Why does stucco leak if it looks solid?

Stucco itself is not waterproof. The real water barrier is the building paper and flashing underneath, which act as a drainage plane to weep water down and out. When that layer is damaged or installed incorrectly, water enters the wall cavity — often with no visible exterior damage.

How do you find the source of a leak?

We combine controlled water testing, careful inspection of flashing details, and experience with how Sacramento area homes were built. Water travels, so the entry point is frequently several feet from the interior damage.

How long can a leak go unnoticed?

Years. Water can enter the wall cavity slowly and cause dry rot, mold, and termite-inviting conditions long before anything shows on the interior. That is why unexplained stains or musty smells deserve prompt investigation.

Will my homeowners insurance cover the repair?

Coverage varies by policy and cause. Sudden accidental damage is treated differently than long-term intrusion. We document our findings thoroughly, which helps you have an informed conversation with your insurer.

Water Leak Detection & Repair

A majority of homes in the Sacramento area are built with stucco exteriors, and many develop water leaks — especially around window openings. Finding the true source and repairing it correctly is the key to preventing dry rot, mold, and far more expensive repairs. Leak diagnosis is the heart of what HomePRO does.

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What is water leak detection & repair?

Water leak detection and repair for stucco homes is the process of finding where water enters the wall system — usually at windows, doors, flashing, or penetrations — and permanently correcting the failed building paper, flashing, or drainage plane so water can no longer reach the wall cavity.

HomePRO technician inspecting a stucco wall to locate the source of a water leak — View the gallery

November 2020 cover of El Dorado Hills Neighbors magazine

Water Leaks on Stucco Homes

By Matt Stevenson, HomePRO

Published in the November 2020 issue of El Dorado Hills Neighbors, this article explains why stucco homes develop hidden water leaks, why surface patches often fail, and what a permanent repair requires.

Warning signs to watch for

Staining, bubbling, or peeling paint on interior walls or ceilings
Musty odors or visible mold near windows and exterior walls
Soft, spongy, or discolored drywall below windows
Water stains on stucco after rain, or stucco that stays damp
Warped flooring or baseboards along exterior walls
Cracks combined with rust stains or efflorescence

Common causes we find

Failed or incorrectly installed window and door flashing
Damaged or improperly lapped building paper behind the stucco
Unsealed penetrations — light fixtures, hose bibs, vents, railings
Missing kickout flashing where rooflines meet walls
Improper previous repairs that trapped water in the wall

How we do it right

1
Leak-source investigation
We use careful visual investigation, controlled water testing, and nearly 30 years of experience to trace water to its actual entry point — which is often far from where damage appears inside.
2
Clear findings & estimate
We show you what we found, explain how the water is getting in, and give you an honest written estimate for the correct repair.
3
Open, repair, rebuild
We open the affected area, replace damaged framing and sheathing, install new building paper and flashing correctly integrated with the drainage plane, and rebuild the stucco.
4
Texture match & verify
The repair is finished with matching texture, and we verify the assembly sheds water the way it was always supposed to.

Why homeowners choose HomePRO

Leak diagnosis is our specialty — not a sideline
We fix the cause, not just the symptom
Licensed General Contractor for any structural repairs uncovered
Trusted by homeowners, realtors, and other contractors since 1996