Single-layer polymer membrane
FLL approval for green roofs:
FLL certification is the most demanding roof membrane test for approval for use under garden or green roofs. KÖSTER TPO membranes have received official approval from Hochschule Weihenstephan-Triesdorf University of Applied Sciences, Institute of Horticulture, Freising, Germany. This certification confirms that KÖSTER TPO membranes are suitable for use under ground, vegetation and greenery in green roof applications.
TPO membranes for different applications:
KÖSTER is one of the oldest and few TPO manufacturers in the world, with almost 30 years of experience in the production of single-layer thermoplastic roofing and waterproofing membranes. Besides the general advantages of TPO membranes, KÖSTER stands out in the production of PE-based TPO with all its advantages, while many competitors produce PP-based TPO. Furthermore, KÖSTER membranes have a unique feature where both the top layer and the bottom layer are made of the same quality material, which ensures perfect UV stability throughout the thickness and facilitates homogeneous welding of the seams.
Apart from the chemical differences between PE and PP, the practical advantages of PE over PP are significant. PE is highly flexible and combines high tensile strength and abrasion resistance, making it an excellent choice for a roofing membrane that requires both durability and flexibility. PE is also more resistant to UV radiation than PP, which is an advantage for roofing membranes exposed to direct sunlight. PE is the best polymer to withstand extreme temperatures, especially low temperatures, making it the optimal choice for low or ultra-low temperature climates. In addition, PE exhibits better resistance to a wider range of temperatures compared to other materials used in waterproofing and roofing membranes. PE is also resistant to many chemical aggressions and pollution, such as acids, alkalis, alcohol and oil.
Not all TPO membranes are the same. Each manufacturer has its own recipe with specific ingredients and additives, making each brand different. One important difference is the type of polymer used to make the product. It can be based on PE (polyethylene) or PP (polypropylene). KÖSTER TPO membranes are based on PE and include several additional elements in their recipe to improve performance and offer a superior quality membrane.
Specific TPO membranes:
Compared to other types of membranes, TPO combines several advantages. It does not contain toxic or hazardous ingredients, making it environmentally friendly. Its heat-reflective properties make it energy-efficient. TPO membranes are fully recyclable, resulting in a low environmental impact. One of the best features is that TPO does not contain plastic materials like PVC membranes, relying on its polyolefin structure to maintain flexibility throughout its life cycle, providing unique durability benefits.
TPO stands for Thermoplastic Polyolefin, and is a type of single-layer polymer membrane that uses thermo (hot air) welding to join the seams. This type of membrane was originally developed in the 1980s and is currently the fastest growing membrane in the roofing and waterproofing industry.
While traditionally used on flat roofs, KÖSTER TPO membranes can be used in several application areas as a waterproofing material. These membranes are suitable for drinking water tanks, water treatment tanks and underground structures such as tunnels and basements. They can also be used in various roof application techniques, including loosely laid systems under ballet or green/garden roofs, mechanically fastened systems, strip adhesive systems, and even a special self-adhesive membrane called KÖSTER TPO SK.
