Why are my floor tiles popping up?
Floor tiles pop up when they lose their bond to the floor underneath. The usual causes are a floor that flexes, moisture in the subfloor, missing movement joints, or too little adhesive behind the tile. Tap the tiles to find how far it goes, look for water, and reset a single loose tile only once the cause is fixed.
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By Kasra Taheri, Founder, LoclisPublished
Researched and drafted with AI, then checked claim by claim against the sources listed below before it was published. Prices and rules change; the dates beside each source say when it was last checked.
Step by step
Read when to stop and call a pro, further down this page, before you start.
Step 1: Keep traffic off and mark the tiles
Stay off the loose tiles and mark each one with painter's tape so you can see whether the problem is spreading.
Step 2: Tap-test the area
Tap the tiles around the loose one with the handle of a screwdriver. A dull, hollow sound means that tile is no longer bonded, even if it still looks flat.
Step 3: Look for water
Check for a leaking pipe, appliance or drain nearby, a damp crawl space below, or a wet or soft patch in the subfloor, since problems can occur in plywood substrates when subjected to moisture.[3]
Step 4: Look for movement
Check for tiles tented upward along a wall or doorway, and for cracked grout, which Laticrete lists among the signs of missing movement joints, deflection and too little thin-set.[1]
Step 5: Fix the cause first
Do not re-stick a tile onto a floor that is still wet, flexing or moving; it will lift again. If the cause is a one-off, such as a dropped object or a fixed leak, go on to the next step.
Step 6: Remove the grout and lift one loose tile
Wearing goggles, remove the grout around the loose tile, carefully break it out with a hammer and chisel, and clear the hard adhesive from underneath.[4]
Step 7: Reset and re-grout
Set a spare tile in fresh thin-set, spread so the whole back is covered, let it cure, then re-grout.[4]
Start by finding out how far it goes
A tile that pops up has lost its bond to the floor beneath it. Which tile that is matters less than why. One loose tile near a doorway has a different cause from a whole room of tiles that sound hollow.
Laticrete's troubleshooting guide for tile on cement backer board lists these causes of loose tile: deflection in the substrate, improper installation of the backer board, the wrong thin-set, movement or settlement of the substrate, and a lack of movement joints.[1] It also lists a floor stressed before the recommended curing period, thin-set that dried out before the tile was laid, kiln release or residue on the back of the tile, and not enough thin-set on the back of the tile.[1] Several of those are installation faults rather than wear.
The usual causes
A floor that flexes. Tile does not bend, so a floor that bounces under foot cracks the bond. For tile on cement backer board, Laticrete says a substrate deflection rating of L/360 must be met to accept tile.[1] If the floor feels springy, or the tiles that lifted sit over a long span of joists, the floor is the problem and the tile is only showing it.
Moisture. Problems can occur in plywood substrates when subjected to moisture.[3] A slow leak from a dishwasher, toilet or drain, or damp air from a crawl space, swells and then shrinks the wood. Custom Building Products says all joists, supporting structure and plywood surfaces shall be dry prior to installation of ceramic tile, as any shrinkage occurring after the installation will result in bond failure.[3]
No room to expand. Laticrete lists a lack of movement joints as the cause of tiles tenting.[1] Tiles that rise in a peak along a wall or across a doorway are the classic sign. The question is not whether movement joints are needed; that is a simple yes.[2] A sunny room moves more: an interior space exposed to direct sunlight will have more significant temperature fluctuations, and the joints should be more frequent, every 8 to 12 feet.[2]
Not enough adhesive behind the tile. Tiles larger than 8 inches by 8 inches require back-buttering for proper installation.[1] The same guide says to spread only enough thin-set mortar that can be covered within 15 to 20 minutes,[1] because mortar that has skinned over does not grip. Tile laid on a bed with voids behind it sounds hollow.
What to do before you touch a tile
Tap-test the tiles around the loose one with a screwdriver handle and note where it sounds hollow. Look at the room for water sources and check the floor below if you can reach it. Check the grout lines and the edges at walls and doorways for cracks and lifted ridges.
If it is a single tile, the cause is clear and gone, and you have a spare, you can reset it. Daltile's method is to remove the grout around the broken tile, carefully remove the broken tile using a hammer and chisel, then remove the hard mortar or adhesive that was underneath the tile.[4] Wear goggles for all of it. Cutting tile can produce silica dust, which can be hazardous if inhaled, and wet cutting methods are best.[4] Reset the tile in fresh thin-set, let it cure, and re-grout. This is why Daltile recommends buying approximately 10% more tile than you expect to need and keeping it as attic stock.[4]
Stop and call a pro if
- More than a few tiles are loose or hollow. A wide area means the bond or the floor has failed, and spot repairs will not hold. A tile installer can tap-map the floor and tell you how much has to come up.
- The floor flexes or feels soft. The structure, not the tile, needs fixing, and that can mean carpentry before any tile goes back.
- There is a water source you cannot find or fix. Stop and get a plumber to trace it before anything is reset.
- Tiles are tented along walls or across rooms. Fixing it means cutting relief joints into the field, which is work for a tile installer.
- The job is a whole room. DPOR says a valid Virginia contractor's license is required when the work is valued at $1,000 or more.[5]
When a floor has to be relaid, the movement joints are cut where they should have been, and the movement joint should not be grouted with cement-based grout; it is kept open while the rest is grouted, then filled with a compressed backer rod and a flexible sealant.[2]
Getting help in Virginia
If you are weighing the repair against a bigger job, read how much tile installation costs in Virginia, and for the bigger picture on durability see how long each kind of flooring lasts. A hollow or flexing floor may also need levelling or subfloor work: should I hire a pro to level a floor before new flooring. Browse flooring pros on Loclis, or read more flooring and tile answers.
To have a licensed local installer look at the floor and quote the repair, describe your tile problem.
Common questions
- Can I just glue a popped tile back down?
- Only if you have found and fixed the reason it came loose. Lift the tile, clear the old adhesive from the floor and the back of the tile, and reset it in fresh thin-set with full coverage. Gluing it onto a floor that is still wet, flexing or moving only buys a few weeks.
- Why do tiles lift up in a tent shape along a wall?
- Laticrete lists a lack of movement joints as the cause of tiles tenting. Tile and the floor under it expand and shrink with temperature and humidity. With no gap at the walls and no joints across a large floor, the pressure has nowhere to go, and the tiles push up.
- Are hollow-sounding tiles about to pop?
- Often, yes. Laticrete's guide lists hollow-sounding tile as a complaint with many of the same causes as loose tile, such as too little thin-set on the back. A few hollow tiles in a field that is otherwise solid can be left alone and watched; a whole area that sounds hollow usually means the bond has failed more widely.
- Will the tiles keep popping if the floor flexes?
- Yes. Laticrete says a substrate deflection rating of L/360 must be met to accept tile, and a bouncy floor does not. Resetting tiles on top of it will not hold, so the floor structure has to be stiffened first, which is a carpenter's job.
Sources
- [1] Thin-Set Troubleshooting Guide for Cement Backer Board Substrates (TDS 208), LATICRETE International. Checked October 27, 2026.
- [2] Movement Joints in Tile Assemblies, Technical White Paper WP104, Custom Building Products. Checked October 27, 2026.
- [3] TB22, Installation of Ceramic Tile over Plywood Substrates with Latex-Portland Cement Mortar, Custom Building Products. Checked October 27, 2026.
- [4] Frequently Asked Questions, Daltile. Checked October 27, 2026.
- [5] What You Should Know Before You Hire a Contractor, Virginia Department of Professional and Occupational Regulation (DPOR). Checked October 27, 2026.
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