Shower Leaks: Common Causes, Big Consequences

An example of grout failure

In a recent job in Florissant, we uncovered extensive water damage behind a homeowner’s shower wall. What started as a small leak had quietly rotted out the entire deck around the adjacent tub—adding thousands in unexpected repairs. At McBride Construction, it’s not uncommon that we see leaks that go unaddressed until it’s too late. This article explores why shower leaks are so concerning, common causes, and what homeowners should do the moment they spot the warning signs.

Shower leaks are more common than most people think—and the damage they cause often spreads well beyond the bathroom. Leaks can soak into sub-floors, creep behind drywall, and even affect ceilings and electrical systems in rooms below. The longer the leak goes unnoticed, the higher the repair bill climbs. What could have been a simple repair often turns into a much bigger—and costlier—project.

Causes of Shower Leaks

So what causes a shower to leak in the first place? Often, it’s a combination of aging materials and everyday wear and tear. Over time, seals, grout, caulk, silicone, or the shower valve itself naturally degrade. In other cases, the original shower may have been installed using subpar materials or rushed workmanship.

Sometimes a client finds a unique way of breaking something in the shower. Home settling can also cause subtle shifts that lead to cracked tiles or broken seals. Even things like DIY repairs or damaged plumbing connections can let water slip through and wreak havoc behind the walls.

That’s why it’s critical for homeowners to act at the first sign of a leak—even if it seems minor. A musty smell, peeling paint, or a soft spot near the shower could signal a much bigger problem hidden behind the wall. The sooner the issue is diagnosed, the better the outcome—and the less it will cost to fix.

What to Do for a Shower Leak

If you suspect a leak, the best thing you can do is stop using the shower immediately—especially if water is visibly escaping into areas it shouldn’t. Then, call a qualified contractor to assess the situation. Don’t assume it’s something you can live with or fix on your own.

McBride Construction can often provide temporary solutions—such as moisture barriers or sealing measures—to help minimize damage until a full repair or remodel can be completed. The longer you wait, the more damage water can do behind the scenes—and the more expensive it becomes to repair.

Call McBride Construction

Whether it’s replacing water-damaged framing, upgrading a failing shower valve, or rebuilding a leaking wall, McBride Construction handles every part of the job. We work with trusted specialists for mold remediation if needed and use only top-tier waterproofing materials and sealants. Our goal is to stop the leak—and build something better that lasts.

At McBride Construction, we’re proud to help our neighbors protect their homes with quality workmanship and honest advice. If you suspect a leak or want to update your shower, we’re just a call or click away. Reach out at 636‑393‑8603 or send us a message online to schedule your free consultation—we’re here to help, start to finish.