Waterproofing your roof is one of the most critical investments you can make to protect your property, especially in Singapore’s tropical climate. Regular rain, high humidity levels, and scorching sun exposure can deteriorate a roof over time. To ensure your roof remains durable and leak-free for years, it’s important to choose the right roof waterproofing methods and trusted materials.

This article is all about the five roof waterproofing types, their advantages and disadvantages, cost-effectiveness, and mistakes to avoid like an enemy. We will also discuss the most trusted materials used by contractors in Singapore and how SP Roofing Contractor stands out from the competition. So, keep reading till the end cause we have some cherry on the top for you!

1. Liquid Waterproofing Membrane Method

This technique involves the application of a liquid coating that cures into a continuous solid waterproof membrane. It’s very versatile and performs excellently on complicated roof designs. Because of the liquid factor, it can reach any corner smoothly leaving a fantastic waterproofed layer.

Common Liquid Waterproofing Brands Used in Singapore

• SikaTop® Seal-107: Highly effective polymer-modified cementitious waterproofing two-component liquid membranes
• Mapei Mapelastic: Flexible and strongly resistant to cracks.
• Dr. Fixit Flexicoat: This is a trusted product for liquid waterproofing which provides UV blockage and long-lasting performance.

Advantages

• Highly flexible and adjusts to temperature changes without breaking.
• These are suitable for roofs with complex layouts, such as skylights or shaped surfaces.

Disadvantages

• Requires skilled application to ensure durability.
• Higher upfront cost compared to simpler methods.

Cost: $7–$12 per square foot

Best for irregularly shaped residential and commercial roofs.

SP Roofing’s Expertise:

We use the highest quality polymer-based liquid membranes which are both UV and weather resistant. We apply it professionally for a perfect finish and longevity.

2. Bituminous Waterproofing Method

A time-tested technique, bituminous waterproofing utilizes asphalt-based materials that are applied as a sheet or a liquid. It is a common option, especially for flatter roofs.

Common Bituminous Waterproofing Brands in Singapore

• Shell Bitumen®: Known for its high-quality asphalt with superior adhesion and durability.
• Bitustick®: A self-adhesive, bituminous membrane ideal for quick and effective waterproofing.
• Sika® Bituminous Seal: Provides excellent water resistance and longevity.

Advantages

• Provides long-lasting, excellent water penetration resistance.
• Great for large-scale projects at a low price

Disadvantages

• Limited flexibility; may crack under extreme temperature changes.
• Not the most eco-friendly option.

Cost: $5–$8 per square foot

 It’s best for flat roofs, industrial buildings, and large-scale projects.

SP Roofing’s Expertise:

Our bituminous waterproofing solutions are specifically designed to reduce the absorption of heat, the perfect fit for Singapore’s hot, humid climate.

3. Polyurethane Waterproofing Method

This high-tech option uses liquid polyurethane to create an elastic, seamless barrier. It works particularly well for roofs that have an exposed surface.

Common Polyurethane Waterproofing Brands in Singapore

• BASF MasterSeal: A seamless, high-performance polyurethane waterproofing membrane known for its outstanding elasticity and durability.
• SikaProof® PU: The best of both worlds — durability and extreme weather resistance.
• Dr. Fixit PU Membrane: Provides seamless waterproofing and UV resistance.

Advantages

• UV-resistant, perfect for roofs exposed to sunlight.
• Highly elastic, preventing cracks even under extreme conditions.

Disadvantages

• Moisture sensitive while application.
• Need professional guidance for best the outcome.

Cost: $10–$15 per square foot

Ideal For: Roof terraces and balconies.

SP Roofing’s Expertise:

We use advanced polyurethane systems tailored to Singapore’s climate, ensuring a long-lasting, seamless finish. Our specialists are trained to handle this delicate application process with precision.

4. PVC or EPDM Membranes Waterprofing Method

Synthetic waterproofing membranes, such as PVC or EPDM, are pre-fabricated sheets that are installed over the roof surface. They’re some of the most durable options out there.

Common PVC or EPDM Waterproofing Brands in Singapore

• Firestone EPDM Roofing Membrane: Known for its durability and resistance to extreme weather conditions.
• Sarnafil® PVC Membranes: Provides superior UV resistance and elasticity.
• Carlisle SynTec EPDM Membrane: A common choice for its durability and waterproofing features.

Advantages

• Outstanding resistance to weather and UV damage.
• Durability (life span up to 30 years with care).

Disadvantages

• Expensive installation costs.
• Requires expert handling to prevent leaks at seams.

Cost: $12–$20 per square foot

Best for commercial roofs over 20,000 square feet, or residential roofs in very high exposure areas.

SP Roofing’s Expertise:

These membranes are then installed and tailored by our team for a perfect fit with no weak installation points!

5. Cementitious Waterproofing Method

This method employs a cement-based solution to form a waterproof barrier. It’s easy and cheap, but not super on exposed parts.

Common Cementitious Waterproofing Brands in Singapore

• SikaTop® Seal-107: An extremely effective material for cementitious waterproofing, especially on sheltered surfaces.
• Mapei Planiseal: Strong bonding and waterproof function
• Laticrete Hydro Ban: For Cementitious waterproofing with added flexibility.

Advantages:

• Also easy to use and very low cost.
• Ideal for unexposed areas such as basements or partially shaded roofs.

Disadvantages:

• As it ages it hardens and becomes increasingly brittle, especially in cases of temperature changes.
• Not very effective for exposed roofs.

Cost: $3–$6 per square foot

Best Use: Indoors or partially covered.

SP Roofing’s Expertise:

Cementitious waterproofing is further optimized with additives to ensure better reliability and durability, making it the best choice for cost-effective means of high exposure.

Mistakes to Avoid in Roof Waterproofing

1. DIY Blunders

• Using inferior materials that are not idle for Singapore’s weather.
• Not taking the proper steps like surface preparation and priming.
• Applying layers too thinly or not evenly, which can result in areas of weakness.

2. Poor Material Choices

• Choosing cheap, non-durable materials to save costs.
• Neglecting the need for UV or weather resistance.

SP Roofing’s Advantage

• Comprehensive Evaluations: We inspect your roof’s condition and recommend the most suitable method accordingly.
• Only the Best: Only the highest-quality products suitable for the climate are used and also at affordable budget.
• Professional Application: Leaks or early wear can happen with improper application, so our certified technicians apply the paint with perfection.

At The End Point

To extend the life of your roof and protect your home from Singapore’s unpredictable weather, leakage, moulds & mildews, waterproofing is a necessary process. Choosing the right method and materials can make or break your long-term success, whether you’re going for bituminous sheets, the more traditional approach with liquid membranes, or these new high-tech polyurethane solutions.