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Roofs are made of various elements that together make the system truly strong. A roof coating is an outer layer that adds extra durability and functionality to the roof of your building.
At McClellands Contracting and Roofing, we allways aim to guide property owners through important insights about different parts of a roofing system. This allows you to make informed decisions.
Today we will discuss all about roof coatings, including the pros and cons of different types. From durability to lifespan, this complete guide will cover all about roof coatings.
What Are Roof Coatings?
A roof coating is a super-strong, stretchy layer that protects your roof from rain, sun, hail, and other weather conditions. It's a liquid that is applied to your roof’s surface. When it dries, it forms a solid, waterproof layer without gaps or seams.
Roof coatings are often elastic, which means they can stretch without getting damaged. This is helpful because roofs can expand and shrink as temperatures change throughout the year.
These coatings can be pretty thick, depending on the type chosen and the number of layers applied. However, consult with the best-rated roofing contractor in your area before deciding the number of layers you need to apply to your roof. Added layers will add more weight, so you need to make sure that the overall structure of your building can handle the extra load.
What Are The Different Type Of Roof Coatings? (Pros & Cons)
Several types of roof coatings are available, each with its own advantages and considerations. Let's check them out:
#1 Acrylic Roof Coatings
Acrylic roof coatings are affordable and work well, making them a top choice for many building owners.
The material can cost anywhere between $0.15–$0.80 per square foot, and the installation can cost between $0.50 and $3 per square foot.
| Pros | Cons |
| They provide superior protection from bad weather and are highly reflective, so they're good at blocking UV rays. | Ponding water on your roof can affect the functionality of acrylic roof coatings. |
| They are liquid-based layers that are easy to apply. | Acrylic roof coatings are a water-based solution, so they can freeze if applied in extremely cold weather. |
| Acrylic roof coatings are an affordable option for property owners who are looking for a cost-effective option. | Frequent exposure to harsh weather conditions can lead to a decreased thickness of the layer. |
| They generally last for up to 10 to 15 years. |
#2 Asphalt Emulsion Coating
Asphalt emulsion coatings, another popular roof coating, are made of asphalt, bentonite clay, and water. All the elements are then emulsified using a colloid mill.
| Pros | Cons |
| These are odorless and inflammable roof coatings. | Asphalt emulsion coating requires application at a temperature above 50 degrees. |
| They are an affordable option to consider. | They may not suit and function well on severely damaged roofs. |
| Asphalt emulsion roof coatings offer superior water protection and sealing. | The exact time they can take to cure can vary depending on the climatic conditions. |
| They are compatible with various roofing types. | Asphalt emulsion coatings have limited resistance to UV rays. |
#3 Elastomeric Roof Coatings
Elastomeric roof coatings can handle all kinds of weather, but they cannot be used on every type of roofing system. Elastomeric roof coatings are affordable and can be mixed with other coatings to make them more durable. This coating can cost anywhere between $0.15 and $0.80 per square foot.
| Pros | Cons |
| This roof coating type is highly flexible and stretchy. | They might not be the best choice for blocking UV rays. |
| It has good resistance to water and humidity. | It may require multiple coats for optimal performance. |
| Elastomeric coatings can improve energy efficiency. | It can be prone to dirt accumulation over time. |
#4 Polyurethane Roof Coatings
Polyurethane roof coatings primarily consist of isocyanates, polyols, and other additives that give the coating its consistency. These components create a durable, protective roofing solution. Polyurethane roof coatings are very stretchy and can adapt to different conditions easily.
Polyurethane roof coatings are available in two types:
a) Aliphatic coating: This is great at protecting against UV rays and is often used in really sunny areas. This type is generally applied as a top coat.
b) Aromatic coating: This doesn't protect against UV rays, but it's very flexible and can handle temperature changes. Aromatic coatings are often used as a base coat.
| Pros | Cons |
| Aliphatic coatings offer excellent UV protection. | Aromatic coatings have lower UV resistance. |
| They are highly flexible and adaptable. | It can be more expensive than other options. |
| They are durable and resistant to temperature changes. | They require careful application to avoid bubbling. |
#5 Bituminous Roof Coating
Bituminous roof coatings, as the name suggests, are made up of bitumen. Bitumen is sticky and black semi-solid petroleum or highly viscous liquid. This type of roof coating is like a force field against water and humidity. It uses special polymers to give your roof extra protection. However, this roof coating can only be used on certain roof types, including built-up roofs, modified bitumen roofs, and metal roofs.
| Pros | Cons |
| It provides superior protection against water and humidity. | It can be heavy and may require structural support. |
| Bituminous roof coating offers great adhesion to certain surfaces. | It may have a strong odor during application |
| It is a durable and long-lasting choice. It can last for up to 20 years. | There are limited color options and aesthetic appeal. |
#6 Silicone Roof Coating
Silicone roof coatings are made from silicone polymers. These coatings form a tough, flexible layer on your roof that keeps water out. They stand up well to harsh weather, including strong winds and extreme temperatures. Silicone coatings also handle the normal expansion and shrinking of large roofs due to temperature changes. This makes them a durable choice for protecting buildings from the elements.
| Pros | Cons |
| It offers excellent UV resistance and reflectivity. | This roof coating can be slippery when wet. |
| Silicone roof coatings are highly flexible and durable. | This type of roof coating requires proper surface preparation before installation. |
| It can withstand water ponding on your building’s roof. | They may not adhere well to certain roofing types. |
Additional Considerations to Make Before Coating Your Building’s Roof
While roof coatings are a great way to extend the lifespan of your roof, there are a few things to think about before choosing one:
1. Standing Water: Most flat roofs aren't perfectly sloped, which means water can puddle in some areas. Many roof coatings aren’t resistant to constant standing water, so this could be a problem.
2. Not for All Roofs: It’s generally not recommended to use coatings on roofs with shingles. This is because the coating might trap moisture under the shingles, which could lead to water damage.
3. Proper Application is Key: For roof coatings to work as intended, they need to be installed correctly. If they're not applied properly, they might not protect your roof as well as they should.
You might also like: Metal Roof Coating: Types, Best Products & Application Tips
Call McClellands Contracting and Roofing For Roof Coating In Pittsburgh, PA
If you are looking for a roof coating in Pittsburgh, PA, and the surrounding areas, we are here to assist you. We are one of the best-rated roofing contractors in Pennsylvania. Our commitment to serving you with quality workmanship has made us one of the most trusted companies in the region.
We understand that the roof of your building is a crucial investment. Our experts have the right skills, knowledge, and experience to work on various roofing types. Trust us as your reliable roofing contractor and we guarantee grade-A level services. To know more about our services, call us today at (412) 353-5660.
