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Can Brick Absorb Water and Cause Interior Damage?

Last updated October 26, 2026

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The short answer

How Water Gets Inside

Brick itself is not waterproof. It has tiny pores that soak up water like a sponge. Rain or storm surge can push moisture into the brick and the mortar joints between them. If the brick has cracks or the mortar is deteriorating, water enters even faster.

Once inside the wall, moisture can travel along the brick and into the wooden framing behind it. From there, it can soak into insulation, drywall, and electrical boxes. This hidden moisture is what often leads to interior damage you might not notice right away.

  • Check for efflorescence, a white powdery residue on brick, which signals moisture.
  • Look for cracked or crumbling mortar, a common entry point.
  • Inspect the interior walls for damp spots, peeling paint, or soft drywall.
  • Watch for a musty smell, which can indicate mold growth behind the wall.
  • Pay attention to stains on ceilings or walls near brick exterior walls.

Signs of Interior Damage

The first sign of water damage from brick might be a small brown stain on a ceiling or a bubbling patch of paint. Over time, the drywall may become soft or sag, and the wood studs behind it can start to rot. Mold can also begin to grow within 24 to 48 hours in damp conditions.

If you notice any of these signs, act quickly. The longer moisture sits, the more extensive the damage becomes. You may need to cut away wet drywall and insulation to let the wall dry out, which is a job for the pros if the damage is widespread.

  • Soft or spongy drywall when you press on it.
  • Bubbling or peeling paint on interior walls.
  • Visible mold spots on walls, baseboards, or around windows.
  • A persistent musty odor in the room.
  • Dark water stains that grow over time.

Why Brick Soaks Up Water

Brick is made from clay that is fired in a kiln, which leaves it porous. This is why brick can absorb water, sometimes up to 10 to 15 percent of its weight when saturated. The mortar between bricks is also porous and can wick water upward from the ground or sideways from rain.

In coastal areas with heavy rain and storm surges, water intrusion through brick is a real concern. If you live near the coast, it is wise to check your brick walls for moisture after major storms. Even without a storm, regular rain can cause problems over time.

Preventing Water Intrusion

Prevention is the right way to avoid interior damage. Keep gutters and downspouts clear so water is channeled away from the brick. Ensure the ground slopes away from the foundation so water does not pool against the wall. Seal any cracks in the brick or mortar with a suitable masonry caulk or sealant.

If the brick is in poor shape, you might need to have it repointed, which means replacing the old mortar. This is a job for a mason or a water damage pro, not a do-it-yourself task. Regular maintenance can help keep moisture out and extend the life of your brick walls.

What to Do After Water Damage

If you suspect brick has let water inside, start by drying the area as much as possible. Open windows, use fans, and remove any wet items. Do not turn on electrical appliances near wet areas. If you feel unwell from mold exposure, see a doctor.

For serious water damage, you need a thorough inspection and cleanup. A water damage inspection can identify the source and extent of moisture. Then, cleanup and repair services can dry the structure, remove damaged materials, and prevent mold. The pros can also help with documentation for your insurance claim. Policies vary, and your insurer decides what is covered.

  • Dry the area with fans and dehumidifiers.
  • Remove wet carpet, furniture, and belongings.
  • Do not use electrical outlets or switches in wet areas.
  • Call a water damage pro for an inspection if the damage is extensive.

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Frequently asked questions

How long does it take for brick to dry out after rain?

Brick can take several days to weeks to fully dry, depending on the weather and how much water was absorbed. In humid conditions, drying is slower. If the brick stays wet for a long time, it can cause ongoing interior moisture problems.

Can brick be waterproofed to prevent water absorption?

Yes, a breathable masonry water repellent can be applied to the exterior of brick. This helps reduce water absorption while still allowing moisture to escape. It is important to use a product designed for brick, as non-breathable sealants can trap water and cause damage.

Is water damage from brick covered by homeowners insurance?

Coverage depends on the cause. Sudden and accidental water damage, like from a burst pipe, is often covered. Long-term leaks or gradual damage from lack of maintenance usually are not. Check your policy and talk with your insurer to understand what is included.

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