When weatherproofing a metal roof, choosing the right sealant is crucial to prevent moisture infiltration. This article outlines key considerations when selecting the appropriate sealant for your project.
Types of Sealants Metal roofing sealants typically fall into three categories: silicone, polyurethane, and polymer. While all are considered high-performance sealants, their performance varies under different conditions.
Polyurethane Sealant Polyurethane is cost-efficient but may degrade when exposed to water. It's also less flexible in low temperatures.
Silicone Sealant Silicone offers excellent UV and water resistance but can be pricier and prone to tearing. It's ideal for high-temperature applications.
Polymer Sealant Increasingly popular due to regulatory changes and extreme weather resilience, polymer sealants offer versatility and come in various colors. They also have low VOC levels.
Cure Time Consider the sealant's cure time, as faster cures prevent dirt buildup during application.
Type and Class Sealants are categorized as Type S (single-component) or Type M (chemically cured), with classes indicating their expansion and contraction abilities. Recommended classes for metal roofing are 35 and 50, accommodating panel movement.
Choosing the right sealant ensures long-lasting protection and durability for your metal roofing project.