How to Re-Grout Floor Tile
Remove old grout and apply fresh grout to floor tiles
What You'll Need
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Tools
Grout saw or oscillating tool
Rubber grout float
Large sponge
Bucket
Vacuum or shop vac
Safety glasses
Knee pads
Dust mask
Materials
Step-by-Step Instructions
Remove old grout
1-3 hours depending on area
Using a grout saw or oscillating tool with grout blade, carefully remove old grout from between tiles. Work at an angle to avoid chipping tiles. Remove at least half the depth of the tile for new grout to adhere.
Warning
This is dusty work - wear a dust mask and safety glasses.
Clean the joints
20-30 minutes
Vacuum all grout dust and debris from the joints. Go over the joints with a damp sponge. Let dry completely before grouting.
Pro Tip
Use a shop vac if available - regular vacuums may struggle with grout dust.
Mix the grout
10 minutes
Mix grout according to package instructions. It should be the consistency of thick 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.
Apply grout
45-90 minutes
Spread grout diagonally across the tiles using the rubber float at a 45-degree angle. Press firmly to pack grout deep into the joints. Work in small sections (3-4 square feet).
Pro Tip
Don't spread more than you can grout and clean in 20-30 minutes.
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20-30 minutes
After 10-20 minutes (grout will start to firm), use the float held nearly vertical to scrape off excess grout. Work diagonally to avoid pulling grout from joints.
Sponge clean
30-45 minutes
Dampen a large sponge and wring well. Wipe the tiles in a circular motion to remove grout haze. Rinse sponge frequently. Don't use excessive water.
Pro Tip
You'll need to wipe multiple times as the haze reappears while drying.
Final cleaning and curing
15-20 minutes plus cure time
Let grout cure for 24 hours. Buff remaining haze with a dry cloth. For stubborn haze, use grout haze remover. Avoid walking on the grout for 24 hours if possible.
Seal the grout
20-30 minutes
After 48-72 hours of curing, apply grout sealer according to product directions. This protects the grout from stains and moisture. Re-seal annually.
Pro Tip
Sealer is essential for floor grout which gets heavy wear and potential spills.
Common Mistakes to Avoid
- Not removing enough old grout (new grout too thin)
- Mixing grout too wet (weakens it and causes shrinking)
- Waiting too long to clean (haze becomes permanent)
- Using too much water when cleaning (washes out grout)
- Skipping the sealer (grout stains and degrades)
Safety Warnings
- Wear safety glasses when removing grout
- Use a dust mask - grout dust is harmful
- Wear knee pads - floor work is hard on knees
- Wear gloves - grout is alkaline and irritates skin
When to Call a Professional
If tiles are loose or cracked (may need replacement), if there's water damage under tiles, or for very large areas.
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Frequently Asked Questions
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Project Overview
- Difficulty
- Intermediate
- Time
- 3-6 hours (for typical bathroom)
- Est. Cost
- $25–$60
- Tools
- 8 items
- Materials
- 3 items
- Steps
- 8
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