Table Of Contents
- 1 Tile Grout FAQ
- 2 Most Common Questions Answered about Tile Grout
- 2.1 Can you put new grout on top of old grout?
- 2.2 What is the best tool to use to remove grout?
- 2.3 What Dremel bit to use to remove grout?/Which Dremel bit can I use to remove grout?
- 2.4 What tool do I use to get rid of caulking?/How do I remove old caulk?
- 2.5 Can you apply caulk over old caulk?
- 2.6 What is the best caulk to use around a bathtub?
- 2.7 What will dissolve grout?/Can I Dissolve tile grout?
- 2.8 What Is The Best Grout Sealer?
- 2.9 How do you remove grout haze from tile?
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Tile Grout FAQ
Most Common Questions Answered about Tile Grout
Commonly Asked Questions About Tile Grout
Can you put new grout on top of old grout?
Answer:Short Answer, no way! Well, there is nothing stopping you from slapping some fresh grout over your dirty old grout, and I am sure people have tried this numerous times. However, I wish you well in making that new grout stick to the old grout and stopping it from not crumbling away within a few days.
You see tile grout is a solid cementitious substance, in order for it to retain structural integrity, (my wife loves it when I use big words) it requires a minimum thickness for it to cure properly and attain proper strength.
There is a reason why your driveway is made out of thick slabs of concrete, if it was just an inch coating on top of dirt it’d crack and fail the first time you drove your car over it.
The same thing applies to tile grout, which is in it’s simplest form is a fine form of cement with added colors and polymers.
When you grout over the top of old grout, first of all, you’ll find you’ll be washing away most of it with your sponge during the wash-up phase.
This will result in you having to reapply the grout and try again. You’ll be repeating this process ad nauseum until you tear up the sponge in anger and declare war on anything tile related.
Remove the old grout to at least half the thickness of the tile. That is the general rule of thumb recommended by most tile professionals and grout manufacturers.
For this example, I suggest using a grout saw or an oscillating multi-tool with a grout removal blade attached. Scratch out either the entirety of the grout or at least half the tile thickness.
Make sure to remove all of the old grout from around the edges of the tile as it’ll be visible when you apply the new grout as dark colored patches of dirt. This will ruin the look of your new grout.
If you are unsure about grouting or the tools needed, I have you covered.
Click here to read my complete and highly detailed guide to grouting and repairing grout. It covers all the tools needed and techniques on how to work with tile grout.
What is the best tool to use to remove grout?
Answer:There are plenty of great tools for removing grout available to purchase, which tool you use all depends on your time and the size of the job. (Click the images for more details plus prices)
If you are only doing a small grout repair job or regrouting a bathroom floor for instance, then a grout saw should be adequate for the grout removing task.
Using a special carbide encrusting blade, it tears it’s way through the tough old grout and effectively grinds it into a fine dust.
It does require a lot of effort from you but it’s still a great grout removal tool on a budget.
If you have a Saturday free then dedicate the time to removing your old grout with this little grout removing tool.
For a quick repair of your shower grout, then this will work great.
What Dremel bit to use to remove grout?/Which Dremel bit can I use to remove grout?
Answer:Questionable English aside, if you really want to use a Dremel to remove grout, I would suggest you go with their dedicated grout removal bit. It is made of solid carbide and specifically designed to cut through all types of tile grout.
What tool do I use to get rid of caulking?/How do I remove old caulk?
Answer:I have seen all sorts of nonsense answers on the internet about how to remove old caulk and it drives me crazy. Most are ineffective or a waste of time, so I want to point you towards the easiest solution THAT WORKS!
Can you apply caulk over old caulk?
Answer:This is a similar question to the one about applying grout over old grout but I want to clarify a few things.
What is the best caulk to use around a bathtub?
Answer:The best caulk to use around a bathtub, shower or any wet area would be one consisting of 100% Silicone rubber. Silicone is designed to stick to most surfaces and most importantly: keep water out and resist mould.
What will dissolve grout?/Can I Dissolve tile grout?
Answer:This is a very broad question as it does not define how thick the tile grout is but I am fairly certain I know what this misinformed soul is asking. Someone is asking what product can be used to dissolve old grout from between tiles. As in, the fully cured cement-hard substance that is between tiles.
What Is The Best Grout Sealer?
While saying anything is the best is very generalist and subjective, especially in a field as diverse as tiling and grout, I feel that Aquamix has created a sealer that covers the widest spectrum.
It is suitable for all forms of sanded grout and all types of natural stone like marble and granite – to name only a few.
With a non-sheen and natural finish, its a popular choice with homeowners that want a unobtrusive sealer.
I go in detail about all sorts of grout and tile sealers in my best grout sealer buyer’s guide. If you are wanting to learn everything you need about grout sealers, be sure to check it out before you purchase one.
How do you remove grout haze from tile?
Answer:Grout haze forms on tiles when it has been allowed to dry onto the surface of the tile during the washing up phase of grouting. This usually happens when the washing up with a sponge has been rushed and the tiles were not fully cleansed of the excess grout applied during grouting.
Epoxy grout is a notorious candidate for grout haze forming on tiles as it’s a real tough one to clean up properly.
Anyone that has worked with epoxy is nodding their heads right about now and are thinking back to the first time they worked with epoxy.
It was great, wasn’t it? Definitely a learning experience.
Porous tiles with a textured surface are also very prone to grout haze build-up as there is literally no way of cleaning them up properly even with copious washing and buffing after.
Okay, so we know the problem.
Here’s the solution!
You can step up the game with hydrochloric acid.
This is a wonder on grout hazing and other mortar hazing as it effectively removes the residue from the tiles.
This is a powerful acid so if you are going to be using it safety clothing is a must!
Safety goggles and long-sleeved clothing are essential to reduce any burns.
While this is not as potent as pure hydrochloric acid/spirits of salts, I urge you to be very careful with this grout haze remover.
Apply with a scouring pad or brush and give it a good scrub before rinsing with copious amounts of water.
If you want to learn how to prevent grout haze, you can read my guide.