How to Re-Grout Tile
Remove old, cracked grout and apply fresh grout between tiles
What You'll Need
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Tools
Grout saw or oscillating tool
For removing old grout
Grout float
Rubber float for applying grout
Large sponge
Bucket
Mixing paddle or stir stick
Safety glasses
Dust mask
Materials
Step-by-Step Instructions
Remove old grout
1-3 hours depending on area size
Use a grout saw, oscillating tool with grout blade, or rotary tool to remove old grout. Work at a 45-degree angle to avoid chipping tiles. Remove grout to at least half the tile depth.
Warning
Wear safety glasses - grout chips can fly. Work carefully to avoid cracking tiles.
Clean out the joints
20-30 minutes
Vacuum all grout dust and debris from the joints. Wipe tiles with a damp cloth. Let dry completely.
Pro Tip
A toothbrush or small brush helps clean tight corners.
Mix the grout
10 minutes
Mix grout according to package directions. It should have the consistency of peanut butter. Let it slake (rest) for 5-10 minutes, then remix briefly.
Pro Tip
Only mix as much as you can use in 20-30 minutes. Grout begins to set and becomes harder to work.
Apply grout
30-60 minutes
Hold the grout float at a 45-degree angle. Spread grout diagonally across the tiles, pressing firmly to pack grout into the joints. Work in small sections (3-4 square feet).
Pro Tip
Diagonal strokes prevent pulling grout out of the joints.
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15-30 minutes
After 10-20 minutes (when grout starts to firm up), use the grout float held nearly vertical to scrape off excess. Work diagonally across the tiles.
Sponge clean
30-45 minutes
Dampen a large sponge and wring out well. Wipe tiles in a circular motion to remove grout haze. Rinse sponge frequently. Don't use too much water or you'll weaken the grout.
Pro Tip
You'll need to wipe several times as the grout cures. Let haze dry, then wipe again.
Final cleaning
15-20 minutes
After grout cures for 24 hours, buff remaining haze off tiles with a dry cloth. For stubborn haze, use a grout haze remover product.
Seal the grout
20-30 minutes
Wait 48-72 hours for grout to fully cure. Apply grout sealer according to product directions. This protects grout from moisture and stains. Reapply annually.
Pro Tip
Sealer is especially important in showers and around sinks.
Common Mistakes to Avoid
- Not removing enough old grout (new grout should be at least half tile depth)
- Mixing grout too wet (weakens it)
- Waiting too long to clean (haze becomes permanent)
- Using too much water when sponging (washes out grout)
- Skipping the sealer (grout stains and degrades faster)
Safety Warnings
- Wear safety glasses when removing grout
- Wear a dust mask - grout dust is harmful to breathe
- Wear gloves - grout is alkaline and dries out skin
When to Call a Professional
If tiles are loose or damaged, if there's water damage behind the tiles, or for large areas like entire bathroom floors.
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Frequently Asked Questions
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Project Overview
- Difficulty
- Intermediate
- Time
- 3-6 hours (for typical bathroom)
- Est. Cost
- $20–$60
- Tools
- 7 items
- Materials
- 3 items
- Steps
- 8
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