Are Tiles Waterproof? What You Need to Know Before Installing Them

When planning a bathroom, kitchen, or even an outdoor remodel, one of the most common questions we get at F&M Construction & Remodeling is: “Are tiles waterproof?” The short answer is—some are, but proper installation is key to making the entire surface water-resistant or waterproof.

Are Tiles Themselves Waterproof?

The material your tiles are made of determines how well they repel water:

• Porcelain Tiles: These are among the most water-resistant tiles available, with a water absorption rate of less than 0.5%. Their dense structure makes them ideal for wet areas like showers, bathrooms, and outdoor use.
• Ceramic Tiles: Slightly more porous than porcelain, ceramic tiles are still considered water-resistant. They’re perfect for walls, backsplashes, and general flooring, especially when properly glazed.
• Natural Stone Tiles: Materials like marble, travertine, or slate look stunning but are naturally porous. Without sealing, they can absorb moisture, stain easily, and become damaged over time. Regular sealing is a must.

What About the Entire Tiled Surface?

Even if your tiles are waterproof, the full surface isn’t necessarily water-tight unless properly installed. That’s because:

• Grout lines between tiles are not waterproof. Grout can absorb water and become a pathway for leaks, especially in areas with frequent exposure to moisture.
• Without a waterproof membrane beneath, water can seep through grout lines, cracks, or tile edges and damage the subfloor or wall structure beneath.

How to Make a Tiled Area Truly Waterproof

To ensure a long-lasting, waterproof installation, we recommend:

1. Using waterproof or low-absorption tile like porcelain in wet areas.
2. Installing a waterproof membrane (like RedGard or Schluter Kerdi) under the tile surface in bathrooms, showers, and wet rooms.
3. Sealing grout lines regularly to prevent moisture intrusion.
4. Hiring experienced contractors who follow proper tile installation and waterproofing protocols.

Final Thoughts

Tiles can absolutely be a waterproof and durable choice for your remodel—but only when combined with the right materials and installation techniques. At F&M Construction & Remodeling, we specialize in high-quality tile installations that are built to last, no matter the room.