Tile Floors and Hidden Water Damage

Grout lines are porous, and tiles meet walls and cabinets at edges that are not sealed. Water on the surface finds these paths and reaches the slab underneath, where it spreads out and soaks the bottom of walls.

Darkened grout lines that stay dark, tiles that sound hollow when tapped, loose or cracked tiles, swelling baseboards and damp drywall at the bottom of walls.

Near toilets, tubs and showers, dishwashers, refrigerators, washers, water heater closets and sliding doors in monsoon storms.

Tiles that sound hollow may have lost their bond to the slab, sometimes from water underneath. They can crack or pop up later.

A provider uses moisture meters and a thermal camera to see how far water spread under tile, often further than the visible wet spot.

Tile slows drying because water can only leave through grout and edges. Removing baseboards and drying from the edges, plus dehumidifiers, usually dries the slab. Badly damaged or loose tiles may need to come up.

Water trapped under tile and behind baseboards in a dark, still space can grow mold. A musty smell near a wall after a leak is a reason to check.

Stop the water, wipe up what you can, photograph and call. See water extraction.

Failed grout and caulk around tubs and showers let water reach the slab and wall bottoms every time someone showers. A soft spot near the tub, darkened grout that never dries or a musty smell are signs. Regrouting and recaulking prevent most of it.

Dishwasher and sink leaks run under cabinets and spread beneath tile toward the nearest wall. Swelling at the bottom of the sink cabinet or a stain on the toe kick are early clues.

Washer hoses and water heaters sit right on the slab. Water spreads under tile into hallways and bedrooms. A drain pan, braided hoses and a leak sensor reduce the risk.

Monsoon rain can enter at slider tracks and soak the tile and baseboards nearby. Keep tracks and weep holes clear.

After drying, loose or hollow tiles can be lifted and reset with fresh thinset. A tile setter can match grout color.

If you have spare tiles from the original install, keep them. Matching discontinued tile is often the hardest part of a repair.

If tiles must be replaced and the original is discontinued, policies differ on whether they pay to replace matching tile in connected rooms. Ask your insurer early and keep spare tiles if you have them.

Call when a leak spread past where you can see it, baseboards swelled, grout stayed dark or a musty smell appeared. Meters show where water went.

Once a season, look at grout near tubs, toilets and the kitchen sink and press baseboards near wet areas. Small changes are easier to catch when you look regularly.

Grout that stays darker than the rest after a spill dried is often still wet underneath. A moisture meter confirms it. Do not regrout or seal over wet grout; dry it first.

Tap tiles near a past leak with a coin. A hollow sound means the tile has lost its bond, often from water. Hollow tiles may crack later; a tile setter can reset them after drying.

Tile itself does not absorb much water, so the surface can look dry while the grout, thinset and slab or subfloor underneath stay wet. Water moves under tile along grout lines and spreads well beyond the visible spill. Baseboards and drywall at the edge of the room can wick it upward. A moisture meter and a thermal camera show where water traveled. Drying under tile takes air movers, dehumidifiers and sometimes small holes drilled in grout lines to push dry air beneath. Ask the provider how they plan to dry under the tile rather than just the surface.

Dry tile on top does not mean a dry floor. After any leak near tile, have moisture checked under it before regrouting, resealing or covering it with rugs or furniture. Catching hidden water early prevents loose tiles, cracked grout, odors and mold later, and keeps repair costs small.

Tile resists water on top, but leaks still reach the slab and walls. Have any significant leak checked with meters.

Questions about tile floors and hidden water damage? Call (623) 269-9046 to reach a local Avondale provider, 24 hours a day.