Mixing tile grout properly is essential for achieving a beautiful and durable tiled surface. With the right techniques and materials, you can create a grout that completely fills joints, resists cracking and staining, and enhances the look of your tilework. Here is a step-by-step guide to mixing tile grout for flawless results.
Choose the Right Grout
There are several types of grout to choose from:
- Cement-based grout – A powder that is mixed with water. It provides a strong, economical option but requires sealing to resist stains. Look for polymer-modified versions for increased flexibility and water-resistance.
- Epoxy grout – A chemical grout made from epoxy resins. It provides extremely durable, stain-proof joints but can be difficult to work with.
- Ready-mixed grout – A pre-blended cementitious grout that only requires water. It offers convenience but has less flexibility than cement-based mixes.
Consider the location, tile type, spacing between tiles, and color when selecting a grout. For most tile projects, a polymer-modified cement-based grout is a good choice. Match the grout color to your tile for a seamless look.
Gather Materials and Tools
To mix and apply grout, you will need:
- Grout powder or epoxy grout kit
- Bucket for mixing
- Stir stick
- Measuring cup
- Grout float
- Grout sponge
- Clean water
- Grout sealer (for cement-based grout)
- Grout haze remover (optional)
Make sure all materials are on hand before mixing.
Calculate How Much Grout is Needed
To find the amount of grout needed:
- Measure the length and width of the tiled area in feet
- Multiply length x width to get the square footage
- Subtract the area of any protruding tile edges
- Multiply the square footage by the grout joint depth to get cubic footage
- Refer to product packaging for grout coverage per cubic foot
- Add 5-10% extra to account for waste and touch-ups
For a 12×12 foot tile floor with 1/8 inch grout joints, approximately 1.5 pounds of grout per square foot would be needed, so 18-20 pounds total should suffice.
Having a bit extra grout is better than running short in the middle of application.
Mix the Grout
Follow product instructions for mixing procedures. In general:
- Cement grout – Slowly add powder to water in a bucket while stirring constantly. Mix to a thick peanut butter consistency. Allow to slake for 10 minutes then remix before use.
- Epoxy grout – Combine resin and hardener according to package directions. Stir thoroughly for an even distribution of color.
- Ready-mixed grout – Simply add water per manufacturer’s instructions, usually 16-32 oz. per pound of powder.
Only mix enough grout that can be applied within the working time of the product, usually 30-90 minutes.
Apply the Grout
Before applying, dampen the tiles slightly to prevent absorption of water from the grout. Use a grout float or rubber grout float to fully pack the joints by holding at a 45° angle and applying pressure.
Scrape off excess grout with the edge of the float. Be sure joints are completely filled to avoid low spots. Go over the area several times from multiple directions to work the grout into corners.
Clean Excess Grout
Once grouted, allow the grout to firm up. This time varies by product from 10 minutes up to an hour. Use a damp grout sponge in a circular motion to lightly smooth joints and remove excess film. Rinse the sponge frequently.
Avoid excessive wiping or you may pull grout out of the joints. Allow to dry an hour or two before polishing with a soft cloth.
Apply grout haze remover if needed per product instructions. Change rinse water often to keep grout residue from redepositing.
Cure and Seal the Grout
Cement grouts require proper curing and sealing for best durability and stain resistance.
- Allow 24-72 hours curing time before sealing, depending on product.
- Apply a penetrating sealer according to label directions. Re-apply yearly or as needed.
Epoxy and pre-mixed grouts do not require separate sealing. Follow all manufacturer instructions for curing.
Proper grout installation will provide a finished look that highlights the beauty of your tile. Taking time to correctly measure, mix, and apply grout is worth the effort for lasting results. Let the grout fully cure before extensive cleaning or use. With the right techniques, you can achieve perfectly grouted tile joints.
Frequently Asked Questions
What is the ideal consistency for tile grout?
The best consistency is like thick peanut butter – firm enough to pack fully into joints without sagging or dripping. Adjust water amounts when mixing powder grout to achieve this texture.
How soon can I walk on newly grouted floors?
It’s best to wait 24-48 hours for cement grout to cure before walking on it. Epoxy grouts often need only 6-8 hours. Check manufacturer guidelines for recommended cure times.
Why is my grout cracking?
Cracking can be caused by inadequate joints, improper grout installation, substrate movement, excessive water in the mix, or failure to seal cement grout. Careful prep and installation helps prevent cracks.
How do I get dried grout haze off tile?
Use a grout haze remover product or mix 1 part white vinegar with 1 part water. Apply liberally, let sit for 5 minutes, then scrub with a nylon pad and rinse. Repeat as needed.
Can I change the color of my existing grout?
Yes, you can apply a colored grout stain or paint over existing grout lines to change the color. Be sure to prep and seal the grout first for best results.
Conclusion
Well-grouted tile creates attractive floors, walls, countertops and other surfaces. By selecting quality grouting materials, measuring quantities accurately, properly mixing and applying the grout, and allowing for proper curing time, you can achieve perfectly grouted tile joints that will last for years to come. Paying attention to the details in each step of the process helps ensure professional looking results.
