Choosing the right waterproofing system for your flat roof is crucial. Here’s an honest comparison of torch-on and liquid waterproofing to help you decide which is best for your property
Torch-On vs Liquid Waterproofing: Which Is Better?
When choosing the right waterproofing system for your roof, it helps to understand the differences between torch-on waterproofing and liquid applied waterproofing. Both methods create protective barriers, but they work in different ways and suit different applications, especially under South African weather conditions.
What Is Torch-On Waterproofing?
Torch-on waterproofing uses modified bitumen sheets that are heated with a gas torch to fuse them securely to the roof surface. This process forms a tough, uniform layer that is highly durable and resistant to UV, temperature changes, and regular wear. It’s especially suited for large flat roofs and areas where long-term protection is needed.
Key Features:
- Excellent puncture resistance and UV stability
- Long lifespan when installed professionally
- Best for large, uncomplicated roof surfaces
What Is Liquid Waterproofing?
Liquid waterproofing involves applying a specialised coating, such as acrylic or rubber-based membranes, directly onto the roof surface in liquid form. Once cured, it creates a seamless, flexible waterproof layer that adapts easily to roof details and penetrations.
Key Features:
- Seamless, joint-free membrane that reduces weak points
- Excellent flexibility for complex roof details
- Applied without an open flame — safer and often faster to install
Key Differences & Benefits
Here’s how the two systems compare on common considerations:
- Durability: Torch-on membranes often offer a longer service life due to thicker material and consistent layering, making them ideal for flat roofs and commercial applications.
- Flexibility: Liquid systems remain highly elastic after curing, which helps them handle building movement and irregular surfaces better than sheet membranes.
- Seamlessness: Liquid waterproofing creates a single, jointless membrane that eliminates potential weak points where water can penetrate.
- Safety: Liquid systems are applied cold (no torch), reducing fire risk during installation.
- Application Complexity: Torch-on requires specialist skills and careful heat control, while liquid membranes can often be rolled, brushed, or sprayed by trained technicians.
Which Is Best for Your Property?
- Choose torch-on waterproofing if you have a large flat roof with minimal penetrations and want a highly durable, long-lasting membrane.
- Choose liquid waterproofing when your roof has complex details, many penetrations, or you prioritise a fully seamless membrane.
Both systems can provide excellent protection when installed correctly — a professional assessment ensures you choose the right method for your specific roof and location.
Need Expert Advice?
Get a free assessment from our waterproofing specialists. We’ll help you choose the right solution for your roof.
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Whether you need repairs, maintenance, or a complete waterproofing installation, Taylormade Waterproofing delivers expert workmanship and dependable protection. Contact us today to discuss your requirements.
