07/26/2026
🚨 A Musty Smell Turned Into a Hidden Plumbing Leak…
This project in Argyle, Texas started with a simple maintenance request from one of the property management companies we work with. The tenant noticed a faint musty smell under the bathroom sink, along with one small discolored spot inside the cabinet.
Honestly, it would’ve been easy to dismiss.
Instead, we opened the wall.
What we found was a slow leak from a failed PEX tee crimp. The leak wasn’t dripping directly onto the drywall, so there weren’t obvious water stains. Instead, the water was slowly wicking into the insulation, allowing moisture to spread throughout the wall cavity. Over time, that hidden moisture created widespread mold growth behind the cabinet backing—far beyond what was visible from the outside.
One of the biggest clues wasn’t even inside the house.
If you look at one of the photos, you’ll see water staining on the exterior foundation directly below the bathroom. That water was actually making its way through the wall and out the foundation.
💡 Homeowner Tip: If you ever notice water seeping from your foundation, brick mortar joints, or siding in one isolated area—especially when it hasn’t rained—that isn’t normal. Water shouldn’t be escaping from inside your home. Have it investigated before it turns into a much larger (and more expensive) repair.
Here’s what we did:
✔️ Located and replaced the failed PEX tee.
✔️ Pressure-tested the plumbing to confirm the leak was resolved.
✔️ Removed all damaged drywall, insulation, and cabinet backing.
✔️ Performed mold remediation treatments.
✔️ Allowed the wall cavity to dry and verified moisture levels with a moisture meter.
✔️ Extended the drying process when readings were still too high (don’t rush drying—it’s critical).
✔️ Installed new insulation and drywall.
✔️ Taped, bedded, primed, and refinished the repair.
✔️ Primed and refinished the cabinet base after removing damaged material.
✔️ Left the plumbing wall accessible at the owner’s request for easier future inspections and maintenance.
This project is a great example of what we mean when we say Lynnmar Services isn’t just a handyman company. We solve problems from start to finish.
🔧 Plumbing repairs
🛠 Drywall repair
🎨 Painting & finishing
🚪 Cabinet repairs
💧 Leak detection
🏠 Water damage restoration repairs
Water is one of the biggest enemies of any home, but catching a leak early can save thousands of dollars in repairs. If something smells “off,” don’t wait until the damage becomes visible.
If you’re in Argyle, Denton, Flower Mound, Highland Village, Krum, Corinth, Lewisville, or anywhere in Denton County, we’re here to help.
Lynnmar Services
“Denton County’s Trusted Handyman.”
Call or text: 940-536-3290
https://www.lynnmarservices.com