Stucco rarely fails overnight — it sends warnings first. Catch these five signs early and you will save thousands.
1. Cracks Wider Than a Credit Card
Hairline cracks under 1/16 of an inch are usually cosmetic. Anything wider is an open door for moisture — and in Colorado, moisture plus freezing temperatures equals fast-growing damage. Diagonal cracks radiating from window and door corners deserve immediate attention because they often indicate movement in the structure behind the stucco.
2. Water Staining Below Windows
Dark vertical streaks below window sills after rain or snowmelt mean water is finding a path behind the stucco, usually through failed sealant joints. This is the most common stucco failure we see in Denver, and one of the most damaging when ignored — the water rots the sheathing you cannot see.
3. Bulging or Bubbling Sections
When stucco separates from the lath behind it, gravity pulls the loosened section outward, creating a visible bulge. Tap it and you will hear a hollow sound. Bulging stucco can detach and fall, so treat it as both a water problem and a safety issue.
4. White Chalky Deposits (Efflorescence)
Those white, salty streaks are minerals left behind as water migrates through the stucco and evaporates. Efflorescence itself is harmless, but it is proof that water is moving through your wall — and you need to find out where it is coming from.
5. Missing or Damaged Sealant Joints
Walk your home once a year and look at every joint where stucco meets windows, doors, flashing, and trim. Cracked, shrunken, or missing sealant is the cheapest repair on this list, and fixing it prevents nearly every problem above.
See any of these signs on your home? MBG STUCCO LLC provides free repair estimates across the Denver metro, with honest assessments and precise color matching.
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