The Best Products to Seal a Flat Roof

The Best Products to Seal a Flat Roof

Sealing a flat roof is crucial for maintaining its integrity and extending its lifespan. With various products available, it’s essential to choose the right one based on your specific needs. Here’s a guide to some of the best options for sealing flat roofs, drawing insights from Nationwide Coatings.

1. Elastomeric Acrylic Flat Roof Coatings such as PERMAKOTE PLUS® Flat Roof Coating

Elastomeric acrylic roof coatings, such as PERMAKOTE PLUS® Flat Roof Coating, are water-based solutions that are both easy to apply and environmentally friendly. These coatings offer several benefits, including good reflectivity, which helps reduce cooling costs by reflecting sunlight away from the roof. They also have a quick drying time, making the application process more efficient. Another advantage is that they can be applied over existing roofing materials, providing a convenient option for roof maintenance. Additionally, elastomeric acrylic coatings are known for their durability and long lifespan. However, one drawback is that they do not hold up well to ponding water, which can affect their performance over time.

2. Silicone Flat Roof Coatings such as PERMASIL PLUS™ Silicone Roof Coating

Silicone roof coatings, such as PERMASIL PLUS™ Silicone Roof Coating from Nationwide Coatings, are highly regarded for their high reflectivity and moisture resistance. These flat roof coatings are particularly effective in ponding water situations, providing excellent protection and durability. They are long-lasting and easy to maintain, making them a practical choice for various applications. Additionally, silicone coatings are environmentally friendly and have low VOC (volatile organic compound) content, contributing to a healthier environment. However, one limitation is that they can only be recoated with silicone, which may restrict options for future maintenance. 

3. Polyurethane Coatings

Polyurethane coatings are renowned for providing a robust and durable finish, making them ideal for high-traffic areas. These coatings offer several benefits, including superior adhesion and flexibility, which ensure they remain effective even under stress. They also exhibit excellent resistance to chemicals and abrasion, making them suitable for environments where such exposures are common. Additionally, polyurethane coatings provide long-lasting protection against water and UV rays, helping to maintain their integrity over time. Another advantage is their good ponding water protection, which ensures they perform well even in areas where water tends to accumulate. However, one notable disadvantage is that polyurethane coatings usually require an acrylic top coat and need to be recoated often to maintain their effectiveness.

4. Liquid Rubber Coatings

Liquid rubber coatings are a versatile and durable option for various applications, thanks to their polymer resin composition. These coatings form a seamless membrane that offers excellent waterproofing properties, making them ideal for protecting surfaces from water damage. Additionally, liquid rubber coatings are flexible enough to withstand temperature changes, ensuring they remain effective in different environmental conditions. They also boast good UV resistance, which prevents degradation from prolonged exposure to sunlight. However, one notable disadvantage is that most liquid rubber coatings are made with plasticizers that have a limited lifespan. Over time, these plasticizers can diminish, causing the coatings to become brittle and eventually fail after their elongation properties are compromised.

Choosing the right product to seal a flat roof depends on factors like climate, roof condition, and budget. Liquid rubber, acrylic, polyurethane and silicone are all excellent choices, each with unique benefits. For the best results, consider consulting with a professional to assess your specific needs and ensure proper application.

Nationwide Coatings has the right product for all your roofing needs. Inquire today for a free consultation and product assesment.