Polyurea VS Silicone Roofing

When it’s time to repair or replace commercial roofs, businesses have many choices to consider. A major and crucial choice is which roofing products to select. There are numerous kinds of roof coatings available, and two options include polyurethane and silicone roof coatings.

In this blog we will discuss the differences between polyurethane and silica roof coatings and show which is the best choice for your roof.

Polyurethane Coatings and. Silicone Coatings

Both polyurethane and silicone are elastomeric roof coatings made to expand and contract according to the motion of the roof. Polyurethanes generally have a higher percentage of solids than silicone roof coatings.


The two types of roof coatings are applied by rolling and spray application. Since they’re coatings, they both allow you to repair the current roof by coating on top instead of taking off the current roof and re-installing it. This can reduce time and money and stop further materials from being disposed of, reducing their environmental impact.

Cool Roofs

The two polyurethane and silicone coatings are available in white colors with high SRI values. This is beneficial since these highly reflective coatings can reduce cooling requirements during the warmer summer months, which decreases the stress of the grid. This also decreases the amount of black and brownouts. The more structures with “cool roofs” in a particular area, the higher the decrease in the outdoor air temperature in that region because these roofs reflect the sun’s rays into the atmosphere, which decreases the formation of ground-level ozone, also known as smog.

Ponding Water

In the case of flat or low slope roofs, silicones and polyurethanes are ideal for waterproofing. In most flat or low slope roofs, there may be areas that aren’t sloped correctly towards the drains, which could cause ponding water to form over the roof. Both silicones and polyurethanes are ideal for ponding water that won’t cause any harm to them, in contrast to. Acrylic coatings are water-based and can wear away when exposed to water ponds, leading to roofing failures.

Pedestrian Traffic

Since both are coatings that are made of plastic, they may be slippery when they are wet. In general, it is suggested to spread aggregate onto the coatings in clearly-marked areas for pedestrians or paths leading to areas of the roof which need to be maintained, e.g., HVAC units.

Tears and Impact Resistance

This is the point at which the coatings may begin to change. When maintaining cooling towers, HVAC unit tools are susceptible to being dropped. There are two coating alternatives; polyurethane is the much more durable coating and won’t break easily when a tool is dropped, or furniture is moved over its surfaces. This isn’t the case with silicones that can be punctured easily.

Dirt build-up

Another problem that comes with silicone coatings is that silicon is believed to attract dirt and dirt, as well as airborne particles. This could lead to an accumulation of dirt on the roof that could cause your coating system more vulnerable to the sun’s heat and, consequently, less reflective. This negatively reduces the advantages you get from the benefits of a “cool roof”. To overcome this issue, the roof should be pressure cleaned every six months or more. This isn’t a problem with polyurethane roofing.

Future Roof Replacements or repairs

The most significant difference could result from a roof repair or replacement. Polyurethane roofs are regarded as “Forever roofs” in that, once they cross the 15 to 20-year mark, their life span is extended by an additional fifteen to twenty years by applying the polyurethane topcoat over the to the existing roof. In essence, you’ll remove the solvent-based polyurethane roof topcoat and then roll or spray apply the new polyurethane topcoat over the top. This allows for simple roof repairs if they are needed.

With silicone coatings, it is difficult for anything to stick to silicone and even not silicone. This can cause issues from the perspective of a roof replacement and also from the repair aspect. If the roof is reaching the end of its lifespan, instead of applying a new topcoat, you’ll require the removal of the membrane of silicone before installing an entirely brand-new roofing structure.

Please contact ArmorThane for Polyurethane Roof Coatings in Canada or the United States

If you’re looking for the most effective polyurethane roof coatings in Canada or the United States, Look for ArmorThane. We offer a broad range of polyurethane roof coatings from industrial to commercial grade. Our team of experts will assist you in finding the right coating that is suitable for the roof, regardless of whether it’s the first time you build it or a remodel. Get in touch with us now to learn more about our services and what we can do to help protect you and your roof.

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