Should porcelain tile grout be sanded or unsanded?

Author: Sonya Macejkovic  |  Last update: Thursday, June 25, 2026

Because sand has a significant grit, there is a higher chance of it scratching delicate tiles such as marble or limestone. Sanded grout is best used with floor tiles, ceramic tiles, natural stone tiles, and porcelain tiles.

Is sanded or unsanded grout better for porcelain tile?

In this blog, I will discuss when to use sanded grout and when to use unsanded grout and some of the benefits each have. Sanded grout is recommended for any install using ceramic, porcelain, granites, flamed or brushed marble, terrazzo, rock pebbles or meshed pebbles with a 1/8" or up grout joint.

What type of grout is best for porcelain tile?

Epoxy grout is generally considered the best option for porcelain tile due to its superior durability, stain resistance, and waterproof properties. It's particularly well-suited for high-traffic areas, kitchens, bathrooms, and outdoor installations where moisture and staining are concerns.

How do you tell if grout is sanded or unsanded?

There's a difference in look because sanded grout has, surprise, sand in it that is visible. The texture is rougher and gives more dimension. Unsanded is pretty smooth and probably better used where the grout lines are thin.

Can you use normal grout on porcelain tiles?

For porcelain patios, you will need to use an exterior paving grout (Pavestone Exterior Tile Grout). Most tubs of paving grout come with multiple bags of powdered mix. These allow you to make up smaller batches of grout when pointing your patio.

This Grouting Mistake will Ruin Your Tile Job

Does porcelain tile grout need to be sealed?

It is not necessary to seal any glazed tiles or good quality un-polished porcelain tiles; however, once again we recommend the use of a grout protector if you want to protect the grout to keep it looking its best and to make ongoing maintenance easier.

What is the best grout for outside porcelain tiles?

Epoxy grout is a highly durable and waterproof option for outdoor porcelain tiles due to its composition of epoxy resins and hardeners. It exhibits excellent resistance to stains, chemicals, and extreme weather conditions.

Should you be able to scratch grout with a fingernail?

If you can scratch grout out with your fingernail, you might need a re-grout. If your tiles are falling off, you need a re-grout – and maybe a re-tile! If your tiles are cracked and you have signs of water damage, you probably need a re-tile, re-grout, new backer board, and wallboard too!

Can you grout over grout?

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 best grout for bathroom tiles?

Epoxy grout is a better choice for showers, kitchen, bathrooms, and other damp areas because it is stain resistant and requires no sealing, unlike cement-based grout.

Is there a special mortar for porcelain tile?

ANSWER. ANSWER - Porcelain Tile should be installed with a latex modified thin-set or a polymer modified thin-set. The Custom Marble Granite Mortar I believe is a polymer modified thin-set. For larger tiles 12x12 or larger should use a 1/4" sq.

Should grout be flush with porcelain tile?

Generally, a flush joint is desired on any square-edged tile (including rectified tile), but the ANSI standard found in A108. 10 section 5.3. 4 states, “All grout joints shall be uniformly finished.

Can you lay porcelain tile without grout lines?

When installing no grout tiles you must choose large-size rectified porcelain stoneware tiles, a special finish that makes the edges perfectly smooth and eliminates any imperfection: this way the slabs will have 90° angles and the contours will be even sharper, thus becoming invisible after installation.

What causes pinholes in grout?

Tiny pinholes or cracks may appear due to your house shifting down a teeny bit deeper into the soil, causing minute changes in the structure. Another reason may be because there was too much water in the grout mix. When that water evaporated, it left behind big holes in the grout that you can see.

How long does porcelain grout take to dry?

Grout is used to fill the gaps between walls, usually tiles, so that they stick together. For grout to work its magic, it should be left to dry for a reasonable amount of time; otherwise, all your efforts will be ruined. On average, grout takes around 24-72 hours to dry.

Do I need to seal sanded grout?

Grout is a cement-based product mixed with chemicals, water, and in many cases sand. Portland cement based grouts are particularly porous. Porous grouts attract water, dirt, oils, etc. While the tile industry does not require sealing, it is always recommended, especially in wet or high-traffic areas.

Do you have to dig out old grout before regrouting?

Before you decide to regrout, evaluate the state of the existing grout. If it's severely damaged, crumbling, or has mold, it may be necessary to remove it entirely.

Why is my grout not sticking?

First, it could have been a structural failure where the floor moved. Or the culprit may have been seasonal movement of a wood-floor system. The installer might have mixed too much water in with the grout or used too much water at that spot in the floor when dressing the joint. Or the grout itself could have been bad.

Do grout pens work?

This really works! The grouting around the tiles in our kitchen and bathroom was looking very tried with several black damp spots. The grout pen covered it all in one coat and was very simple and quick to use. We added an extra coat on the very stained sections and now it all looks like fresh grouting.

When should you not use sanded grout?

Sanded Grout Should Never Be Used For Joints Smaller Than 1/8 Of An Inch. If you try to use sanded grout for a tiling project using joints that are smaller than 1/8 of an inch, you're going to have some serious problems. It's a bad idea to use sanded grout for precision joints that are smaller than 1/8 of an inch.

What does bad grout look like?

Mildew can often show up as a yellowing of grout. Mold and mildew are fungal growths that thrive in damp and humid environments, while Serratia marcescens is a bacterium that is responsible for the pink or reddish-pink discoloration on grout and other surfaces.

Can you apply grout with your finger?

If any gaps or holes appear, apply more grout with your fingertip. Sponge off any excess. Allow the grout to dry for several hours, preferably overnight.

What are the disadvantages of porcelain tiles outside?

The installation process of your outdoor porcelain tile can be time-consuming and physically draining. The material itself is very hard, which makes it difficult to make precise cuts without the special tools available to every professional tiler.

Do you need special grout for porcelain tiles?

Litokol Starlike grout is ideal for porcelain tiles. Starlike grout is a high-quality epoxy grout that is easy to work with and completely non-toxic, making it safe for installers, consumers, pets, and the environment. It's durability makes it ideal for both indoor and outdoor applications.

What gap should I leave between outdoor porcelain tiles?

Determining what gap between porcelain slabs is optimal can be a puzzle for many looking to enhance their outdoor spaces. At Ovaeda, our years of expertise have shown that the minimum gap you should have is 3mm, but to strike the perfect balance for both aesthetics and functionality, we recommend 4-8mm.

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