Understanding Elastomeric Roof Coatings

The term 'elastomeric' is sometimes used loosely in the context of weatherproof coatings for diverse roofing systems. Such coatings may or may not contain rubber or plastic materials, but they are designed to provide flexibility and durability against various weather conditions. Proper application and preparation of the substrate are crucial for achieving the best results. Whether you are facing a flat or sloped roof, understanding the different types of elastomeric coatings is essential for selecting the right one for your specific needs.

Types of Elastomeric Roof Coatings

Butyl Acrylic Polyurethane and Silicone Coatings

There are four main types of elastomeric roof coatings: Butyl, Acrylic, Polyurethane, and Silicone. Each type is best suited for different types of roofs and climate conditions.

Butyl Elastomeric Roof Coating: Ideal for flat roofs and single-ply or built-up PVC roofs. It excels in water resistance and acts as a vapor barrier, making it a popular choice for low-sloping roofs. Acrylic Roof Coating: Best for over-sloped roofs. It provides excellent resistance to heat and UV damage, making it a reliable choice for roofs with higher slopes. Polyurethane Coating: Excellent for EPDM rubber roofs. It offers superior adhesion and flexibility, ensuring a strong bond even under harsh weather conditions. Silicone Coating: Ideal for polyurethane foam roofs. It is highly resistant to heat and UV radiation, making it a popular choice for high-temperature environments.

Factors to Consider When Selecting Elastomeric Coatings

When choosing the right elastomeric roofing coating, several factors must be taken into consideration, such as suitable substrate conditions, the care and experience of the applicator, weather conditions, rooftop traffic, and the slope of the roof. Additionally, the presence or absence of standing water, ice, algae, and other rooftop conditions can significantly affect the performance of the coating.

Ensuring Optimal Performance

The performance of any coating is also influenced by the quality and compounding of the materials used. Key factors include UV stabilizers, heat absorbers, pigments, binders, fillers, carriers, shelf-life, and storage conditions. The track record of existing installations is also a critical factor to consider, as it provides valuable insights into the performance and longevity of the coating.

Standards and Requirements

While there are standards and requirements for elastomeric coatings, such as ASTM, BS, DIN, UL, and FM Global, these are often the bare minimum standards. Meeting these standards does not guarantee optimal performance or longevity. It is essential to perform thorough due diligence, including extensive research and analysis of product specifications to ensure that the coating meets your specific needs.

Final Thoughts

Many coatings, including elastomerics, are sold with long-term warranties. However, these warranties are often limited and may have fine prints. It is recommended to exercise caution and conduct thorough due diligence before selecting a coating for long-term functionality and service life.