Torch-On Waterproofing Membrane and Liquid Applied Waterproofing Membrane are two of the most commonly used waterproofing systems for roofs, balconies, and concrete structures. Both prevent water penetration but differ in installation method, durability, flexibility, cost, and maintenance.

Below is a clear comparison.

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Torch-On Waterproofing Membrane vs Liquid Applied Waterproofing Membrane

1. Installation Method

Torch-On Waterproofing Membrane

• Comes in bitumen sheet rolls (usually 1m x 10m).

• Installed using a gas torch to heat the membrane and bond it to the surface.

• Requires skilled workers and hot works safety precautions.

Liquid Applied Waterproofing Membrane

• Applied like paint using roller, brush, or spray.

• Usually requires 2–3 coats with curing time between layers.

• No open flame required, making it safer for certain sites.

Summary:
Torch-on = heat-applied sheet
Liquid membrane = coating system.

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2. Seam vs Seamless System

Torch-On Membrane

• Installed in overlapping sheets, creating seams.

• If seams are not installed properly, water may penetrate through gaps.

Liquid Applied Membrane

• Forms a seamless continuous waterproof layer.

• No joints or overlaps that could fail.

Summary:
Liquid membranes reduce leak risk at joints.

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3. Durability & Strength

Torch-On Membrane

• Thick bitumen sheet with reinforcement.

• Very strong and resistant to mechanical damage.

• Common lifespan 15–20 years depending on maintenance.

Liquid Applied Membrane

• More flexible but thinner.

• May be more vulnerable to physical damage in heavy traffic areas.

• Some systems last 20–30 years when properly installed.

Summary:
Torch-on = stronger sheet
Liquid = flexible but may need protection.

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4. Application Area

Torch-On Membrane Best For

• Flat concrete roofs

• Commercial buildings

• Large surfaces

• Areas needing strong membrane protection

Liquid Applied Membrane Best For

• Complicated roof shapes

• Pipe penetrations and joints

• Gutters and small areas

• Renovation waterproofing

Liquid systems adapt better to irregular surfaces.

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5. Cost

Torch-On Membrane

• Usually cheaper material cost.

• Faster installation for large areas.

Liquid Applied Membrane

• Higher material cost but may provide longer warranty and lower maintenance.

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6. Safety During Installation

Torch-On Membrane

• Requires open flame (gas torch).

• Fire risk if done in sensitive areas.

Liquid Membrane

• Cold applied system (no fire risk).

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Quick Comparison Table

Feature	Torch-On Membrane	Liquid Applied Membrane
Installation	Gas torch heated sheets	Brush/roller coating
Seam	Has joints and overlaps	Seamless layer
Strength	Very durable	Flexible
Best Area	Large flat roofs	Complex surfaces
Cost	Lower initial cost	Higher but longer life
Safety	Fire risk during installation	No flame

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✅ Simple Conclusion

• Torch-On Waterproofing Membrane

  • Best for large concrete roofs and heavy-duty waterproofing.

• Liquid Applied Waterproofing Membrane

  • Best for complex areas, renovations, and seamless waterproofing.

In many projects, contractors combine both systems — torch-on for the main roof and liquid membrane for edges, drains, and details.

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✅ If you want, I can also explain:

• Which waterproofing is better for concrete roof in Malaysia climate (KL / Selangor)

• When contractors should use Torch-On instead of Liquid Membrane.