Metal Roof Systems Explained
While single-ply membrane dominates the market share of commercial roofs, metal roofing is still a popular choice, especially when aesthetics are a requirement, on steep slopes (3:12 pitch or greater), and for large warehouses with minimal penetrations. If you’re considering a metal roof, we’ve got some basic information that can increase your understanding and set expectations.
“Traditional metal roof systems are comprised of a batt insulation with a vinyl facer, a seamed or through-fastened panel, and system-specific curbs, drainage, trims, and closures,” explains Jon Reiss, Vice President Operations, D. C. Taylor Co., Cedar Rapids, Iowa. Metal roofs are typically steel, but can also be made of aluminum, stainless steel, copper, or zinc. While the properties of the roofs vary based on material, generally speaking, metal roofs offer the following advantages:
- Durability. Metal roofs perform well in harsh weather. Despite denting, they can withstand severe hail and often have a Class 4 (the highest) impact rating. It’s even been reported that when designed and installed properly, some commercial metal roofs can withstand winds up to 140-150 mph.
- Long-Lasting. “Professionally installed metal roofs should be expected to last 40 years and beyond with proper maintenance,” says Reiss.
- Fire Resistance. Most metal roofs are made from non-combustible material and have a Class A fire rating.
- Sustainability. Metal roofs can be made with recycled metal and then recycled at the end of their life, contributing to points in the Materials & Resources category of the Leadership in Energy and Environmental Design (LEED) green building rating system.
- Appearance. “They come in multiple colors and can add to the aesthetics of a building if that is desired,” explains Reiss.
Be aware of their disadvantages. “Conversely, they are very expensive to install, add a level of risk as they are essentially ‘structural’ installations or replacements over open decks, and susceptible to expansion and contraction,” notes Reiss. “Making roof alterations is more difficult and costly on a metal roof, too.”
Understand the costs, both initially and over time. “The initial cost to install a metal roof is much higher than a single-ply assembly. Maintenance on metal roofs is minimal at first but increases quickly once the components start to fail,” Reiss says.
Maintenance for metal roof systems typically includes the following:
- Debris removal at drainage areas where it typically accumulates.
- Monitoring of flashing, penetrations, and any visible fasteners.
- Seam inspections.
- Inspections for panel degradation and rusting.
Another disadvantage to consider may be the installation time. “Our experience has shown that metal roofs are usually a slower install,” notes Reiss. He attributes this to the step-by-step process they require and because they utilize smaller crews. “Single-ply installs can be scaled to larger crew sizes and can speed up or slow down based on schedule requirements,” he explains.
Call D. C. Taylor Co. at 319.731.4118 or email [email protected] to discuss your roofing project.
Previous