Waterproofing is a crucial aspect of construction, especially in areas prone to heavy rainfall or where water intrusion can cause significant damage.
There are two popular waterproofing methods commonly used in construction: liquid-applied and torch-on waterproofing membranes. While both techniques serve the same purpose, they differ significantly in their application methods, materials, and performance characteristics.
Keep reading to find out the key aspects of both waterproofing membranes and what differs between them!
What is Liquid-Applied Waterproofing Membrane?
Liquid-applied membrane is typically made up of polymer-based materials (polyurethane, acrylics, elastomeric asphalt etc.) that contribute greatly to the membrane’s flexibility, adhesion, and resistance to environmental factors.
Additionally, some manufacturers may include additives in the formula to increase certain properties of the membrane waterproofing system, such as its UV resistance, crack-bridging capabilities and durability
What is Torch-On Membrane?
On the other hand, torch-on membranes are primarily composed of bitumen, a viscous, black, and sticky substance derived from petroleum that provides waterproofing properties and durability.
The two common types are known as Styrene-Butadiene-Styrene (rubber-modified asphalt) and Atactic Polypropylene (plastic-modified asphalt). Most of these membranes in the market have been modified to enhance their flexibility, elasticity, and resistance to temperature variations.
What are the Differences Between Liquid-Applied & Torch-On Waterproofing Systems?
Application Method
Liquid-applied membrane:
Due to its liquid form, the membrane is applied directly to the surface via brushes, rollers, or spray equipment. The liquid cures and forms a seamless, flexible membrane that adheres to the substrate.
This waterproofing process is considered less complex, and can be applied to numerous surfaces, including irregular or complex surfaces.
Torch-on membrane:
These membranes come in rolls and are applied by heating the underside with a heated torch. The heat activates the adhesive on the bottom, allowing the membrane to adhere securely to the substrate.
This waterproofing method is generally less forgiving of mistakes, and proper installation requires skilled labour and careful handling of the open flame.
Usage
Liquid-applied membranes:
Due to their flexibility, crack-bridging capabilities, and seamless coverage, these membranes are suitable for applications such as:
floor slabs
retaining walls
balconies
tunnels
foundations
carparks
Torch-on membranes:
In addition to their excellent adhesion and durability, torch-on membranes are resistant to damage from harmful sun rays, making them ideal for exposed, external environments such as:
flat roofs
low-slope roofs
areas with full water immersion (i.e. gutter)
planter boxes
decks
Cost
Liquid-applied membranes:
The cost of liquid-applied membranes varies depending on the specific product and application requirements. However, the general cost of labour is usually higher than the material cost.
That said, if any damage occurs, the membranes can be easily repaired by applying additional layers, providing a more cost-effective solution for addressing issues.
Torch-on membranes:
Conversely, the cost of using a torch-on membrane may be slightly higher as multiple layers need to be applied. Still, the installation process is often quicker, which can potentially result in lower labour costs.
When installed correctly, the torch-on membrane is incredibly durable, serving as a long-lasting waterproofing solution!
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