Why Is My Brick Siding Cracking Near the Bottom?
Last updated October 25, 2026
The short answer
Water Seepage and Freeze-Thaw
Water is the most common culprit behind bottom-edge brick cracks. When rain, sprinkler overspray, or runoff soaks into the brick and mortar, it can freeze during cold snaps. Frozen water expands, pushing against the brick from the inside and causing hairline cracks to widen over time.
You might notice efflorescence, a white powdery residue, near the cracks. That is a sign that moisture is moving through the masonry. If the ground slopes toward your home, water pools against the base and makes the problem worse. Check your downspouts and grading first.
- Look for white mineral stains on the brick
- Check if sprinklers hit the wall directly
- See if the soil slopes toward the foundation
- Inspect gutters and downspouts for overflow
- Feel the brick for dampness after rain
Foundation Movement
Brick siding is rigid, so it cracks when the foundation underneath shifts. Soil expansion and contraction, especially in clay-rich areas, can push or pull the base. If you see a horizontal crack near the bottom, that often points to foundation settlement or heaving.
You can test for movement by checking if doors or windows near the crack stick or if interior walls show cracks. A small crack may be cosmetic, but a widening gap or a step in the brick pattern needs attention. A structural professional can assess the foundation.
Leaking Pipes or Sprinklers
A hidden leak under the slab or in an exterior pipe can saturate the soil and the brick. Water from a broken sprinkler line or a leaking hose bib soaks the base of the wall, weakening the mortar. This is especially common near the bottom where the brick meets the ground.
If you suspect a leak, watch your water meter for movement when all fixtures are off. You can also look for unusually green grass or soft spots near the foundation. A water damage inspection can pinpoint moisture sources without tearing up your yard.
Poor Drainage and Downspouts
Downspouts that empty too close to the foundation direct water right onto the brick base. Over time, that constant moisture erodes mortar and encourages cracking. The fix is often simple: extend the downspout so water discharges at least a few feet away from the wall.
You can also improve drainage by regrading the soil so it slopes away from your home. Adding a swale or a French drain can redirect surface water. If the problem persists, a moisture mapping service can show exactly where water is entering.
- Extend downspouts with a flexible hose
- Add soil so the ground slopes away
- Install a rain barrel to capture roof runoff
- Clear debris from gutters to prevent overflow
- Check the irrigation timer for overwatering
When to Call a Professional
If the crack is wider than a hairline, or if you see the brick bulging or separating from the wall, get a professional assessment. A water damage inspection can identify hidden moisture. Structural drying and dehumidification may be needed if water has soaked into the wall cavity.
For safety, avoid leaning on the cracked area and keep children away. If you notice interior water stains or a musty smell, address that too. Keeping your downspout clear and your sprinklers adjusted can prevent many bottom-edge cracks.
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Call Now (801) 383-0232Frequently asked questions
Can I fix brick cracks myself?
Small hairline cracks can be patched with masonry caulk, but you need to fix the water source first. If the crack is structural, patching will not hold. For a proper repair, consult a masonry professional who can repoint the mortar.
Does homeowners insurance cover brick cracking?
Policies vary, and your insurer decides what is covered. Cracks from gradual water damage or poor maintenance are often not covered. Sudden events like a burst pipe may be. Check your policy and talk to your insurance company about your specific situation.
How do I know if the crack is serious?
A crack wider than a quarter inch, one that is horizontal, or one that causes the brick to shift is serious. Also watch for cracks that keep growing or that appear alongside interior wall cracks. A structural professional can determine if the foundation is moving.