Tiles are a popular choice for floors, walls, and even countertops in modern homes because they’re durable, stylish, and easy to clean. But tiles alone aren’t naturally waterproof—especially the grout in between them. Over time, moisture can seep through tiny cracks and gaps, leading to mold, mildew, and water damage beneath the surface. This is especially true in wet areas like bathrooms, kitchens, and balconies.

The good news is that you can protect your tiled areas without hiring a contractor. With a few smart techniques and the right products, you can make your tiles water-resistant and extend their life. Whether you’re dealing with a brand-new installation or an older surface that needs sealing, these tips will help you get the job done with confidence.

In this guide, we’ll cover 10 simple and effective ways to waterproof your tiles with a tile chemical at home, so you can keep moisture out and peace of mind in.

1. Start with a Waterproof Membrane 

Before laying tiles in wet areas like bathrooms or kitchens, apply a waterproof membrane over the substrate. These membranes act as a protective barrier, stopping water from penetrating beneath the tiles. They come in liquid form (paint-on) or sheet form. Apply it evenly on the wall or floor before tiling, and make sure it’s completely dry before continuing. This step is critical for long-term waterproofing.

2. Seal the Grout Properly 

Grout is porous and can absorb water, which leads to mold and mildew over time. After your tiles are installed, apply a grout sealer. Use a brush or applicator tool and follow the manufacturer’s instructions. Sealing grout prevents water from seeping into the joints between tiles. Reapply every 6 to 12 months to maintain protection, especially in high-moisture areas.

3. Use Waterproof Grout 

Instead of traditional grout, opt for epoxy-based or waterproof grout. These grouts are resistant to moisture and stains, making them ideal for showers, pool areas, or outdoor tile installations. They’re also more durable and easier to clean. Though they cost more and are slightly harder to apply, they provide excellent long-term protection.

4. Install Tile Backer Boards 

When working on tiled walls in wet spaces, avoid using regular drywall or wood. Instead, install cement-based tile backer boards. These are moisture-resistant and offer a strong base for tiling. They won’t warp or deteriorate when exposed to water, unlike wood-based panels. This foundation step is key for waterproofing from the inside out.

5. Apply a Waterproof Coating Over the Surface 

For existing tiled areas, a liquid waterproofing sealer or tile coating can be brushed or sprayed over the entire surface. These products form an invisible layer that repels water, dust, and stains. It’s an easy DIY solution for maintaining waterproof tiles, especially in older installations or rental spaces.

6. Check for and Repair Cracked Grout or Tiles 

Water often enters through cracks in grout lines or broken tiles. Regularly inspect your tiles for any visible damage. If you spot hairline cracks or chipped areas, repair them immediately with fresh grout or a tiles adhesive. For broken tiles, replace them completely. Even the smallest cracks can let water in and cause major issues over time.

7. Ensure Proper Slope for Drainage 

For floors in bathrooms or balconies, the slope matters. Water should naturally flow toward the drain. If it pools in certain areas, it increases the chance of seepage. If you’re redoing the tiling, make sure the slope is correct. For existing floors, consult a professional if pooling becomes a problem—it may need regrading or adjustment.

8. Use Silicone Sealant Around Edges and Fixtures 

Tiles often meet bathtubs, sinks, countertops, or walls. These joints are common leak zones. Fill them with waterproof silicone sealant rather than grout. Silicone is flexible and creates a watertight seal that moves with temperature changes. Reapply it every year or when you see signs of peeling or cracking to keep moisture out.

9. Ventilate Moisture-Prone Areas 

Even the best waterproofing won’t help if moisture builds up constantly. Ensure that bathrooms and kitchens have proper ventilation, either with an exhaust fan or a window. Good airflow helps tiles and grout dry faster, reducing the risk of long-term water damage. Consider using a dehumidifier in damp environments to further protect tilework.

10. Perform Routine Cleaning and Maintenance 

Waterproofing your tiles is not a one-time solution—it requires ongoing care and maintenance. Over time, daily exposure to water, soap scum, dirt, and mold can wear down even the best waterproofing layers. Sealants and grout lines are particularly vulnerable, and once compromised, moisture can begin to seep through, causing long-term damage to the underlying structure.

To maintain the effectiveness of your waterproofing, clean your tiles regularly using mild, non-abrasive cleaners. These are gentle enough to clean without stripping away the protective sealant layer. Avoid harsh chemicals like bleach or acid-based cleaners, as they can degrade both grout and sealants, making your tiles more susceptible to water penetration.

After cleaning, always dry the tiles with a clean cloth or towel to prevent standing water from settling in joints and corners. Additionally, it’s important to inspect your tiled areas every few months. Look for cracks, discoloration, or peeling sealant—these are early warning signs of moisture intrusion. If necessary, reseal grout lines or apply a fresh layer of waterproof coating to keep your tiles fully protected. Regular upkeep not only extends the life of your tiles but also helps avoid costly repairs down the line.

Waterproofing your tiles isn’t just about appearance—it’s about protecting the structure underneath and avoiding costly repairs in the future. With a proactive approach and the right tools like gypsum plaster, you can keep moisture from seeping into your home’s surfaces. Whether you’re tiling a new space or maintaining an existing one, applying these 10 simple strategies ensures that your tiles remain strong, stylish, and safe for years to come.

Remember, even small steps like sealing grout or using silicone around fixtures can make a big difference. Start with one or two of these tips today, and you’ll be well on your way to a dryer, cleaner, and more durable tiled space.