Architectural Metal
Historically, metal roof systems may be traced to Europe, where they have been applied for centuries. In the United States, some of the earliest high-value structures were covered with metal roofs.
More recently, metal roof systems have grown in popularity.. Sale of architectural metal roof systems nearly doubled between 1997 and 2000. As of 2002, metal roofing was the fastest-growing residential roofing product, comprising 6% of the total market.
According to the National Roofing Contractors Association, “Architectural metal panel roof systems are typically hydrokinetic, or water shedding, roof systems. They are designed to shed water rapidly over the surface of the panels, so the seams are not necessarily watertight. For the panel to shed water rapidly, the roof must have adequate slope. Architectural metal roof panel systems perform well on slopes of 3:12 (14 degrees) or greater. For lower slopes, climatic conditions must be carefully considered, particularly the amount of expected ice, snow, and debris accumulation, as sealant or sealant tape, such as butyl, may need to be used in the interlocking ribs. Architectural metal panel roof systems require continuous or closely spaced decking. A minimum underlayment of a No. 30 asphalt-saturated felt underlayment and separate slip sheet, such as rosin-sized sheathing paper or underlayment with slip sheet capabilities, is recommended. Metal panel manufacturers should be consulted for specific underlayment requirements. With architectural metal panel roof systems, an ice dam protection membrane is recommended where January mean temperature is 30 degrees Fahrenheit or less, or where building codes mandate. Also, for some types of metal, ventilation at the underside of the architectural metal panel may be necessary.”
Donan Engineering’s team of professional engineers has the knowledge and experience to successfully study architectural metal roof systems for proper installation, material defect, wear and tear, storm damage, and other potential causes of roof system failure.