Metal Roof Systems – Commercial
Learn More About Standing Seam Metal Roofs
Many different types of metal roof systems can be found on commercial structures. Standing seam metal roofs, coping, flat lock roof systems, flashings, perimeter edge metals, gutters and downspouts, and through wall scuppers are commonly fabricated and installed by roofing contractors. Metal is also used in flashings, trim, and copings. Metal systems are recommended by roofing professionals because of their longevity, durability, appearance, resistance to wind, reflectivity, and resistance to fire. Many metal roofs currently in service around the world have been in place for hundreds of years.
Featured Metal Roofing Project: Cabela’s @ Liberty Township
The successful installation of a metal roofing system begins with several design considerations, including the following:
- Roof Pitch – Standing seam metal roofs are typically recommended on slopes greater than 3/12. Flat lock roofs are recommended on slopes 3/12 or less.
- Type of Metal – Dissimilar metals can corrode when they come in contact with one another or drain on each other. Also, some metals are naturally weathering while others require painting.
- Thickness of Metal – The gauge or weight of metals must be considered for different types of installations and applications.
- Interior Building Conditions – Vapor barriers or corrosion protection on the underside of the roofing panels must be considered if vapor is able to infiltrate the roof panels.
- Type of Fastener – Rivets, nails, and screws used in metal roofing applications must be compatible with the metal being installed.
- Thermal Movement – Metal, like all building materials, expands and contracts when exposed to changes in temperature. Metal roofs and box gutter liners can fail if the panels are not secured in one direction and able to float in the other.
- Underlayment and Slip Sheets – Combinations of Rosin paper, asphalt felt, and (high temperature) ice and water shield are used to allow the metal panels to expand and contract without tearing the underlayment. The low melting point of the asphalt must also be considered as some metal systems can reach temperatures of 200 degrees Fahrenheit.
- Metal Finish – Factory applied paint finishes for steel or aluminum are available in a wide variety of colors. Metal roof systems installed on churches, schools, or other historical buildings commonly use naturally weathering metals such as copper, stainless steel, or zinc.
After a proper design is specified, a skilled sheet metal foreman will install the metal system.