Waterproofing Membrane Types: Which One Is Right for Your Singapore Property?

TL;DR:

• Learn the two main waterproofing membrane types: sheet-based and liquid-applied

• Understand where each membrane works best (bathrooms, balconies, basements, etc.)

• Compare pros and cons of each system

• Get local insights on which method suits Singapore properties

• Find out how Hydro-seal ensures long-lasting waterproofing

  
  

Introduction: Why Waterproofing Membranes Matter in Singapore

In a tropical country like Singapore, where heavy downpours and high humidity are the norm, waterproofing isn’t just a building luxury—it’s a necessity. From condo balconies to industrial roofs, leaks can cause expensive damage, health risks due to mould, and endless frustration.

A high-quality waterproofing membrane is the first line of defence. But not all membranes are created equal. Should you go with a sheet-based system or a liquid-applied one? Which works best for your rooftop, bathroom, or carpark deck?

This guide breaks down the main types of waterproofing membranes available in Singapore, their pros and cons, and how to choose the right one.

Table of Contents

• Where Are Waterproofing Membranes Used?

• Sheet-Based Membranes

• Torch-On Membranes

• Liquid-Applied Membranes

• Pros and Cons: Sheet vs. Liquid

• How Hydro-seal Can Help

• FAQs

  
  

Where Are Waterproofing Membranes Used?

In Singapore, waterproofing membranes are commonly applied to:

• Toilets and bathrooms

• Rooftops and balconies (especially in high-rise condos)

• Decks and planter boxes

• Basements and retaining walls

• Swimming pools and water features

• Large commercial and industrial roofs
  

Each area has different exposure levels and structural movement, which makes membrane choice critical.

Sheet-Based Membranes

Sheet membranes come in pre-formed rolls and are unrolled onto a prepared surface. They are often bonded using adhesives or a torch-on method. Popular types include bituminous membranes, valued for their strength and weather resistance.

Common Applications in Singapore:

• Flat concrete roofs

• Industrial rooftops

• Large outdoor surfaces

Benefits of Bituminous Sheet Membranes:

• Uniform thickness and consistent quality

• Low odour and relatively easy to maintain

• Long-lasting with proper installation

• Flexible and can handle structural movement

Drawbacks:

• Labour-intensive installation

• Requires careful handling of seams and edges

• May need to be cut and tailored to fit complex surfaces

  
  

Torch-On Membranes

Torch-on membranes are a subtype of bituminous sheets applied using a gas torch. The heat melts the membrane onto the substrate, forming a strong bond.

Commonly Used For:

• Exposed rooftops (HDBs, condos, factories)

• Flat roofs prone to ponding water

Advantages:

• Excellent UV and moisture resistance

• More eco-friendly than older bitumen methods

• Quiet installation

• Suitable for Singapore's hot, wet climate

Materials Used:

• APP (Atactic Polypropylene)

• SBS (Styrene Butadiene Styrene)

  
  

Liquid-Applied Membranes

Liquid membranes are applied using a brush, roller, or sprayer. Once cured, they form a seamless, joint-free waterproof layer.

Ideal For:

• Uneven surfaces with corners and penetrations

• Vertical walls and planter boxes

• Older roofs where aesthetics matter

Advantages:

• Seamless application avoids weak spots

• Flexible and adapts to unusual shapes

• Easy to apply on both vertical and horizontal surfaces

• Good chemical and UV resistance

Drawbacks:

• Requires skilled surface preparation to avoid air bubbles

• Drying time may extend project duration

  
  

Hydro-seal Engineering Technician Applying Liquid-applied Membrane

Pros and Cons: Sheet vs. Liquid

Feature	Sheet-Based Membranes	Liquid-Applied Membranes
Seam Handling	Requires overlap welding	Seamless
Surface Compatibility	Flat surfaces best	Complex/uneven surfaces
Application Time	Faster drying	Slower due to curing
Aesthetic Finish	Industrial look	Cleaner, uniform finish
Typical Use	Large roofs, decks	Bathrooms, planters, balconies

How Hydro-seal Can Help

Since 1995, Hydro-seal Engineering has helped homeowners, MCSTs and facility managers across Singapore prevent leaks before they escalate. Whether your project needs a torch-on membrane for rooftop protection or a liquid membrane for a planter box, we offer expert diagnostics and professional installation.

📞 Call us at 6289 6811 for a free site inspection and membrane recommendation.

🔗 Learn more: Our Waterproofing Services

FAQs

What is the best waterproofing membrane for bathrooms in Singapore? Liquid-applied membranes are often best due to their seamless application and ability to cover corners and pipe penetrations.

How long does a waterproofing membrane last? With proper installation and maintenance, membranes can last 10–20 years or more.

Do I need BCA approval for waterproofing works? For major renovations or structural works, yes. For maintenance waterproofing, typically no—but always check with your contractor or MCST.

Can I apply waterproofing myself? DIY is possible for small areas, but professional installation ensures longevity and compliance with local standards.

Conclusion: Choose the Right Membrane, Prevent Long-Term Damage

Not all leaks are created equal, and neither are waterproofing membranes. Choosing the right membrane type can prevent costly repairs, maintain property value, and ensure safety.

Whether you're a homeowner dealing with a balcony leak or a facility manager planning a rooftop upgrade, Hydro-seal can guide you every step of the way.

📞 Call 6289 6811 to schedule your free waterproofing diagnosis today.