The short answer
How Water Affects Brick
Brick is naturally porous, meaning it can soak up water like a sponge. When moisture gets into the brick, it can freeze and expand during cold spells, causing the surface to flake or pop off. This process is called spalling, and it weakens the wall's outer layer.
Even without freezing, constant dampness can lead to efflorescence, a white chalky residue left behind when water evaporates. That residue is a sign that moisture is moving through the brick. Over time, the brick itself can lose strength and become crumbly.
- Spalling creates pits and flakes on the brick face
- Efflorescence appears as a white powdery film
- Damp brick can grow mold on the surface
- Cracks can widen as water seeps deeper
- Mortar joints may erode faster than the brick
Why Mortar Fails First
Mortar is the softer material between bricks, and it is designed to be more porous than the brick itself. That means it absorbs water readily and deteriorates quicker. Rain, sprinklers, or plumbing leaks can wash away the mortar, leaving gaps that let water reach the wall's core.
Once mortar crumbles, the bricks lose their grip and can shift. This is a structural problem, not just a cosmetic one. If you see missing mortar or bricks that wiggle, the wall's stability is already compromised and needs attention.
What to Do After Water Exposure
If your brick or mortar wall has been soaked, start by addressing the water source. That might mean fixing a leaky pipe, clearing a clogged gutter, or regrading soil that slopes toward the wall. Stop the water flow first, and then deal with the damp wall.
Dry the area as much as possible using fans and dehumidifiers. Remove any wet materials like insulation or drywall that touch the brick, because they can hold moisture and promote mold. For significant water intrusion, a professional assessment can determine the extent of the damage.
When to Call the Pros
You can handle small, surface-level issues like cleaning off efflorescence, but deeper damage requires expert help. If the mortar is crumbling, bricks are cracked, or the wall feels unstable, do not attempt DIY repairs. Structural problems can worsen quickly.
Local water damage pros can assess the situation and recommend the right repairs. They have the tools to check for hidden moisture and can help you document the damage for your insurance claim, if you have one. Policies vary, and your insurer decides what is covered.
Keep an eye on wet winter months when brick walls are most at risk. Acting early can save you from more extensive repairs later.
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Call Now (360) 685-7801Frequently asked questions
Can brick walls be repaired after water damage?
Yes, brick walls can often be repaired if the damage is caught early. Repairs may involve replacing damaged bricks, repointing the mortar, or sealing the wall to prevent future moisture. The extent of the repair depends on how much structural damage has occurred.
How long does it take for water to damage brick?
Water can begin to damage brick within days if it is constantly wet, especially if temperatures drop below freezing. However, the visible signs like spalling or cracking may take months or years to appear. The longer the moisture sits, the worse the damage gets.
What is the right way to dry out a wet brick wall?
Start by removing the source of water and increasing air circulation with fans. Dehumidifiers help pull moisture from the air and the wall. If the wall is saturated, you may need to drill small holes to let the interior dry, but that should be done by a professional to avoid further damage.
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