• HYPERSEAL polyurethane sealant technology
    Concrete is an extremely stable and durable material, but it is not an unbreakable one. For several reasons such as natural forces like thermal expansion (freeze-thaw phenomenon) or poor construction design, failure of concrete making or overloading, active or dormant cracks are created. These kinds of active cracks need to be first appointed and then repaired in order to address any stability and to protect the waterproofing membrane that will follow. Although hairline cracks can be accommodated by the flexibility of the HYPERDESMO® System’s polyurethane waterproofing membranes, bigger cracks that are formed by continuous movement are crucial to be repaired in order to prevent their transmission to the waterproofing membrane which will cause raptures. The first step is to observe and analyze the crack movement in order to decide the appropriate repair method. The test can be taken by using a rigid but non-shrink material to bridge the surface of the crack. In case there are not any expansion joints installed to accommodate the tensile strength of the structure’s movement, it is strongly recommended to carve them prior to any installation.  A correct design of joints is required for the long-term performance and longevity of the system. The benefits of flexible polyurethane sealants in active cracks for controlled movement. Regardless of crack width, polyurethane sealants are suitable for the treatment of small or larger cracks ad they form a permanent, tough and elastic seal.  Moreover, they satisfy the major requirements for crack filling by being fast curing and having strong adhesion, strength, high elongation properties, good workability, stability and long-term performance. ALCHIMICA’s advanced polyurethane technology sealants offer excellent bonding to clean concrete. How to apply Opening the crack Cracks smaller than 5mm need to be opened manually at a minimum width of 5mm Substrate preparation The edges should be sound and clean from any grease or oil contaminants and a vacuum cleaner should be used to removing any dust. Application of HYPERSEAL sealants Using a caulking gun and with nominal pressure the sealant, fill the crack. Slightly excess amount should be applied for tooling and finishing purposes. Finishing and cleaning The sealant should be tooled immediately with a spatula by pressing against the joint to remove air pockets and to ensure 100% contact and adhesion with the surface. Learn more about HYPERSEAL® polyurethane products
  • Geotextile Membranes -ALCHIMICA
    In the construction industry, professionals are always looking for new ways to improve the efficiency of their installations and deliver durable projects using new materials and methods. In the case of waterproofing system installations, geotextile reinforcement provides an important benefit of reinforcing elastomeric materials for a long-term protective solution because they are more effective than a glass mesh, or fiberglass mesh, both of which can also be used for the same purpose. Geotextiles are fabric made sheets that are used as reinforcement in various applications but mainly are used in drainage and construction projects. For the most difficult and demanding areas of construction to a simple concrete roof, geotextile fabrics can be used for drainage and filtration purposes, for stabilizing the ground or even in reinforcement materials. They are divided in two categories, the non-woven and the woven geotextiles, which both have differences on how they are produced, their properties and how they are used in applications. Woven geotextiles have a high load capacity and tensile strength, are mainly impermeable and they are ideal for stabilization and reinforcement applications. On the other hand, ideal for waterproofing applications are the non-woven geotextiles which although they possess a lower tensile strength, they provide durability and ease of application benefits. Geotextile in waterproofing applications Geotextiles protect and separate a membrane from a structure. With their pre-brake elongation capacity, higher than other materials such as glass mesh or fiberglass mesh, they can follow the movement of elastomeric waterproofing materials, achieving reinforcement and long-term durability. It is common for unsound substrates to have high movement or large cracks which can cause problems on unarmed waterproofing membranes, causing tearing of the membranes and/or loss of adhesion. Even if the elastomeric waterproofing membranes hold great elongation properties, they still need reinforcement because the crack’s width may increase in the future. In that way they prevent the potential creation of future cracks in membranes. To effectively seal and protect details in an area like a roof we can use wet on wet a waterproofing membrane with geotextile, securing their efficiency against water ingression and mechanical pressures. This is a reliable method of reinforcing construction details, flashing, joints etc. and repairing existing cracks and gaps. ALCHIMICA offers a high-tensile strength range of non-woven geotextiles, made of 100% polyester fibers, manufactured with the needle punching process. They can be applied on the full surface between the first two layers of the HYPERDESMO® System, providing the required reinforcement of waterproofing in certain applications (i.e. over old bitumen membranes, unsound screeds) by preventing the potential creation of future cracks They are suitable for either solvent-based or water based liquid waterproofing systems. Find more about our products:
  • Aliphatic top coats and protective coatings
    A top coat is defined as the protective coating which is applied to the surface of another material in order to protect it and prevent deterioration. In the case of waterproofing and flooring systems, the protective coat resins are applied as a final layer enhancing the system’s performance and durability. Their application can span from ordinary roof waterproofing systems that require access and trafficability, to exposed car parks waterproofing systems and industrial flooring applications. There are 2 categories of top coats, the aliphatic protective resins for exposed use and top coats that offer high mechanical and chemical resistance for industrial applications. Aliphatic top coats offer full UV resistance, prevent chalking, cracking or any other UV degradation while they increase the system’s overall performance in terms of mechanical properties. Top coats for industrial applications give high scratch and chemical resistance, making them suitable to industrial flooring applications such as F&B factories, hospitals, as well as desalination and waste water treatment plants. The professional applicators can deliver successful projects using protective coat resins by increasing the main membrane’s life cycle and prevent in this way any future maintenance costs. In the case of a roof waterproofing project a top-coat installation is recommended to the end-users for achieving the optimal result. Apart from the fact that adds protection and durability to a waterproofing system, it becomes part of cool roof system when is applied in white color which improves the energy efficiency of buildings and supports the development in urban sustainability for cooler and healthier environments by reflecting most of the energy of the sun. Moreover, using a top-coat in a system built- up allows the applicator in certain cases, to apply only one layer of the main waterproofing membrane. Similarly, protective coat resins ensure the efficient and successful delivery of flooring. The top-coat main benefits to be considered are: Protection: Protect from weathering, abrasion, chemicals and UV radiation, salt or sand impact. Application: Easy to apply. Mechanical resistance properties: Play a key role in increasing the mechanical resistance of a waterproofing/flooring system, thus offering trafficability whether in exposed car parks or industrial floors with heavy usage. Aesthetics: Provide different aesthetic results such as different colors, chips and flakes finishes, glossy or matte effects. Durability and energy efficiency: Thanks to their high mechanical and chemical resistance, they offer weathering protection which improves the durability, providing extended working life of the system. In addition, because of their ability to reflect UV radiation when applied in white color, they help reduce the cooling costs of the building. ALCHIMICA’s aliphatic solutions ALCHIMICA’s range of protective coatings has a large number of applications in both waterproofing and flooring solutions. They are a part of ALCHIMICA’s full systems -that include primers and main membranes- and when applied they significantly increase the lifespan of our systems by adhering perfectly to our main membranes and forming the highest level of protection. ALCHIMICA’s aliphatic solutions expand on 3 different technologies: solvent-based, water-based and 100% solids products. They are fully aliphatic and provide excellent color and UV protection with no yellowing effects. They increase traffic resistance and assure high chemical resistance, forming the highest level of protection. Find out more about ALCHIMICA’s aliphatic top coats and protective coatings  
  • Water ponding resistance - Hyperdesmo
    Ponding water effects in flat roofs with poor slope designs and ALCHIMICA’s polyurethane waterproofing system solution. In flat roofs that display poor construction and design it is rather usual to face the phenomenon of standing water. As when a flat roof has no inclined slopes and drainage issues, the water can easily remain for extended amounts of time and cause the ponding water effect. Water ponding is defined by the US National Roofing Contractor Association as "water that remains on a roof surface longer than 48 hours after the termination of the most recent rain event". This phenomenon may cause long term water leakage issues and the need for costly repairs. Moreover, the negative effects can affect the longevity of the roof substrate when more leaks appear and lead to concrete corrosion but also cause the damage of the existing applied roof waterproofing system. Liquid applied waterproofing systems can be effective solution to proactively prevent this kind of problems but they are also considered as a great solution for post-repairment actions. Liquid applied waterproofing membranes with high ponding water-resistance are capable to remain bonded with great adhesion to the substrate providing a great protection especially when puddles are being formed on the roof due to poor slope design. One way to test if the existing applied membrane keeps its adhesion abilities is to press it on the ponding areas. Without proper ponding water resistance properties, a waterproofing membrane will start blistering and peeling, leading to the roof system deterioration. Our HYPERDESMO® waterproofing membranes hold excellent water resistance properties with zero water swelling rate, being elastomeric with high UV, chemical and mechanical resistance and they protect roofs from harsh environmental conditions. Learn more about HYPERDESMO® waterproofing membranes here



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