Is Your Austin Brick House Quietly Leaking Water Behind the Walls After Every Storm?

The Storm Passes. The Damage Doesn't.

It's the morning after a typical Central Texas gullywasher — the kind where wind-driven rain comes in sideways at 50 mph. Your roof looks fine. Your windows look dry. You shrug and move on. But inside the wall cavity behind your brick veneer, water is doing exactly what water does: finding wood, finding insulation, and finding a place to stay.

Brick homes in Austin feel permanent. Solid. Built for the long haul. And that confidence is exactly why moisture problems in brick veneer construction go undetected for years. By the time you smell mildew in the master bedroom or notice soft baseboards near the front door, you're often looking at framing repairs — not just a tube of caulk. This is one of the most underappreciated home improvement issues in the Austin area, and it costs homeowners thousands every year that could have been avoided.

Brick Veneer Is Not Solid Brick — And That Difference Matters

Most Austin homes built after 1980 aren't constructed with solid masonry walls. They're built with a wood-framed wall, a weather-resistant barrier (or building paper), a one-inch air gap, and then a single layer of brick on the outside. That's called brick veneer — and it's designed to drain water, not block it entirely.

The system works beautifully when it's installed correctly. But when the drainage plane fails — flashing fails, weep holes plug up, or sealants crack after years of Austin's brutal heat-freeze cycles — that one-inch cavity becomes a trap. Water gets in but can't get out. And it has nowhere to go except into the wood framing behind it.

Understanding this is key. Building Science Corporation, one of the most respected building enclosure research organizations in the country, has documented extensively how drainage plane failures — not bulk water intrusion through brick itself — are the primary cause of moisture damage in veneer construction. The brick isn't the problem. The system behind it is.

The 6 Places Water Is Most Likely Getting In Right Now

After working on Austin-area exteriors through hundreds of post-storm inspections, there are six entry points that show up again and again. Most homeowners have never even heard of a few of these.

1. Weep Holes That Are Blocked or Missing

Weep holes are the small open vertical joints at the bottom course of brick — they're supposed to drain accumulated moisture out of the cavity. In older Austin homes, builders sometimes filled them in for aesthetics, or debris and paint have plugged them over the years. When water can't drain out the bottom, it migrates sideways and inward.

2. Failed or Missing Lintels

Every window and door in your brick wall has a steel or precast lintel above it supporting the brick load. When that lintel rusts and expands, it cracks the mortar above openings — creating a direct channel for water to enter. Look for stair-step cracks above window corners. That's often lintel rust at work.

3. Window and Door Flashing Failures

Builder-grade window installs from the 1990s and 2000s frequently used sealant alone at the rough opening — no proper pan flashing, no back-dam, no integration with the weather-resistant barrier. Sealant lasts 7–10 years at best in Austin heat before it shrinks, cracks, or debonds. Once it fails, every rain event pushes water directly into the rough opening. We recently wrote about exactly this kind of failure — why a brand-new window replacement in Round Rock failed after one storm — and the root cause was missing flashing, not the window unit itself.

4. Roof-to-Wall Flashing at Dormers and Additions

Anywhere a roof slope meets a brick wall is a high-risk zone. Step flashing and counter-flashing at these transitions need to be properly lapped and sealed. In Austin's climate, thermal expansion and contraction cycles work these joints loose over time. A gap you can barely see with a flashlight can admit enough water to saturate insulation and rot a top plate.

5. Hose Bibs, Dryer Vents, and Other Penetrations

Every pipe, wire, and vent that punches through your brick wall is a potential entry point. The sealant around a hose bib or dryer vent may look intact from three feet away and still be letting water behind the brick. These are easy to miss and easy to fix — but only if someone actually looks.

6. Cracked Mortar and Failed Sealant Joints

Mortar joints in Central Texas take a beating. The heat-cold cycles, the clay soil movement, the years of thermal expansion — all of it causes hairline cracks that widen over time. Horizontal mortar joints are especially vulnerable because they naturally collect water. Tuckpointing — repairing those joints with fresh mortar — is inexpensive and highly effective when done before water damage sets in.

What You Can Check Without Climbing a Ladder

You don't need to be a contractor to spot the early warning signs. Here's what to look for inside and outside your home after a heavy storm:

• White chalky stains on brick (efflorescence): This is dissolved mineral salt left behind when water migrates through masonry and evaporates on the surface. It's harmless on its own, but it's a reliable sign that water is moving through your brick system.
• Bubbling or peeling paint on interior walls near windows or exterior corners: Water vapor pushing through drywall does this. It's often mistaken for a humidity problem.
• Soft or spongy baseboards: Run your hand along baseboards on exterior walls. Any softness means the bottom plate or sheathing behind the drywall has already absorbed moisture.
• Musty smell in a specific room that only appears after rain: This is a classic sign of localized moisture intrusion, not a general HVAC or humidity issue.
• Stains on attic sheathing directly above an exterior wall: Check with a flashlight after a rain event. Staining or discoloration on the underside of roof decking near the eaves can indicate water running down inside a wall cavity.
• Warped or swollen wood trim around windows and doors: Exterior casing that's cupping or splitting is almost always water-driven.

If you're seeing two or more of these signs in the same area of your home, the problem is real and active. The question is: where exactly is the water getting in?

When the Problem Isn't a "Roof Leak" or a "Window Problem"

One of the most frustrating experiences for Austin homeowners is calling a roofer who says the roof is fine, then calling a window company that says the windows are fine — and still having water in the wall. Both contractors can be completely correct. Flashing and drainage plane failures don't always originate at the roof or the window unit itself. They originate in the transitions between systems.

A proper diagnosis means following the water — not just inspecting the obvious entry points. Experienced home exterior services contractors use moisture meters to map wet areas on interior walls, then work backward to identify where water is entering at the exterior. Sometimes that means tracing a leak from a wet baseboard back to a cracked mortar joint six feet above and four feet to the left. Water travels.

This is also why a roofing-only contractor or a window-only contractor will sometimes misdiagnose or miss these failures entirely. You need someone who understands how all the systems — roofing, windows, and siding and cladding systems — interact at their transitions. According to the National Roofing Contractors Association, a significant percentage of roofing-related water intrusion complaints are actually caused by flashing deficiencies, not membrane or shingle failures. That stat applies just as directly to brick veneer homes.

What a Real Fix Looks Like (and When to Stop Patching)

The good news: most of these problems, caught early, are targeted repairs — not demolition projects. Tuckpointing cracked mortar, replacing degraded sealant at window perimeters, installing proper step flashing at a roof-to-wall transition, or clearing and reestablishing weep holes — these are skilled but contained scopes of work. The key word is "early."

When water has been entering a wall cavity for multiple storm seasons, the conversation changes. Saturated insulation loses R-value and holds moisture against framing. Mold can establish in as little as 48 hours in a wet cavity. Bottom plates and OSB sheathing rot. At that point, you're not re-caulking a window — you're opening the wall, replacing framing members, and rebuilding the drainage plane from scratch before re-installing the brick or cladding system.

In some cases — particularly around windows where flashing was never correctly installed — the smarter and more cost-effective move is a proper window replacement done with full flashing integration from the start, rather than repeatedly patching sealant that will fail again in five years. A good installer will tie the new window unit into the weather-resistant barrier correctly, something builder-grade installs from two decades ago simply never did.

If your home is showing any of the signs above — especially if you've had stair-step cracks above windows, efflorescence on multiple walls, or that familiar post-rain musty smell — it's worth having an experienced exterior contractor walk your home before next storm season. At Austin Pro Siding, we see these exact failures on a regular basis, and a thorough exterior inspection often identifies two or three problems at once that, fixed together, stop the damage cycle completely.

Don't wait for soft drywall to tell you what a moisture meter and a good flashlight could have found last spring. Schedule an inspection today — before the next storm makes the decision for you.