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What Is The Best Grout For Outdoors?

  • April 28, 2022

Laying tiles outside comes with its own set of unique risks and requirements. With rain being a constant issue and weather getting in the way of your tiling job, you may be asking, ‘what is the best grout for outdoor use?’. Thankfully, we have the answer to that exact question below!

Read on to see exactly what grout you should use for your outdoor tiling project and the steps you should take to ensure your garden tiles last a lifetime!

What Is The Purpose Of Outdoor Grout?

Grout that is suitable for outdoor use is designed to withstand rain and other natural elements. This lets you lay tiles in your garden, whether that’s on your concrete stair raisers or a patio design, without worrying about rain damaging the adhesive.

There are various grout products, such as patio grout and paving grout, that can be used outside. Be sure to check whether or not your chosen pre-mixed grout can be used in your garden before you make a purchase!

Types Of Grout

Unsanded grout

Although unsanded grout is a popular choice for laying vertical tiles inside a shower due to its extreme stickiness, it might not be suited for use outdoors. However, if you are only planning on grouting a small area, then unsanded grout can be used.

Just make sure that it is rated ‘no efflorescence’ unless you don’t mind your grout leaving a chalk-like residue across your tile surfaces.

Fine-sanded grout

Fine-sanded grout is perhaps the grout that is recommended for almost any tiling job. It is extremely cheap compared to other grout mixtures, such as epoxy, and is also fairly strong, which is just what you want from a grout.

When wiping away any excess grout, be careful when using your grout float. Due to the small bits of sand, the surface of your tile may get scratched if you rub too hard with your grout float.

Furan grout

Furan grout is one of the best choices of grout for laying quarry tiles and bricks. It’s designed to withstand areas with a high concentration of chemicals, making it suitable for any outdoor tiling job.

However, furan grout is a specialist grout and can be fairly hard to use if you aren’t used to it. Most tilers will use furan grout, so if you need to use it, consider hiring a tiler.

Epoxy grout

Being naturally water-resistant, Epoxy grout is an excellent choice if you plan on laying tiles in your front or back garden. Epoxy grout is made up of a unique blend of a filler powder form grout and epoxy resins, making it the best grout to use for outdoor projects.

It is also almost completely stain-resistant and highly durable. If you expect to be walking on your tiling frequently, then epoxy grouts should be at the top of your shopping list!

Which Grout Is Best For Outdoor Tile Laying?

If you are looking for the best patio grout for outdoor applications, then you would be hard-pressed to find a grout that can compete with epoxy. It is naturally water-resistant, making it incredible for a range of weather types.

Its waterproof nature also prevents mould from building up within your grout joints, ensuring your outdoor tiling consistently looks great.

Should You Seal Grout After Tiling?

Sealing grout once you have finished your tiling project is incredibly important. Once the grout has fully dried, which could be anywhere between 24 to 72 hours, you will want to seal gaps using a grout sealant.

Sealed grout will improve its resistance to general wear and tear and can help ensure your wall or floor tiles last a long time. To keep on top of tile maintenance, you should try to re-seal your epoxy grout at least once a year!


Is there waterproof grout?

When it comes to waterproof grout, the only available option is an epoxy resin grout. Epoxy prevents water from passing through and damaging the adhesive and is perfect for outdoor tiling jobs.

What tile grout is not suitable for outdoors?

Cement-based grout is not suitable for outside use due to how porous it is. Rain will easily damage any cement-based grout and can ruin your grout joints, especially if it is not sealed with a water-resistant sealant.

What’s the best grout sealer?

Sealing grout during your tiling project is incredibly important if you want them to last. For indoor terracotta or rough surfaces, Lithofin Multi-Seal is an excellent choice. If you want to improve the water resistance of your grout, then be sure to check out the Weber Joint Silicone grout sealer!

Is high-quality epoxy grout expensive?

The highest quality epoxy grout can be pretty expensive, especially when compared to concrete or powder form grout. But if you plan on reinforcing masonry and you want the best pre-mixed grouts for use outdoors, then the added cost is almost always worth it!

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