Exposed fastener metal roofs are a common type of metal roofing where screws or nails are visible on the surface, often with rubber washers to prevent leaks. These fasteners penetrate the metal panels, securing them to the roof deck and creating points that, over time, could potentially let moisture in if not maintained properly. Cool roofs are designed to reflect more sunlight and absorb less heat than standard roofs, primarily through reflective coatings or light-colored materials. When it comes to eligibility for cool roof programs or certifications, the presence of exposed fasteners can affect performance. The fasteners themselves are small compared to the overall roof surface, so the metal panels’ reflective qualities typically determine the roof’s coolness. However, if the fasteners rust or the washers degrade, they can become weak spots where heat is absorbed or moisture enters, undermining both the cool roof’s effectiveness and the roof’s durability.
To check if your exposed fastener metal roof remains a good candidate for cool roof benefits, a simple homeowner inspection is helpful. Look for signs of rust, missing or cracked washers, and loose screws, especially around roof penetrations or edges. Carefully running your hand over the fasteners to feel for any looseness or shifting can indicate where maintenance is needed. While these are safe DIY checks, any visible damage or frequent loosening means it’s time to call a professional roofer for a thorough examination and repair. When speaking with your contractor, ask if the fasteners are compatible with cool roof coatings and what specific maintenance they recommend to keep your roof’s reflectivity and warranty intact. Also, inquire about the best practices for protecting exposed fasteners during the application of any reflective paint or coating to ensure lasting cool roof performance.