How to Fix a Leaking Balcony: Causes and Repair Solutions


A leaking balcony can be a homeowner’s worst nightmare. Not only does it compromise the structural integrity of your home, but it also leads to unsightly damage and costly repairs. In this comprehensive guide, we will delve into the reasons behind balcony leaks and provide you with three effective ways to repair them. By the end of this article, you’ll be equipped with the knowledge to address this common issue and restore the safety and aesthetics of your outdoor space.

Understanding the Causes of Balcony Leaks

Before you can effectively repair a leaking balcony, it’s crucial to understand why it’s happening in the first place. Here are some common causes:

1. Poor Construction

One of the primary reasons for balcony leaks is poor construction. When balconies are not built with proper waterproofing measures, water can seep through cracks and crevices, causing leaks over time. This is often the case with older homes or properties that were constructed without modern waterproofing techniques.

2. Cracks and Gaps

Over time, the wear and tear of weather, temperature fluctuations, and foot traffic can lead to cracks and gaps in the balcony’s surface. These small openings may not be immediately noticeable, but they can allow water to penetrate, resulting in leaks.

3. Inadequate Drainage

Inadequate drainage is another common issue that can lead to balcony leaks. When water cannot properly drain away from the balcony, it accumulates, increasing the likelihood of leaks. Blocked or clogged drainage systems can exacerbate this problem.

4. Harsh Weather Conditions

Extreme weather conditions, such as heavy rain, snow, and ice, can put a significant strain on your balcony’s waterproofing. Over time, this can lead to the deterioration of waterproofing materials and, subsequently, balcony leaks.

Repairing a Leaking Balcony: Three Effective Solutions

Now that you understand the potential causes of balcony leaks, let’s explore three proven methods to repair and prevent them:

1. Waterproofing Membrane Installation

a. Inspection and Preparation

The first step in repairing a leaking balcony with a waterproofing membrane is a thorough inspection. Identify any visible cracks, gaps, or damaged areas on the balcony surface. Afterward, clean the surface and remove any loose debris.

b. Apply Waterproofing Membrane

Once the balcony is prepped, apply a high-quality waterproofing membrane. This membrane acts as a protective barrier against moisture infiltration. It should be applied evenly, covering all potential problem areas, such as seams and joints.

c. Sealing and Curing

After the membrane application, it’s essential to allow it to cure properly. Follow the manufacturer’s recommendations for drying and curing times. Once cured, perform a final inspection to ensure there are no missed spots or imperfections.

2. Balcony Resurfacing

a. Surface Preparation

Balcony resurfacing involves removing the existing surface layer and applying a new, durable material. Start by removing any loose or damaged surface materials, such as tiles or concrete.

b. New Surface Application

Apply a fresh layer of suitable balcony surface material, such as concrete or waterproof tiles. Make sure the new surface has proper slope and drainage to prevent water from pooling.

c. Sealing and Finishing Touches

Seal the new surface with a waterproof sealant to provide an extra layer of protection. Additionally, consider adding an aesthetic finish, such as decorative tiles or outdoor flooring, to enhance the balcony’s appearance.

3. Regular Maintenance and Repairs

a. Routine Inspections

Prevention is often the best cure. Regularly inspect your balcony for signs of wear and tear. Look for cracks, gaps, or areas where the waterproofing may have deteriorated. Promptly address any issues you find.

b. Cleaning and Clearing Drainage

Keep your balcony clean and ensure that drainage systems are free of debris. Blocked drains can lead to water accumulation and increased risk of leaks.

c. Professional Help

If you’re unsure about the severity of the balcony leak or the necessary repairs, it’s wise to consult a professional contractor with experience in balcony waterproofing. They can assess the situation and recommend appropriate solutions.


A leaking balcony can cause significant damage to your home and diminish the overall enjoyment of your outdoor space. However, by understanding the causes of balcony leaks and implementing the right repair solutions, you can restore your balcony’s functionality and aesthetics. Whether you choose to install a waterproofing membrane, opt for balcony resurfacing, or prioritize regular maintenance, taking action is essential to safeguard your investment and ensure years of enjoyment from your balcony. Don’t wait until the problem worsens; address balcony leaks promptly and enjoy a dry, secure, and beautiful outdoor space for years to come.