move belongings away from the affected wall and place towels or a bucket to catch drips. Turn off any electrical power to outlets or switches on that wall if you suspect water contact. See a doctor if you feel unwell from any moldy smell or damp conditions.

Then, contact local water damage pros for an inspection. They can assess the extent of the moisture and help you understand whether it is a simple sealant fix or a larger drainage issue. Acting quickly helps prevent mold growth and further damage to your home's structure.

Long-Term Repairs and Prevention

Repairing brick walls usually involves repointing, which means removing damaged mortar and replacing it with fresh mortar. Cracks in bricks themselves may need patching or replacement. Around windows and doors, new caulk or flashing may be installed to redirect water away from vulnerable seams.

Prevention also involves improving drainage around the foundation. Ensure gutters and downspouts direct water away from the wall, and grade soil so it slopes away. After heavy winter rains, inspect the brick for new cracks or damp spots, as wet seasons can reveal weak points.

  • Repoint mortar joints every few decades as needed
  • Reapply exterior-grade caulk around openings annually
  • Install or repair flashing at roof and wall intersections
  • Clear weep holes at the base of the wall
  • Extend downspouts at least a few feet from the wall
  • Seal brick with a breathable water repellent if advised

Water damage does not wait

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Frequently asked questions

Can I seal my brick walls myself?

You can apply a breathable masonry sealer, but it is not a cure-all. The real fix is addressing cracks, mortar, and flashing. If you are unsure, have a pro inspect first. Sealing over wet or damaged brick can trap moisture and cause more harm.

Will my insurance cover water damage from brick walls?

Policies vary, and your insurer decides what is covered. Water from a sudden storm or burst pipe may be covered, while gradual seepage often is not. Check your policy and document the damage with photos. Your insurer will guide you on what applies.

How do I know if the water is coming from rain or a leak?

Rain-driven water often appears during or right after storms, while a leak may be constant. Check for dampness during dry weather too. If it only happens when it rains, the issue is likely exterior. A pro can use moisture meters to trace the source.

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