How Do I Stop Water From Seeping Through Brick?
Last updated October 31, 2026
The short answer
Find the Source First
Before you patch anything, you need to know where the water is coming from. Seepage through brick often starts higher up, from a leaky roof, a clogged gutter, or a cracked downspout. Water runs down the wall and soaks into the bricks, so the visible damp spot may be far below the real problem.
Check the exterior for gaps around windows and doors, damaged flashing, or missing caulk. Look at the ground slope around your foundation. If soil slopes toward the wall, rain runs right at the brick. Redirect downspouts away from the house and add soil so the grade falls away. These simple fixes stop a lot of seepage.
- Inspect roof shingles and flashing
- Clean gutters and downspouts
- Check window and door seals
- Verify ground slopes away from the wall
- Look for cracks in mortar and brick
Repair Cracks and Mortar
Cracked mortar joints are a common path for water. Over time, weather and settling cause mortar to crumble, leaving gaps where moisture enters. Repointing, which means removing damaged mortar and replacing it with fresh material, can seal the wall. This is a job you can do for small areas, but larger sections may need a mason.
Also fill any cracks in the bricks themselves. Use a high-quality masonry crack filler that matches the brick color. If you see efflorescence, a white powdery stain, it means water has been moving through the brick and leaving salts behind. That is a sign you need to address the water source and seal the surface.
Apply a Water Repellent Sealer
A breathable water repellent can help keep rain from soaking into brick while still letting moisture escape from inside. These sealers are applied to the exterior surface and form a clear barrier. Choose a product made for masonry and follow the application instructions carefully. You may need to apply a second coat.
Do not use a paint or sealer that traps moisture, because that can cause the brick to spall, or flake apart. The goal is to let the wall dry out while preventing liquid water from entering. Test a small area first to see how the brick looks after sealing. Some sealers darken the surface, which may not be what you want.
Improve Drainage and Ventilation
If water keeps seeping, the problem may be below ground. Poor drainage around the foundation can push water against the brick and into the wall. Make sure downspouts extend at least a few feet from the house. You might also install a French drain or regrade the yard to carry water away.
Inside, keep the wall ventilated. Remove anything leaning against the interior brick wall, such as furniture or stored boxes, so air can circulate. If you have a crawlspace, check for standing water there, because that moisture can rise into the brick. Addressing these conditions helps the wall dry and reduces seepage.
When to Call the Pros
Some seepage problems are too big for a DIY fix. If you have tried the basic steps and water still appears, you may have a hidden leak or a drainage issue that needs professional help. A water damage inspection can identify the true source, whether it is a pipe, a roof, or groundwater.
If water has already damaged your walls or flooring, you may need water extraction and drying to prevent mold. The pros use specialized equipment to dry out the structure and may need to remove damaged materials. Acting quickly reduces the chance of mold and rot. If you live in Rogers, keep your local pros' number in mind for fast action.
- Water damage inspection to find hidden leaks
- Emergency water extraction for standing water
- Crawlspace water extraction if moisture is under the house
- Water-damaged flooring removal if floors are soaked
Water damage does not wait
Phones are answered 24/7 for Rogers and nearby communities.
Call Now (479) 370-1500Frequently asked questions
Can I stop brick seepage by painting the wall?
Painting brick can help if you use a masonry paint, but it may trap moisture inside. A breathable water repellent is usually a better choice because it lets the wall dry. If you paint, make sure the wall is clean and dry first.
Does efflorescence mean the brick is damaged?
Efflorescence is a white salt deposit left when water evaporates from the brick. It does not harm the brick itself, but it signals that water is moving through the wall. Fix the water source and clean the salts, then consider sealing the brick.
How long does brick sealer last?
Most water repellents last five to ten years, depending on weather and the product. Check the label for expected lifespan. You may need to reapply after a few years, especially on walls that face sun and rain.