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what is grout


When installing tiles or stone, it’s important you choose the right type and colour to complete the project. Grout is an essential part of the tile installation process. Choosing the right one can make a huge difference in the end-result of your installation and how it looks, as well as how successfully it behaves over time.

In today’s how to tile blog, we are answering the question: What is Grout? We will explain everything you need to know, why it’s important and how to properly use it.

* Do you want to get the definitive guide to cutting and laying tiles? Click  here and download it for free.
RUBI Electric Grout Joint Scraper


Unlike adhesive, which is primarily used as a binder to lay your tiles on to. The main function for the use of this material, is to act as a filler between your tiles once they have been laid. Its primary function is aesthetic to compliment the tiles. Many of them come in infinite colours to match tile types, as well as natural stone. Floor grouts tend to be more course in nature because they are wearing surfaces and can span over or bridge tile gaps up to 20mm.

Wall grouts tend to be smoother, so that they do not scratch tile surfaces during application. Generally, these materials are applied to floors with a minimum of 3mm spacing. Generally 5mm for large format tiles. Wall tiles start at 2mm or correspond to matching floor tile widths.

The other function is for expansion of the tiles. As tiles and temperatures rise the tiles expand and any slight movements is taken up from the grout. Tiles that demonstrate cracked or linear cracks are usually a result from substrate or background movement.

Grout is an essential part of the tile installation process. It not only helps to add rigidity and strength to your tile installation, forming a strong join that alleviates any minor stresses within your installation.

It also helps protect your work for longer by keeping dirt and debris from getting in-between your tiles and under them, which may disturb the adhesive & cause the tiles to come loose over time.

In addition to this, this material can also help to provide a great aesthetic to your floor. Using opposing shades of grout on your tiles to help them stand out and create a bold statement or in contrast. Grouting with a similar colour to the tiles to blend with the tiles, adding a subtle effect.


When talking about grout, choosing the right one for your tile & floor is key to ensuring you have a successful installation. Different types of grout will be appropriate for different applications. There are three main variations that are available in both sanded & un-sanded varieties:


Epoxy grouts are the most durable choice, due to its resistance to water damage and stains. It is a great choice to use in high footfall areas, or areas where moisture and food will be present such as in kitchen areas and bathroom installations.

*It’s important to note, that unlike other grouts, due to the chemical reaction that comes when mixing the base and activator together, you will have a limited amount of time to finish grouting your tiles before it sets and becomes too hard to work with.

So if you are still new to this, we’d recommend hiring a professional tiler that will have more experience working with this material.

These types of grouts are usually two part and also impervious once applied, generally coping with any surface debris which is easily removed with appropriate cleaners to restore their full colour. They are best applied by professionals since they are slightly different to apply and have a shorter working window when the two components are mixed.

Cementitious grouts:

These are normally polymer modified grouts and range in many colours which can be applied both inside and outside including fully submersed conditions. Generally, these are easier to apply.


Sanded grout is cement-based, where sand material is added to the mixture to bond. This helps create a bond that is very durable and more resistant to shrinking and cracking unlike un-sanded grout which can pull away from tiles. As the mix dries, the sand becomes locked into place, becoming more stiff. Sanded grout is the best choice for the majority of your flooring installations, as it can handle the higher footfall, as well as being used for larger tile joints.

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Un-sanded grout is a much stickier substance due to it containing no sand or aggregate added to it. As un-sanded grout will shrink as it cures, it is most commonly used on walls with joints measuring 1/8” of an inch or less.

This will allow you to easily fill the lines between your tile easily and with more precision, unlike sanded grout which will be difficult to apply in these small areas due to its consistency being quite bulky.

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Deciding on the colour of grout you want to apply can be a tricky decision. There are not only many different options and colours to choose from, but you also need to take into consideration the maintenance and overall impact your grout lines will have on the design of the room. For example, a lighter colour can make stains in your lines more visible and require more maintenance in keeping them clean.

Darker grout lines will help to hide these stains and additional build of dirt, however it can be prone to fading as well and give your room a more ‘worn’ feel in less time.

If you want the colour or design of your tiles to draw the eye and be the centre of attention, we suggest closely matching the colour or tone of your grout lines to your tiles. This will prevent the eye from being drawn away from the tile itself and make the lines around your tile more subtle.


Sealing your line is particularly important when using a light-coloured grout or working in rooms with a lot of moisture such as kitchen or bathroom areas. The only type of grout that doesn’t need to be sealed is epoxy which is impervious.


One of the final but equally important steps is knowing how to grout your tiles. Grouting can only be applied once the tiles are fixed in place and the adhesive has completely dried.

For this you will require a grout float. For your grouting needs, check out our range of floats here!

The time to dry can vary depending on the type of adhesive you’ve used, so follow the manufacturer’s advice on the packaging. Once you’ve confirmed your grout colour & have mixed it to the manufacturer’s instructions, use your grout float, to spread the over the tiles.

Holding the float at a 45-degree angle, work it into the joints between the tiles, making sure to fully cover the joints.

As you finish grouting each section of your floor or wall, run over the tiles with a damp sponge. This is to make sure you remove any excess grout and clean the tile before it dries and becomes too difficult to remove any residues over the tile.

Our RUBICLEAN PRO Kits are equipped with a sponge & grout float, trowel & RUBIClean Pro washboy! All the key tools you will need to lay & grout your tiles.


Once you’ve completed your tiling project and fully grouted all your joints, use a grout protector spray to help stop any stains or penetration.

Particularly in areas such as kitchens and bathrooms, your tiles will be vulnerable to water, dirt, oil, grease and limescale. Using a protective spray will help to prolong the life of your grout lines, making the area easier to keep clean.

We hope you found our blog useful! To get up to date information on future blogs and product releases, sign up to our mailing list! 

For more of our Tiling Ideas, click here!

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