What Is the Best Waterproofing Solution for Terraces?

Terraces are often among the most enjoyable parts of a home, perfect for morning coffees, relaxing evenings, or hosting gatherings. However, without proper maintenance, these outdoor spaces can face significant problems. Because terraces are exposed to various weather conditions, they need special care and protection.

Waterproofing is crucial to keep your terrace in good condition, preventing issues like leaks, ceiling damage, and stains. In this article, we will explain the importance of waterproofing and which waterproofing is best for terraces to maintain both its functionality and appearance.

What Are the Common Threats to Your Terrace?

Rain and Snowmelt

These are the most common threats as they directly expose your terrace to water. Heavy rainfall or snowmelt can saturate the surface, seep through cracks, and lead to leaks in the underlying structure.

Standing Water

If water puddles or pools on your terrace after rain or snowmelt, it indicates improper drainage. Standing water can put stress on the surface of the terrace and eventually lead to leaks.

Ultraviolet (UV) Rays

While sunshine might seem harmless, prolonged exposure to UV rays can degrade waterproofing membranes over time. This can make them brittle, less flexible, and more prone to cracking, reducing their effectiveness.

Heat

Extreme heat can cause the terrace surface to expand and contract. This repeated movement can put stress on the terrace and lead to cracks or separations at the seams.

Signs That You Need to Consider Terrace Waterproofing

Water Leaks

The most obvious sign is water leaking into your home from the terrace. This can manifest as damp patches on ceilings or walls below the terrace, especially after heavy rain or periods of snowmelt.

Cracks and Gaps

Cracks in the terrace surface, particularly along the edges or around penetrations like drains, can allow water to seep through. Over time, these cracks can widen and worsen the leaks.

Pooling Water

If water puddles or forms stagnant pools on your terrace after rain, it is a sign that the drainage system is clogged or the surface is not sloped properly to direct water away from the building. This can lead to water seeping into cracks and damaging the underlying structure.

Peeling Paint or Plaster

Moisture seeping through the terrace can cause the paint or plaster on the ceiling or walls below to peel, crack, and flake. This is not only aesthetically unpleasing but also indicates potential water damage beneath the surface.

Efflorescence

A white, powdery substance appearing on the terrace surface or walls underneath could be efflorescence. This is caused by water carrying dissolved salts to the surface, which crystallize and leave a white deposit as the water evaporates. It is a sign of moisture issues within the structure.

Musty Odours

A persistent musty odour in your home, particularly near the terrace, can indicate mould or mildew growth. Mould thrives in damp environments, and a leaky terrace can create the perfect breeding ground.

Which Waterproofing is Best for Terraces?

Choosing the right waterproofing solution for your terrace depends on several factors like slope, surface condition, budget, and complexity of the shape. Here is an overview of common options:

1. Liquid-Applied Waterproofing Membranes

This popular choice offers ease of application and versatility. It consists of a liquid coating, typically made from:

• Polyurethane (PU): Known for its flexibility and good adhesion, PU is a common resin used in these membranes.
• Acrylic: Similar to PU, acrylic resins offer good waterproofing properties but might be slightly less flexible.

Here are some pros of liquid waterproofing membranes:

• Easy to apply, even for DIY enthusiasts with proper instructions.
• Flexibility to accommodate minor cracks and structural movement.
• Conforms well to various shapes and details on the terrace.
• Available in a variety of colours for aesthetics (though waterproofing remains the primary function).

2. Sheet Membranes

This option uses prefabricated sheets of high-density polyethylene (HDPE) or polyvinyl chloride (PVC).

• The sheets are rolled out on the terrace surface.
• Seams are overlapped and then heat-welded or glued together to form a watertight seal.

However, look out for these common issues regarding sheet membranes:

• Joints are vulnerable and tend to open up.
• It is not possible to envelope irregularly shaped terraces with corners and penetrations like drains and these end up being points of failure.
• They tend to debond from the roof surface.

3. Acrylic Cementitious Waterproofing Coatings

This traditional and budget-friendly method involves applying an acrylic cementitious coating directly to the terrace RCC surface.

• The cementitious mix typically consists of an acrylic polymer mixed with Portland cement and waterproofing additives in a strictly recommended ratio.
• When applied, it forms a hard, yet somewhat flexible, barrier that bonds well with concrete and masonry substrates.

Here is why cementitious waterproofing coatings are functional:

• Excellent waterproofing at affordable prices and readily available option
• Offers good durability and weather resistance
• Can be applied directly over existing sound concrete or masonry surfaces

4. Epoxy Waterproofing

Epoxy waterproofing is a high-performance solution known for its exceptional durability and resistance to chemical and environmental stress. Epoxy coatings create a seamless, impermeable barrier on the terrace surface, making them ideal for areas exposed to heavy rainfall, standing water, or chemical exposure. This method also provides excellent adhesion and ensures long-term protection against leaks, cracks, and water damage.

Seek Professional Help to Know Which Waterproofing is Best for Terraces

When it comes to waterproofing, the expertise of a qualified professional for proper assessment and installation is necessary. Sunanda Global is the best waterproofing company to ensure that your terrace remains protected. With its market-driven R&D, Sunanda Global has established itself as a leader in the construction chemicals industry. Along with terrace waterproofing, Sunanda is involved in the kitchen, basement, and bathroom waterproofing, etc. 

The following are some products we use in terrace waterproofing:

Polyalk WP: Acrylic Cementitious Waterproofing Coating

POLYALK WP is a high-performance waterproofing solution designed to protect terraces from water damage and environmental stress. Here are its key benefits:

• Exceptional Waterproofing Barrier: Creates a durable, impermeable layer using a polymer-based formula compatible with cement.
• Effective in Moist Conditions: Ideal for regions with heavy rainfall, ensuring reliable protection.
• Enhances Concrete Durability: Prevents carbonation, reducing the risk of structural damage over time.
• Protects Against Cracking and Peeling: Offers high flexural strength and excellent adhesion for long-lasting results.
• Defends Against Sulphate Attacks: Shields terraces from chemical damage, prolonging structural lifespan.
• Maintains Aesthetic Appeal: Keeps surfaces looking great while preventing water damage.

SUNKOTE WP+: UV Resistant, Acrylic Waterproof Coating

SUNKOTE WP+ is a versatile and effective waterproofing coating designed for long-lasting protection. Here’s what makes it stand out:

• Easy Application: Can be applied directly to various surfaces with a brush, roller, or spray.
• Advanced Formula: Single-component, water-based, fibre-reinforced acrylic for a durable, thick membrane.
• Crack Bridging: Adapts to thermal changes and bridges cracks up to 2mm.
• UV and Anti-Fungal Resistance: Designed to withstand harsh environmental conditions.
• Reliable Water Protection: Effectively resists water penetration for enduring performance.

SUNPROOF PU 1K: Polyurethane Waterproofing and Sealing Membrane

SUNPROOF PU 1K is a reliable polyurethane waterproofing solution, designed for versatility and long-term performance. Key features include:

• High Flexibility: Adapts to surface movements for seamless protection.
• Chemical Resistance: Offers robust defence against harsh chemicals.
• Durable, Rubber-Like Coating: Forms a tough, moisture-cured layer for lasting waterproofing.
• Easy Application: Single-component system simplifies use, saving time and labour costs.
• Strong Adherence: Bonds well to concrete and other surfaces for consistent coverage.
• Temperature Resilience: Maintains performance across extreme temperature changes

Contact Sunanda Global today to get in touch with waterproofing contractors in Noida, Delhi, Bengaluru, Mumbai, and other major Indian cities. Know which waterproofing is best for terraces and secure your home!