An overview of the App membrane

APP (Atactic Polypropylene) commercial roofing membranes are a type of roofing material used in flat or low-sloped roofing systems. They are made by combining asphalt with a plastic or rubber polymer and are often used in built-up roofing (BUR) systems.

They are known for their durability and flexibility and are often used when the roof may be subjected to movement or expansion and contraction due to temperature changes. They are also resistant to punctures and tears and can be easily repaired if damaged.

These membranes are typically installed in layers, with the top layer acting as a protective surface resistant to UV radiation and weathering. They are a popular choice for commercial and industrial buildings and other types of low-sloped roofs.


Roofs are just one place where these membranes can be used. Waterproofing membranes protect artificial ponds, bathrooms, water tanks, curtain walls, and concrete channels from water ingress. They are long-lasting waterproofing materials that contractors widely use to protect surfaces from leakage.

When applying a waterproof app membrane, it is vital to ensure that the coating material is resistant to abrasion and can accommodate building movement. A bond breaker and foam rod at the perimeter can help with movement accommodation.

The desired dry film thickness (DFT) can vary depending on the application, with wet area walls needing a DFT of 0.6-1 mm, floors needing 1-1.3 mm, podiums and balconies needing 1.5-2 mm, and pools, pits, and planter boxes needing a minimum of 2-3 mm.

To achieve the optimal DFT, applying multiple thin coats rather than one thick coat may be necessary. It is essential to carefully prepare the substrate to achieve the desired thickness for optimal performance.


Some of the key features include durability and flexibility. APP membranes are known for their long lifespan and ability to withstand extreme weather conditions. They are flexible and can withstand movement, expansion, and contraction due to temperature changes.

They resist punctures and tears, making them less prone to damage from foot traffic or other external forces. If a membrane is damaged, it can be repaired quickly, helping to extend the roof’s life.

The top layer of the membrane is resistant to UV radiation, helping to protect the roof from weathering and fading. They are often made with reflective materials that can help to reduce energy costs by reflecting sunlight and heat away from the building, making them energy efficient.

The membranes can be installed quickly and easily, making them a cost-effective choice for commercial roofing projects.


Benefits include the absence of seams which allows for 100% protection against leakage, excellent UV resistance, and the ability to withstand rapid temperature changes. APP bitumen is also fire resistant and has improved flow resistance at high temperatures, making it suitable for cold areas.

In addition to its flexibility, which allows it to withstand harsh atmospheric conditions, it also offers excellent adhesion and elasticity, making it suitable for protecting commercial buildings. Many manufacturers offer warranties for membranes, ranging from 10-20 years, providing added protection for those who choose to use this waterproofing material.


These membranes are not suitable for use on all surfaces and require a proper drainage system to be effective. With a proper drainage system, standing water can prevent the material from degrading and becoming ineffective. Additionally, they are not recommended for use on rooftop patios.

It is essential to carefully consider the suitability of this material for a given application to ensure its effectiveness in providing waterproofing protection.


This article givesa clear description of the waterproofing membrane for users seeking to understand its nature and what exactly this product entails.


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