Polyurethane roof coatings are one of our most popular roofing systems, delivering long-term durability that is difficult to match. This unique roofing solution offers a variety of benefits and creates a long-lasting liquid waterproofing membrane which can be used on all types of flat and pitched roofs.
History of Polyurethane
In 1937 German chemist Friedrich Bayer developed first prototype of polyurethane fibre known as Perlon PU. In 1940 first polyurethane elastomers were successfully developed. The characteristics of polyurethane material was similar to rubber, but rare and expensive.
By the end of World War II, PU coatings were being manufactured and used on an industrial scale and custom formulated applications. Later scientists could able to synthesise polyurethane into fine threads and combining it with nylon to form a stretchable lightweight material. In 1953, first commercial production of polyurethane foam begun in the US. It was a rigid foam and used as thermal insulation material, with a flexible variety of foam along with various mouldable polyurethane being introduced in 1956.
Today, processes of polyurethane production have been perfected to produce it for different applications like coatings, fibres, thermoplastics, mouldings for automobile exterior parts and one component system. Now, virtually polyurethane can be found in our daily uses named as furniture, footwear, cars, appliances, bed mattresses, and as well as thermal insulation and coatings covering both corrosion protection, floor coating and waterproofing.
This particular type of roof coating was introduced in the UK during the 1960s. They were initially developed to provide a protective barrier for industrial and commercial flat roofs against weathering and moisture infiltration and polyurethane coatings are now commonly used in roofing solutions for a range of buildings, from large commercial structures to domestic properties.
How it works
Polyurethane roof coatings are a liquid-applied roofing system that provides a seamless waterproof membrane to protect flat and low-slope roofs and the versatility of polyurethane coatings means that they can be used on many types of roofs including metal, concrete, built-up, modified bitumen, and single-ply roofing systems.
To apply the coating, the roof surface must be cleaned, dried, and free of any debris, and any potential leaks or damages should be repaired. They can be sprayed or rolled onto the roof to create a seamless and durable finish that protects the roof from weather damage, leaks and supports energy efficiency.
The longevity of polyurethane coatings depends on various factors such as maintenance, weather conditions, and the quality of the product used. However, most coatings last between 10 and 20 years and with proper maintenance, such as regular cleaning and inspection, the life span of the coating can be extended further.
Benefits of Polyurethane Roof Coatings
- Polyurethane roof coatings provide superior protection against weather elements, UV rays, and wear and tear.
- They can be applied to a variety of roofing materials, including metal, concrete, and asphalt shingles.
- These coatings are resistant to cracks, peels, and other forms of damage caused by environmental factors.
- They form a seamless, waterproof barrier that eliminates leaks and reduces the need for costly repairs.
- Polyurethane roof coatings are energy efficient and can reduce energy consumption by reflecting sunlight and heat away from the building.
- They increase the lifespan of the existing roof, preventing premature replacements and the associated expenses.
- Polyurethane coatings are easy to apply and dry quickly, minimising the disruption to the building’s occupants.
- They are environmentally friendly and do not emit harmful VOCs (volatile organic compounds) into the atmosphere.
Polyurethane roof coating systems form an incredibly durable and flexible monolithic membrane layer. They can effectively withstand the daily expansion and contraction (thermal movement) of roof structures as well as the damaging effects of ponding water and they are also more impact-resistant than other coating materials, making them ideal for use on roofs with high-traffic areas.
For further information on polyurethane roof coatings, please contact us here.