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ADVANTAGES OF "PU" WATERPROOFING

1. EASY APPLICATION: The Liquid material requires no mixing and in most cases no primer. "PU" can be easily applied using a brush, roller or airless spray gun on a clean and dust free surface.
2. ADHESION: Strong adhesion to almost any surface, including those surfaces that already have waterproofing materials on them.
3. IMPERMEABILITY/MINOR CRACK SEALING: "PU" covers the whole surface monolithically without joints. It ensures the complete sealing of all capillary cracks and pores, thus effectively waterproofing the surface for a very long time. High elasticity of the curedmembrane protects the surface from deterioration. This is especially important for the protection of reinforced concrete structures.
4. IMPACT RESISTANCE: "PU" protects surfaces from abrasion and impacts. In principle it gives the properties of a soft metal. It is ideally suited for industrial applications and floors with heavy traffic, where abrasion and impact are primary reasons of surface deterioration. Reinforcement with non woven geo-textiles is also possible for further enhancement of mechanical properties.
5. THERMAL BEHAVIOR/ELASTICITY: The cured membrane retains its elasticity at temperatures ranging from -50°C to + 100°C, preventing it from cracking. This ensures excellent waterproofing results even when thermal expansion or contraction deforms the surface underneath or when cracking occurs. It has an excellent cut and tear resistance. Other waterproofing products like bitumen, tar, PVC, acrylics, Polyethylene, etc, become rigid and friable at low temperatures and soft and tacky at high temperatures, allowing water to penetrate the protected surface.
6. WEATHER RESISTANCE: "PU" is resistance to extreme heat and cold, hydrolysis, ozone oxidation, UV radiation and acid rain. It is furthermore not effected by snow accumulation, unlike many other materials.
7. RESISTANCE TO MICRO-ORGANISMS AND HYDROLYSIS: "PU" is resistant to hydrolysis and to various micro-organisms. This guarantees the long lasting qualities of the membrane even on surfaces that are in continuous contact with fresh water, salt water, sewage, industial effluents and snow.
8. WATER VAPOR TRANSMISSION: Whereas the cured membrane is 100% waterproof, water vapor is allowed to diffuse, unlike waterproofing materials like bitumen, PVC, Polyethylene, and others. This unique property prevents the accumulation of humidity below the membrane.
9. CHEMICAL RESISTANCE: "PU" is resistant to alkali, salt, petrol, oil, weak acids. However it is not resistant to highly oxidizing acids some aromatic solvents and esters.

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APPLICATION

• Usually no primer is required for most surfaces. For costs reasons and enhanced adhesion a primer may be required. The surface must be clean and dry and free from oil and grease. Application is done by two layers applied by brush, roller or airless spray gun to a thickness of 1 mm for each coat.
• Recommended application temperatures range from 5-40°C. For cold weather applications, store the drums approximately at 20°C, prior to application. Make sure joints are frost free.
• Depending on weather conditions minimum 8 to 24 hours must elaspe before an optional second layer can be applied.
• Complete curing is accomplished in 4 days. The material is not affected by rainfall immediately after application.
• After opening the drums it is recommended to properly seal them, to avoid exposure to water vapour from the air, before applying it on the surface required.
• The product is odourless, non-staining, can be painted over with water, oil and rubber-based paints. It is recommended to first do a trial test to ensure the material has sufficient curing achieved.

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ADVANTAGES VERSUS OTHER MATERIALS

• ADVANTAGES VERSUS BITUMEN: The main advantage of "PU" over bitumen is abrasion resistance. The combination of a high tear resistance, ozone resistance and a high modulus gives this advantage. Further, the time required for applying is much less compared with bitumen.
• ADVANTAGES VERSUS METAL: "PU" can outwear metals in a lot of places, especially where parts are subject to abrasive materials. The resistance to corrosion makes it an ideal replacement for metals as well. The biggest advantage over metal is that it is much cheaper. Casting metals parts is much more expensive then casting "PU".
• ADVANTAGES VERSUS PLASTIC: As mentioned before the main advantage of "PU" over plastics is abrasion resistance. This is due to the fact that polyurethane's that the elastomeric properties that plastic (like acrylics, etc) lack. PU will, in most cases, return to its original shape when it has been scratched.

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WHERE TO APPLY

• ROOFS/BASEMENTS: “PU” is probably the most effective method available for waterproofing and protection of all kinds of roofs and basements. On the left is an example of a roofing application for a Swiss parking garage, demonstrating the products’ capability of both waterproofing the roof as well as its suitability for floors with heavy traffic. In this specific case the bitumen underneath the concrete was leaking. By applying “PU” the roof could be repaired at a very low cost. The product is applied in two layers. The contrasting red colour only serves the purpose of making sure that no part is missed when applying the second layer, with the desired colour. It is especially suitable for these applications as corners, light domes, etc, are easily and perfectly sealed. In many cases the Polyurethane is applied for the inside floors, both as protection, as well as for decorative and long-term cost-cutting purposes.
• BRIDGES: acid rain, petrol, oil, humidity accumulation and temperature changes destroy the conventional waterproofing materials, causing severe damage to the reinforced concrete of bridges. These problems are effectively and economically solved with the use of “PU”. On the left is an example of a recently built bridge near Athens, Greece.
• WATER TANKS: Complete impermeability is achieved in water tanks, sewage tanks, biological cleaning installations and other. The cured membrane is non-toxic and abrasion resistant and can be used as well in drinking water tanks as in irrigations channels. On the left is an example of repair work at a water treatment plant.
• TUNNELS: PU can be easily and quickly applied in tunnels for cars, trains and other, both on the inside and outside walls, with excellent waterproofing results.
• INDUSTRIAL FLOORS: Elasticity; strong adhesion, and resistance to abrasion and impact. PU offers an excellent solution regarding an effective and long lasting protection of industrial floors and floors with heavy traffic. For an example we refer to the parking garage above.