Regrouting tired, cracked or stained tile
Quick answer
Cracked, missing or permanently stained grout should be removed to at least half the joint depth and replaced. Regrouting brings tile back to life and keeps water out of the wall, often without replacing a single tile.
Many Monterey Park homes built in the 1950s and 1960s still have original bathroom tile in pastel colors or classic white. The tile often outlasts the grout. Cracked or crumbling grout lets water into the wall behind it.
Signs you need regrouting
- Cracks or gaps in grout lines
- Grout that crumbles when scratched
- Dark stains that will not clean
- Loose tiles
Cleaning first
Removing old grout
We use hand tools and oscillating tools with care, removing grout to a consistent depth without chipping tile edges.
New grout
Sanded grout is for wider joints, unsanded for narrow ones. We match color as closely as possible.
Sealing
Cement grout benefits from a penetrating sealer after it cures.
Corners
Inside corners and where tile meets the tub get caulk, not grout. See recaulking.
Epoxy and urethane grout
Epoxy and urethane grouts resist stains and do not need sealing, which suits busy bathrooms. They take more care to install.
Color choices
Regrouting is a chance to change color. Gray or almond grout hides staining better than bright white.
Floors
Floor grout takes more wear and dirt than walls. Regrouting floors with a stain-resistant grout makes cleaning easier.
After regrouting
Wait the recommended time before showering. Then seal cement grout and reseal yearly.
Signs grout needs attention
Grout is porous by design, so some staining is normal. The time to act is when grout is cracked, sandy to the touch, missing in spots, or pulling away from the tile edge. In a shower, missing grout lets water reach the backer behind the tile.
Mid-century bathrooms were often set in a thick mortar bed, which is durable, but water that gets behind the tile for years can still loosen tiles and feed mold. Press gently on tiles near damaged joints. If a tile moves or sounds hollow when you tap it, the problem has gone deeper than the grout.
Cleaning versus regrouting
Not every dark joint needs replacing. Try a stiff nylon brush with an oxygen-based cleaner first, rinse well, and let it dry for a day. If the grout comes back to an even color and is solid when you scratch it with a key, cleaning and sealing may be all it needs. If it crumbles, regrouting is the fix.
How regrouting works
Old grout comes out with a carbide grout saw or an oscillating tool fitted with a grout blade. The goal is to remove at least two-thirds of the joint depth without chipping the tile edges, which matters a lot with original glazed tile that cannot be matched. We vacuum the joints, wipe them with a damp sponge, and let them dry.
New grout is pressed in with a rubber float held at an angle, working diagonally across the joints so the float does not drag grout back out. After it firms up, the haze is cleaned off with a barely damp sponge. Too much water at this stage weakens the grout and lightens its color.
Our steps:
- Remove old grout to a consistent depth
- Vacuum and dampen the joints
- Pack the new grout diagonally with a float
- Tool the joints and sponge off haze
- Buff the surface when dry and seal if the grout calls for it
Choosing the grout
Sanded grout is standard for joints wider than about an eighth of an inch. Unsanded grout suits very narrow joints and soft, easily scratched tile. Pre-mixed urethane and high-performance cement grouts resist stains better and some do not need sealing.
Epoxy grout is the most stain-resistant, but it sets fast and is unforgiving to install, so it makes the most sense on countertops and shower floors.
Color matters too. Matching the original white or bone grout in a vintage pink, mint or yellow tile bathroom keeps the look intact. Going darker hides stains but shows every flaw in the layout.
Corners and changes of plane
Where a wall meets the tub, where two walls meet, and where tile meets a window sill, use caulk instead of grout. These joints move slightly as the house shifts and as the tub fills and empties, and grout in them cracks within months. A color-matched silicone or siliconized caulk in those joints stays flexible.
Our recaulking guide covers that part of the job.
After the job
Most cement grouts need to cure for about 48 to 72 hours before a shower is used, and sealers usually go on after that. Read the grout bag for the exact times. Ventilation helps every grout last longer, so if your bathroom stays steamy, see our guide on bathroom fan and vent repair.
Sealing and upkeep
Standard cement grout benefits from a penetrating sealer once it has cured. Apply it with a small brush or applicator bottle to the joints only, wipe excess off the tile face, and let it dry. Reseal about once a year in a shower, less often on walls outside the wet area.
A drop of water that beads on the joint means the sealer is still working; water that darkens the grout means it is time to reseal. Skip harsh acidic cleaners, which etch cement grout, and wipe soap residue weekly.
What our visit involves
We clean, remove damaged grout, regrout, clean haze and seal. See regrouting.
Regrouting days on the north side of town usually end with dumplings at Mama Lu's on Atlantic.
Want us to handle it?
Call or text (626) 684-3505, Mon–Sat, 8:30 AM–7 PM. Send a photo and we will give you an upfront quote.
Call or text (626) 684-3505