Leaky slabs
January 31, 2024

Leaky Floors: The Telltale Signs of a Slab Leak

A slab leak refers to a water leak underneath a home's concrete foundation slab. The water remains hidden under the slab, so a person might not know they have this problem. However, some key indicators can tip homeowners off to a leak. Being aware of these signs and acting promptly can help prevent extensive damage.

Slab Leak

Rising Water Bills

A sudden spike in water bills could indicate an underground pipe has sprung a leak. The pipe releases water that seeps into the soil underneath the concrete foundation. This water is still registered by the home's water meter, resulting in higher usage and costs. However, with the leak occurring underground, there may be no visible signs inside the home like flooding. Instead, the only symptom is a drastically higher water bill. For many homeowners, the first and only red flag is opening that monthly utility bill to find water charges have unexpectedly jumped. Getting an inspection and detecting a slab leak early is key to getting repairs done before even costlier damage is done.

Visible Signs of Moisture Damage

Another red flag is patches of moisture or mold on walls or floors. This moisture could be from water seeping up from beneath the foundation. Pay attention to any areas, especially along exterior walls, where the carpet or flooring feels unexpectedly damp. Moisture might also manifest as interior wall surfaces developing mold, peeling paint, or warped spots. These signs provide visual cues that water from a concealed leak is causing damage.

Musty Odors

In some cases, a strong musty odor resembling mildew emerges inside a home with a slab leak. This smell could develop if moisture seeps up between walls or saturates the surrounding soil under the foundation. Be on the lookout for any unusual smells, whether concentrated in one area or generalized throughout the home. A mustiness emanating from the ground is not normal and requires further inspection.

Foundation Cracks and Shifting

Shifting or cracking in the home's foundation provides additional clues. As water flows beneath the slab over time, it can erode soil and destabilize the foundation. Cracks might appear in walls, floors may slope, doors may fail to close properly, and separation can occur where walls meet ceilings. If your home develops new cracks or shifts out of level, suspect an underlying water problem.

Visible Plumbing Issues

Above-ground plumbing leaks do not necessarily indicate a slab leak, but they should raise your attention nonetheless. Dripping faucets, frequent clogs, pipes with condensation, and related issues show that your pipes are aging. Old pipes under stress tend to break sooner. Document any plumbing red flags to help determine if underground pipes share the same corrosion issues.

Sinkholes and Ground Caves

In some extreme cases, a significant slab leak causes such extensive soil saturation that the ground develops sinkhole conditions. This manifests as visible depressions or even sudden cave-ins on the property above the leakage site. If you notice any sinkholes or abrupt drops around your foundation, evacuate the home immediately and contact emergency responders. This points to a severely compromised foundation in need of urgent repair.

Stay alert to these common tip-offs of an unseen underground slab leak. While slab leaks stay hidden, their effects make themselves known. Document odd signs, monitor your water usage, watch for foundation issues, and be attuned to abnormal smells or moisture patterns indoors. Early leak detection helps minimize damage and expensive repairs down the road. If you suspect a potential slab leak, enlist a certified plumber to verify whether your home's foundation and pipes need attention. Catching this issue early makes correcting it less costly and invasive.