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APP Bituminous Membrane
Terraces and roofs are directly exposed to rains, highly increasing the chances of a leakage. Applying APP waterproofing membrane serves as an excellent barrier against water penetration
APP-modified bitumen is a plastic bitumen blend, which is modified using plastic in the form of atactic polypropylene (APP). As installers begin to torch-apply APP, this type of plastic begins to melt at a point of 300F, where it melts into a liquid wax like substance which acts as an almost free-flowing liquid which can then be mopped across a surface. APP has a high temperature tolerance when heating, so is more user-friendly for installers.
APP waterproofing membranes work by preventing water from penetrating the surface they are applied to. They achieve this by creating a barrier against water that is strong, flexible and resistant to damage.
APP membranes are often used in conjunction with other roofing materials, such as insulation and roofing felts, to create a comprehensive roofing system
Reinforcement
There are several types of reinforcement materials used in bituminous membranes, including:
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Non- woven Glass fiber Reinforcement: provides tensile strength and dimensional stability
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Non-woven polyester fabric: provides tensile strength and stability
- Non-woven Polyester reinforcement reinforced with fiberglass filaments composite : Very high tensile strength, excellent elongation properties and good dimensional stability.
- Compound Base: High tensile strength and good dimensional stability
The choice of reinforcement material depends on the specific requirements of the roofing system and the desired properties such as reflectivity, dimensional stability, and resistance to environmental factors.
Surface Finish
The surface finish of a bituminous membrane refers to the final appearance of the membrane once it has been installed on the roof. The surface finish can have an impact on the overall aesthetic of the roof, as well as its performance. Some common types of surface finishes for bituminous membranes include:
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Sand finish: a rough, textured surface that helps to increase the coefficient of friction and improve slip resistance, Specially (White/Yellow)
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Granulated finish: a surface that is covered with small, granulated particles, typically made of a durable material such as aluminum oxide. This finish provides a high level of slip resistance and UV stability. Available in colors (Red, Grey, Green)
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Smooth finish: a smooth surface that provides a sleek, modern appearance, but may have lower slip resistance compared to other finishes.
The choice of surface finish depends on the specific requirements of the roofing system, such as the desired level of slip resistance and the type of roof deck.
Methods of Installation
The installation methods for APP (Atactic Polypropylene) bituminous membrane vary depending on the specific requirements of the roofing system and the type of membrane being used. Some common methods of installation include:
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Heat welded seam method: involves heating the overlapped edges of the membrane with a propane torch to create a seamless, watertight bond between the two pieces of membrane.
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Self-adhesive method: involves removing the release paper from the self-adhesive backing on the membrane and pressing it onto the roof deck.
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Torch-on method: involves heating the bituminous membrane with a torch and then pressing it onto the roof deck, where it will fuse and adhere to the surface.
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Mechanically fastened method: involves using special mechanical fasteners to attach the membrane to the roof deck.
The choice of installation method will depend on factors such as the type of roof deck, the local building codes and regulations, and the desired level of seam strength and durability. It is recommended to seek the guidance of a professional roofing contractor for the installation of an APP bituminous membrane.
APP Bituminous Membrane Applications
Waterproofing
Bituminous waterproofing systems are designed to protect residential and commercial buildings. Bitumen (asphalt or coal-tar pitch) is a mixed substance made up of organic liquids that are highly sticky, viscous, and waterproof. These systems are sometimes used to construct roofs, in the form of rolls.
Construction and Architecture
Insulation specialists use the term, “thermal envelope” or “building envelope” to describe the conditioned space inside a building suitable for humans. The lack of natural airflow in a building creates the need for mechanical ventilation and high humidity, which results in condensation, rotting materials, and microbial growth like mold.
