Our Guide To Dealing With Mouldy Grout

Mouldy tile grout is a common issue, especially in bathrooms, wet rooms and en-suites due to the damp environment. These areas are prone to moisture, creating the perfect conditions for mould growth. Addressing this problem is crucial not only for aesthetics but also for maintaining a healthy living space. Mould can be unpleasant to see and smell, and potentially harmful to health, particularly for those with respiratory issues or allergies.

In this article, we explore exactly how to deal with mouldy grout, from cleaning options to tile grout removal as well as exploring prevention of future mould growth.

Cleaning Mouldy Grout

There are hundreds of grout cleaners on the market, but some of the most popular tile and grout cleaner brands are known for their effectiveness in tackling mould and restoring grout to its original condition. When selecting a tile cleaner, it's important to consider the type of tiles and grout you have, as well as the severity of the mould problem.

Popular Grout Cleaners

FILA FUGANET Grout Cleaner Spray

FILA FUGANET Grout Cleaner is a highly effective spray cleaner designed specifically for grout. It's easy to use and can quickly remove dirt and stains from grout lines. This product is particularly useful for those who prefer a spray application, as it allows for precise targeting of problem areas. The spray format also helps to minimise waste and ensures even coverage.

LTP Grout Stain Remover

LTP Grout Stain Remover is a powerful solution for tackling stubborn stains and mould on grout. It's particularly effective on cement-based grouts, which are commonly found in homes and more domestic settings. This product is ideal for those dealing with long-standing mould issues that haven’t been solved/reduced by regular cleaning efforts.

Lithofin Resin-EX Stripper

Whilst primarily designed for removing resin-based residues, Lithofin Resin-EX Stripper can also be effective in cleaning mouldy grout lines. Its gel-like consistency allows it to cling to vertical surfaces, making it particularly useful for shower walls and other tiled vertical areas where mould tends to grow.

Shop Tile & Grout Cleaners A Guide To Classification Of Adhesives & Grouts

How To Clean Mouldy Grout

We have recently published a full guide on how to clean tile grout, which provides step-by-step instructions on how to remove mould and stains from grout lines. 

1. Choose a professional grout cleaner specifically formulated to tackle tough stains and kill mould spores, such as FILA FUGANET or LTP Grout Stain Remover.

2. Follow manufacturers instructions. Typically you apply the diluted cleaner with an emulsifying pad or grout sponge, leaving it on for the recommended time (usually up to 30 minutes) to allow the specialised ingredients to penetrate the porous surface and break down the mould.
   

3. Thoroughly rinse the surface with clean water and a grout sponge to remove all residues, applying a grout sealer afterwards to protect against future mould growth and make regular maintenance easier.

How To Remove Mould In Grout 

If cleaning isn't working, then it may be time to consider removing the old, mouldy grout and regrout your tiles. This process, while more time-consuming, can provide a long-lasting solution to persistent mould problems. It's particularly useful in cases where the mould has penetrated deep into the grout, making surface cleaning ineffective.

Signs You Need To Replace Tile Grout

Here are some signs that it's time to replace the grout. Grout cleaner can only do so much, and in some cases, replacement is the best option. Recognising these signs early can save you time and prevent more serious issues from developing.

Cracking Grout

Cracked grout can allow moisture to penetrate beneath the tiles, leading to more severe issues. If you notice cracks, it's time to consider replacement. Even small cracks can widen over time, breaking the waterproof seal between tiles and potentially leading to water damage in the underlying structure.

Severe Mould

If mould keeps coming back no matter what you do, it may have penetrated deep into the grout. In this case, removal and replacement is often the best solution. Persistent mould can indicate that the grout has become too porous, allowing water and mould spores to become trapped within. 

Discolouration

If cleaning doesn't restore the grout's original colour, it might be time to consider removing and replacing the grout. Persistent discolouration can be a sign of deep-set stains or mould growth. In some cases, discolouration might also indicate that the grout has degraded and is no longer providing effective protection.

Read More: Guide To Choosing A Grout Colour

Grout Age

If grout is well-looked after, it can last for years! Over time, even well-looked after grout can deteriorate. If your grout is showing more and more signs of wear, it may be time to replace it. The lifespan of grout can vary depending on factors such as the quality of the initial installation, the type of grout used, and the level of wear and tear it experiences.

Grout Removal Tools 

The first step to replacing mouldy grout is to remove it. We stock a wide range of grout removal tools to help you do the job efficiently and effectively. These tools are designed to remove old grout without damaging the surrounding tiles, which is crucial for maintaining the integrity of your tiled surface.

Popular Grout Removal Tools

1. Rubiscraper 250 Grout Removal Tool

   This electric tool is ideal for larger areas and can significantly speed up the grout removal process.

2. Kubala Grout Removing Tool

   A manual option that offers precision and control, perfect for smaller areas or delicate tiles.

3. Vitrex Grout Out - Electric Grout Remover

   Another powered option that combines speed with ease of use, suitable for both DIYer’s and professionals.

How To Remove Old Grout

Removing old grout is relatively simple, but you need to be careful not to damage the tiles. Here's a step-by-step guide to help you through the process:

1. Protect surrounding surfaces with tape or plastic sheeting to prevent damage from debris.

2. Use a grout removal tool to carefully scrape out the old grout. Start at a corner or edge and work your way along the grout lines.

3. Work slowly and steadily to avoid damaging tiles. Pay particular attention to corners and edges where tiles meet.

4. Hoover up debris as you go, keeping the work area clean and to better see your progress.

5. Once all grout is removed, clean the area thoroughly before regrouting. Use a damp cloth to remove any remaining dust or debris.

6. Allow the area to dry completely before proceeding with regrouting.

How To Reapply Tile Grout

Reapplying grout follows the same steps as grouting new tiles. Just ensure that the grout lines are free of debris and completely dry before starting. We have a full step-by-step guide on how to grout tiles, which covers every step of the process, as well as an article on how to grout a patio, so that you can better understand both indoor and outdoor grout applications

Shop Tile Grout Shop Grouting Tools

Mould Resistant Grout

We'd recommend using a tile grout that contains Mould Stop Technology for lasting protection from mould growth. These specialised grouts are formulated to resist mould and mildew, providing long-term protection in damp environments. They often contain antimicrobial agents that inhibit the growth of mould and bacteria, making them ideal for bathrooms and other moisture-prone areas.

Our team is always on hand to help you find the perfect tile grout for the job, feel free to give us a call on 01604 859800.

Preventing Mould On Grout

Once you have replaced the grout, it's important to take extra steps to reduce the risk of mould growth in the future. Prevention is always easier and more cost-effective than dealing with mould problems, again.

Grout Sealers

Grout sealers are excellent at preventing mould by creating a protective barrier that resists moisture and stains. They work by filling the pores in the grout, making it more water-resistant and less hospitable to mould spores. We stock a wide array of tile grout sealers so you can find the perfect one for your needs. 

Shop Tile & Grout Sealers

Popular Tile Grout Sealers

Regular Cleaning

Take an extra 5 minutes after use, especially if tiles are in the shower, to wipe away excess water with a cloth, preventing water from sitting on the grout, or use a squeegee. This simple habit can significantly reduce the likelihood of mould growth. Regular cleaning with specialised grout cleaners can also help maintain grout and prevent mould growth. Aim to clean your grout at least once a week in high-moisture areas.

Read More: What Is The Best Thing To Clean Tiles With?

Ventilation

Ensure the room has plenty of ventilation to reduce humidity. Use extractor fans during and after showers, and keep windows open when possible to allow moisture to escape. This can significantly reduce the likelihood of mould growth on grout. You may even want to start using a dehumidifier to help extract the additional moisture.

By following these steps and maintaining your tiled surfaces regularly, you can keep mould at bay and enjoy clean, fresh-looking grout for years to come. Remember, consistent care and attention are key to preventing mould growth and maintaining the beauty and hygiene of your tiled areas. Should you need any advice or support with your order, don’t hesitate to contact us via email at [email protected] or call 01604 859800.