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SBS Bituminous Membrane
SBS-bitumen is flexible. This flexibility means it has recovery properties, making it capable of withstanding stresses created by wind, temperature fluctuation, expansion and contraction.
SBS-Modified bitumen consists of bitumen with a synthetic rubber modification, adding styrene-butadiene-styrene (SBS) offering a ‘sticky’ melt which increases the hotter it gets. This lack of liquid flow means it takes less heat to install and allows a faster installation . SBS systems can also be installed with cold adhesive on projects where open flames are not permitted.
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
SBS (Styrene Butadiene Styrene) bituminous membranes are installed using a variety of methods, including:
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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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Cold adhesive method: involves using a cold-applied adhesive to bond the membrane to the roof deck.
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Mechanically fastened method: involves using special mechanical fasteners to attach the membrane to the roof deck.
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Ballasted method: involves placing heavy stones or pavers on top of the membrane to keep it in place, without the need for fasteners or adhesives.
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 SBS bituminous membrane.
SBS 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.
