What Makes PM Silicone the Superior Roof Substrate – The Science of Silicone

Tue, Jun 04, 2024 at 11:20AM

There aren’t many markets in the country where good roofers and good roofing materials are as important as Florida. The sun may help give Florida its beautiful landscape and tourist appeal but it also wreaks havoc on roofs statewide. In this article, we will look at the science behind PM Silicone roof coatings and identify why they are the ideal solution for failing roofs throughout the Sunshine State.

High UV Resistance

As many Florida roofers know, white silicone roof coatings are highly UV resistant. Much of the UV reflectivity comes from the coating’s white color. A darker silicone will not reflect nearly the same amount of UV rays and dark colored or black coatings will actually absorb UV rays. White coating, however, does an excellent job reflecting the sun’s rays and keeping the roof and the internal building temperature cooler.

It’s not just about color, though. The UV reflectivity in PM Silicone is strengthened by the tight bond of the elements in the material form when cured. Because they are so tightly bonded, they are capable of resisting UV rays without rapidly deteriorating. The molecules that make up PM Silicone roof coatings are also highly thermal and light stable. Combining these two elements makes PM Silicone the perfect roof substrate to combat the hot Florida sun.

Water Resistance

Silicone coatings have been formulated with hydrophobic properties to make them extremely water resistant. Because of the way the elements bond together, the surface of a silicone roof coating – when examined under a microscope – has tiny protrusions smaller than a drop of water. These protrusions make it very difficult for water to grab onto anything and work its way past the surface of the coating. Since PM Silicone is liquid-applied to the roof, it creates a seamless, waterproof membrane on the roof that can last decades.

Built-in Elasticity

Although the chemical bonds of silicone coatings are extremely strong and tight, they are not so strong that they become brittle. PM Silicone is also flexible and elastic. The material can flex with different pressures, be it shifting in the building or new forces being applied to the roof surface. Despite possessing a very tight link between the molecules, the chemistry of silicone roof coatings allows them to remain elastic, which adds more years to the coating.

High Solids Content

Silicone roof coatings are manufactured by mixing many chemicals, beginning with resins that are 100 percent solids. Most other roof coatings start with a lower solids base and include filler in the formula, which disallows their solids content to get much past 50-55 percent. These higher solids content allows PM Silicone roof coatings to be installed thicker, in fewer coats, with more precision and with a smoother surface. Florida roofers can enjoy time and money savings when using PM Silicone as they can typically get proper mileage in just one coat.


Again, thanks to the extremely tight and strong bond of the molecules in silicone roof coatings, they are impermeable. Rather than just resisting water and allowing water to run off them, their molecules are so tightly bonded and so complexly organized that they cannot be permeated. This ponding water resistance is a significant advantage of PM Silicone roof coatings. PM Silicone also resists many chemicals that could spill onto the roof, offering even more protection.


As you can see, PM Silicone roof coatings are ideal for the Florida market. They are scientifically created specifically to resist the rain and UV rays even in heavier sunny and rainy areas like Florida. To find out more about PM Silicone, please visit pmsilicone.com or come see us at FRSA's Expo in booth 523.


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