How do I know if there's water damage behind my shower tiles?

Water damage behind shower tiles often shows warning signs before becoming a major problem. Look for loose or cracked tiles, discolored grout, musty odors, or tiles that sound hollow when tapped.

Visual indicators are your first clue that moisture has penetrated behind the tile surface. Discolored or darkened grout lines, especially along the bottom row of tiles or corners, suggest water infiltration. Tiles that have shifted, cracked, or feel loose when pressed may indicate the substrate has been compromised by moisture. White, chalky deposits on grout lines (efflorescence) occur when water carries minerals to the surface as it evaporates.

Sound and smell tests can reveal hidden damage. Gently tap tiles with your knuckle - a solid, sharp sound indicates good adhesion, while a hollow or dull thud suggests the tile has separated from the wall due to moisture damage. A persistent musty or moldy smell in your bathroom, even after cleaning, often points to moisture trapped behind walls.

In Ottawa's climate, freeze-thaw cycles can accelerate water damage in poorly waterproofed showers. Temperature fluctuations cause materials to expand and contract, creating gaps where water can penetrate. This is particularly common in older homes where modern waterproofing membranes weren't used during original construction.

Professional assessment is recommended if you notice multiple warning signs. A licensed renovation contractor can use moisture meters to detect hidden water damage and determine if the waterproof membrane behind your tiles has failed. Early detection prevents costly structural repairs and potential mold issues.

If you suspect water damage behind your shower tiles, contact Ottawa Bathrooms for a professional assessment - catching these issues early can save thousands in repair costs.

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Ottawa Bathrooms connects you with vetted, licensed renovation contractors from the Ottawa Construction Network:

• CMA Restoration Group inc ✓
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