Ultimate Guide for Balcony Tile Waterproofing

Written By Adam Paul - Waterproofing Expert

Balcony tile waterproofing is the process of installing a waterproof layer on the balcony surface before tiling it. The waterproofing layer prevents leaks, structural damage, mold growth, and tile deterioration caused by moisture exposure over time. 

Tiles are not 100% waterproof. It can seep the water when it is saturated from the water. When a balcony gets wet over time, water can seep through the tile layer. Then it spread and dampened the walls, floor, and ceiling. In order to prevent this Aqviz highly recommends you waterproof the balcony before tiling it.

Why You Should Waterproof Balcony Tiles?

Tile is used as a balcony flooring. You should waterproof balcony tiles to prevent water damage, enhance safety, extend tile lifespan, and protect against extreme weather conditions.

1. Prevents water damage: Balcony tiles should be waterproof to prevent cracks, mold growth, and weakening of the balcony structure.
2. Enhances safety: The balcony waterproofing system helps to maintain a dry and safe walking surface on the balcony floor.
3. Extends tile lifespan: Balcony waterproofing protects tiles and grout from long-term damage. over time. 
4. Protects extreme weather conditions: Rain, snow, and humidity can deteriorate balcony surfaces. A waterproofing layer shields against extreme weather conditions such as rain, snow, and higher humidity conditions.

At Aqviz, we always recommend a reliable waterproofing system under and over balcony tiles to ensure durability, safety, and long-term performance.

What Tiles Can Be Used for Balconies?

Tiles are one of the most used building materials. Choosing the right tiles for a balcony is crucial for durability and safety. Not all tiles are suitable for outdoor conditions. The best balcony tiles should be water-resistant, slip-resistant, durable, and able to withstand weather changes. So here is our list of tiles for balconies.

1. Porcelain tiles: Porcelain tiles are highly water-resistant, durable, and available in slip-resistant textures but they are not waterproof. Hence it requires floor sealing to prevent water damage.
2. Ceramic tiles: Ceramic tiles are more affordable than porcelain but slightly less durable. You can use them for balconies with suitable sealing methods.
3. Natural stones: Natural stones like granite, slate, and travertine are strong and stylish for the balcony but they are not waterproof. Hence it requires floor sealing to prevent water damage
4. Terracotta tiles: Terracotta tiles provide a rustic look and good durability, but they are not waterproof. So it needs proper sealing to prevent water absorption to the balcony floor.

For balcony waterproofing, porcelain, and natural stone tiles are the best options. They resist water penetration, provide a strong surface, and reduce the risk of slipping when wet. 

They are not waterproof so you should seal the floor properly and combine them with a reliable waterproofing membrane for long-lasting protection.

What Is the Best Waterproofing Under Balcony Tiles?

The best waterproofing under balcony tiles are cementitious waterproofing, polyurethane waterproofing, bituminous waterproofing, and PVC waterproofing. These membranes are durable, water-resistant, and able to withstand outdoor conditions. 

1. Cementitious waterproofing: Cementitious membranes are easy to apply, bond well to concrete, and provide a strong waterproof layer under the balcony tiles. 
2. Polyurethane liquid membrane: Polyurethane liquid membranes are flexible and seamless. It prevents water seepage and adapts to balcony movements caused by temperature changes. It is highly effective for long-term waterproofing.
3. Bituminous membrane: Bituminous membrane is an asphalt-based membrane. It provides excellent water resistance and durability. It works well for balconies with high moisture exposure.
4. PVC waterproofing membrane: PVC membranes are strong, flexible, and UV-resistant. They provide a long-lasting waterproof barrier under balcony tiles.

So we recommend using polyurethane or cementitious waterproofing under balcony tiles for superior protection against water damage and weather conditions. You can choose another waterproofing membrane by referring to our 6 Types of Waterproof Balcony Waterproofing Membranes with Essential Features guide.

How to Waterproof Balcony Tiles?

Follow these seven simple steps to waterproof balcony tiles effectively:

1. Inspect the balcony surface: Check for cracks, loose tiles, or any signs of damage under the balcony floor. You should repair them before waterproofing.
2. Clean the surface: Remove dust, dirt, and grease using a brush and detergent. Ensure the surface is completely dry before applying the waterproofing layer.
3. Apply a waterproofing primer: Apply a primer before installing the waterproofing layer. It improves adhesion and ensures the waterproofing membrane bonds well with the surface.
4. Apply the waterproofing membrane: Use a cementitious, polyurethane, or PVC waterproof membrane. You can install it using the recommended method.
5. Allow proper curing time: Let the waterproof membrane cure for 24 to 48 hours before proceeding with tile installation.
6. Install the tiles with waterproof adhesive: After the curing process, use a high-quality waterproof tile adhesive and grout to prevent water seepage.
7. Seal the grout lines and joints:  Apply a waterproof sealant over the grout lines to protect against moisture infiltration to the balcony floor.

Aqviz experts have prepared a complete guide “How to waterproof a balcony”. It helps to waterproof and check its progress from start to end. So we recommend to refer to that before starting your project.

How Long Does Balcony Tile Waterproofing Last?

Balcony tile waterproofing can last 10 to 20 years. But it depends on the waterproofing method, material quality, and maintenance. Regular inspections and re-sealing help extend its lifespan.

Can You Waterproof Without Removing Balcony Tiles?

Yes, you can waterproof without removing balcony tiles if there are no major cracks or tile damage. Use a clear waterproofing sealer or liquid-applied membrane over the existing tiles to prevent water seepage. However, for severe leaks or loose tiles, removing and reapplying waterproofing is the best option.

Can I Use Grout Sealer as Waterproofing?

No, the grout sealer only protects grout lines from moisture and stains but does not provide full waterproofing capability. For proper waterproofing, use a liquid membrane or waterproofing system under the tiles.

Can I Waterproof the Existing Balcony Tiles?

Yes, you can waterproof over existing balcony tiles using a liquid-applied membrane, epoxy coating, or clear waterproof sealer. However, the surface must be clean, dry, and in good condition for effective results.