Why Do Balconies Leak?

Balcony leaks are widespread, particularly in multi-story residential and commercial buildings. According to research from major insurance providers, balconies and terraces are prone to waterproofing failures, making them a frequent cause of water damage claims. 

Unfortunately, the reasons for balcony leaks are often overlooked during the design and construction phases, which can lead to severe consequences for homeowners and builders alike. If not adequately inspected and addressed, balcony leaks can significantly reduce the value of your property and lead to more severe problems down the line. 

In this blog, we’ll explore why balconies leak, the common causes, and how to prevent this issue from damaging your home.

Let’s get straight to the point.

Balcony leaks are a common problem, particularly in multi-story buildings, due to poor waterproofing and drainage issues. Causes include poor construction planning, rainwater accumulation, structural movement, and inadequate drainage systems. 

Key signs of leaks include cracks, discolouration, mould, and standing water.  It’s essential to ensure proper installation of high-quality waterproofing membranes, regular inspections, and maintenance to prevent leaks. 

Installing effective drainage systems and selecting membranes suitable for harsh weather conditions can help avoid costly damage and health risks associated with mould and dampness.

Common Causes Of Balcony Leaks

1. Poor Planning And Construction

One of the leading causes of balcony leaks is poor planning during the construction phase. Many contractors must install the waterproofing membrane correctly or may use low-quality materials that do not meet building standards. 

This is a critical mistake, as the waterproofing membrane is the first defence against water ingress. Builders must follow building codes and best practices throughout the entire construction process. 

Neglecting any step can result in water pooling on the balcony surface, causing long-term damage. To prevent this, it’s essential to ensure the following during the construction phase:

• Proper installation of the waterproofing membrane
• Use of high-quality materials suitable for different climate
• Adequate supervision of the entire construction process

2. Rainwater Accumulation

Rainwater accumulation on the surface of a balcony is another common cause of leaks. When water is not properly drained, it can lead to membrane deterioration over time. 

This issue is particularly common in multi-storey buildings where balconies often have a shallow or no slope. Rainwater has no place to go without the right drainage gradient, and it stays on the balcony’s surface. 

Over time, the continuous exposure to water causes the waterproofing membrane to break down, leading to leaks. This problem can be avoided by ensuring that the balcony is designed with the following in mind:

• A proper slope or gradient to direct water away
• Sufficient drainage outlets to allow water to escape
• Regular maintenance to keep drainage systems clear

3. Structural Movement

Every building experiences natural movement over time due to environmental factors like temperature changes, soil settling, and other external forces. While this movement is normal, it can cause problems if not considered during a balcony’s construction and maintenance.

Structural movement can lead to cracks in the balcony surface or the waterproofing membrane, allowing water to seep. These cracks may be small at first, but over time, they can expand and become a serious issue. 

Regular inspections are crucial to identify early signs of cracking or structural issues before they lead to leaks. Key areas to monitor include:

• Cracks in grout or tiles
• Movement in the balcony joints
• Signs of water penetration on lower floors

4. Lack Of Proper Drainage

One of the most significant contributors to balcony leaks is the need for proper drainage. When no effective drainage system is in place, water has nowhere to go and begins to pool on the surface. 

This standing water can gradually find its way into even the smallest cracks, weakening the structure and causing leaks over time. Ensuring that your balcony has an effective drainage system is essential for preventing leaks. This includes:

• Installing drainage outlets that direct water away from the building
• Keeping drainage systems clear of debris and blockages
• Regularly inspecting drainage systems to ensure they are working correctly

Signs Of A Leaky Balcony

Detecting a leak early can save you from expensive repairs down the line. Below are some of the common warning signs that indicate your balcony may be leaking:

Visible Cracks Or Tile Damage

One of the most apparent signs of a leak is cracks in the tiles or grout. These cracks allow water to penetrate the surface, leading to more extensive damage over time. 

Loose or damaged tiles are also a clear indication of underlying water issues.

Discolouration And Stains

If you notice discolouration or stains on the ceiling below your balcony, this is a strong sign that water is leaking through. Water stains are often the result of a long-term leak, so it’s essential to address the issue as soon as possible.

Mould And Mildew Growth

Mould and mildew thrive in damp environments. If you see signs of mould on your balcony or the walls near it, there is likely a water problem. 

Mould indicates a leak and can pose serious health risks to occupants, particularly those with allergies or respiratory issues.

Ponding Water

If water remains on your balcony after rainfall, it indicates a drainage problem. Ponding water leads to membrane deterioration and increases the likelihood of leaks.

How To Prevent Balcony Leaks?

Proper Installation And Planning

The best way to prevent balcony leaks is to install the waterproofing membrane correctly. This means using high-quality materials that comply with current building standards and ensuring that experienced professionals carry out the installation process. 

Builders should avoid cutting corners, as improper waterproofing can lead to costly repairs and potential legal issues.

Regular Maintenance And Inspections

Regular maintenance is crucial to catching problems early. This includes checking for cracks in the grout, loose tiles, and any signs of water damage. 

Balcony membranes have a lifespan; over time, they may need to be replaced to continue providing protection. Property owners should schedule annual inspections to identify potential issues before they become significant problems. 

Early detection and repair can save homeowners from the high cost of a complete waterproofing system overhaul.

Drainage Systems

Installing an effective drainage system is essential for preventing water from pooling on your balcony. The system should include outlets for water to drain away from the building and be positioned to ensure all surface water is directed off the balcony. 

Regularly clearing drainage systems of debris will ensure they function optimally and help prevent leaks.

Waterproofing Membranes

When selecting a waterproofing membrane, choose one designed for your balcony’s specific conditions. Different climate, particularly harsh sun and heavy rainfall, can cause some membranes to degrade faster. 

Look for membranes that offer long-term protection against both moisture and UV exposure.

Conclusion

Balcony leaks are common in residential and commercial buildings, but they are preventable with the right approach. The most common causes of leaks are poor planning, rainwater accumulation, structural movement, and a lack of proper drainage. 

Addressing these issues during construction and maintaining your balcony over time can help prevent costly water damage. By ensuring proper installation of waterproofing membranes, regular inspections, and effective drainage systems, you can protect your property from balcony leaks. 

If you suspect your balcony is leaking, it’s important to take action quickly to prevent further damage and the potential health risks associated with mould and damp environments.

FAQs About Balcony Repair

How Many Coats of Waterproof Does a Balcony Need?

Make sure that all of the wall and floor joints, nail and screw heads, and flanges are sealed with joint sealant (ensuring penetration flanges are installed correctly). To ensure that the balcony is completely watertight, apply two coats of a polyurethane membrane.

How Do I Know if My Balcony Is Leaking?

The presence of cracked or missing grout is one of the most typical warning signs that a balcony is leaking. In addition to paint that is either flaking or peeling and water stains on the underside of the balcony. In some situations, you might find that water is dripping down the walls or coming through the ceiling.

What Is Balcony Membrane?

A deck membrane, also known as a balcony membrane, is a watertight layer that can be installed on a balcony or deck to protect the underlying structure from water infiltration. It is possible for the membrane to be left uncovered, in which case it would serve as the actual walking surface, or it could be covered with pavers made of precast concrete, wood planking, or a concrete topping.

Should You Seal Balcony Tiles?

You can prevent any kind of water damage to the balcony by sealing it with the appropriate sealer, which will allow you to waterproof it from the surface up. If you waterproof the surface, you will be protecting the structure of the balcony as a whole.

How Long Should a Balcony Last?

Because most decks and balconies are constantly exposed to the elements, the actual expected life span is likely to be between 10 and 15 years. This, of course, is predicated on the assumption that proper maintenance is performed at regular intervals throughout the lifespan of the structure.