What is the best grout filler for bathrooms?

Author: Eliane Kertzmann  |  Last update: Tuesday, June 23, 2026

When it comes to grouting bathroom tiles, the best joint filler for bathroom is epoxy tile grout! Unlike cementitious grouts, epoxy grout offers superior durability and resistance to stains, chemicals, and moisture.

What is the best grout filler for showers?

With premixed, Spectralock 1 from Laticrete, Flexcolor CQ from Mapei, and TruColor from Bostik are good options.

Can you put new grout on top of old grout?

Yes new grout can be installed on old grout. Make sure the old grout is thoroughly cleaned and then wet before installation. I do this all the time. There is absolutely no need to start over and given the quality of the install you have had so far I would say that starting over might introduce more issues.

What grout do professionals use?

Jim Whitfield, manager of Technical Services at Mapei told industry professionals, “Because epoxy grout is so tough, it wears extremely well. It doesn't wear down over time and become a tile gutter—like cement grout can—where all the dirt and liquid and junk collects.”

What can I use to fill gaps in grout?

A tube of multipurpose white silicone will go a long way to filling a multitude of different gaps around your home. It would certainly be suitable for sealing the gap between the tiles and skirting and the gap at your entryway. You dispense it with a caulking gun.

Best Grout for Tile Showers

Can you fill in missing grout?

Can you fill in missing grout? In most cases, yes. If the surrounding grout is in bad shape, you'll need to do a little more work.

How big of a gap can I fill with grout?

For cementitious grout, joints smaller than 1/8″ generally should only be grouted with unsanded grout, and joints of 1/8″ and larger should only be grouted with sanded grout. Joints larger that 3/8″ usually need a more heavily sanded grout to accommodate the large joint.

What is the filler between bathroom tiles?

Tile Grout is a cement-based material that is used to fill and seal the gaps between tiles during bathroom tile installations. The use of grout in bathrooms is important as it strengthens the tile installation, acting as a barrier between the tile and the wall or floor.

What is the best grout for a bathroom?

Acrylic Grout: Acrylic grout is a great option for wet areas like decks and showers. It's intended to be mildew-resistant and retains its color well. Epoxy Grout: Epoxy grout is less do-it-yourself-friendly than other types.

What do professional tile grout cleaners use?

What do professionals use to clean grout? Whether you believe it or not, most professionals use a solution of white vinegar and water with a 1:1 ratio. This solution is often more effective than dedicated Ph-neutral grout cleaners.

What is the best grout to go over old grout?

Choosing the correct grout is a basic step in the process of regrouting over existing grout. The most common grout types are cementitious (which is unsanded or sanded) or epoxy (which is also sanded or unsanded).

Do grout rakes work?

A dedicated grout rake or a Stanley blade is best for removing existing grout. Grout rakes can be both mechanical and electric. Any electric grout rake is usually 240V and has variable speeds. The Rubi Grout Remover helps to remove grout surrounding ceramic and porcelain tiles.

Why does my shower tile grout keep cracking?

Why Does My Grout Keep Cracking? Frequent grout cracking could result from packing grout after cement hydration has commenced. Too much deflection in the substrate, insufficient grout in the tile joints, excessive water when mixing grout, and inadequate room for expansion also cause the grout to keep cracking.

What grout won't mold in shower?

Epoxy grout is a great choice for showers and moist environments. Epoxy grout is water resistant and made from resins and fillers that help it work like a sealing adhesive.

Is epoxy grout best for showers?

Unlike traditional grouts that can deteriorate over time due to moisture, chemicals, and temperature fluctuations, epoxy grout is resistant to all these factors. It doesn't crack, shrink, or stain, making it a perfect choice for wet areas like showers and bathrooms.

What is better than grout?

Epoxy Grout is a far superior grout than traditional grout and can be used in the same ways as traditional grout products.

What is the best grout for bathrooms?

Epoxy grout: Waterproof, durable, stain- and shrink-resistant. The best grout in shower walls, backsplashes and other surfaces susceptible to moisture or stains. Ideal for use with unglazed and other tiles.

What is used to fill a gap between tiles?

Grout is used to fill spaces in between tiles. Most grout product options come in powder form, but pre-mixed containers are available as well. Whichever option you choose, follow the manufacturer's instructions on how to mix grout.

What is tiles joint filler called?

Epoxy grout is an epoxy-based waterproof tile joint filler (resin, hardener, and filler) that has become the industry standard for tile joint grouting. In the mixing procedure, neither Portland cement nor water is used. A hardener, colours, epoxy resin, and silica fillers are included.

What is the best grout for large gaps?

Sanded grout (fine-sanded grout)

Sanded grout should be used for tile installations with grout joints that are 1/8” to 3/8” wide. Sanded grout is inherently less prone to shrinkage and cracking, which is why it is the best grout for wider grout joints.

Can I grout over grout to fill gaps?

You can apply new grout right over the top of the old grout. To do this, all you need is a grout removal tool. Use the tool to strike out the old grout, making sure the depth is at least 2mm, which is about the thickness of two dimes stacked one on top of the other.

What is the minimum gap for epoxy grout?

What are the minimum and maximum width grout joints for LATICRETE epoxy grouts? LATICRETE epoxy grouts can be installed into joints from 1/16" (1.5mm) to 1/2" (12.7mm) wide. However, since these grouts do contain sand, narrow joints will appear with a coarse texture when compared to unsanded grouts.

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