In order to pass the standards, these panels were subjected to testing with regard to its strength and safety as well as the roll forming quality and practices at Graber Post.
What does the UL Classification mean to the end user of our product? The end user of these roofing panels, whether it’s a homeowner or contractor, may qualify for additional discounts on their insurance policies.
Underwriters Laboratories Underwriters Laboratories is a nonprofit product safety testing and certification agency. UL standards have been developed and standardized to provide a universal standard in which manufacturers and consumers can gauge the safety and performance of a specific product. UL standards are recognized worldwide in many industries including the roofing industry.
Both 26 gauge and 29 gauge in the G-Rib and R-panel #1 metal roof decking manufactured at Graber Post Buildings, Inc. have been tested and met, or exceeded, the UL requirements for the following standards:
Up-lift Resistance: Standard UL 580 provides testing in regards to the amount of up-lift resistance a roof decking panel can withstand while it is properly attached to a roofing structure.** Roof decking that passes the testing criteria will be listed as either “Class 15,” “Class 30,” “Class 60,” or “Class 90.” A “Class 15” rating represents nominal, static uplift-pressure resistance of 15 pounds per square foot while a “Class 90” rating represents nominal, uplift-pressure resistance of 90 pounds per square foot. The classified metal roof deck panels manufactured (roll formed) by Graber Post Buildings, Inc. are all classified as “Class 90.”*
Impact Resistance: Standard UL 2218 provides testing in regards to impact resistance by performing tests that simulate impact similar to impact a roof decking panel might experience during the course of a hail storm or other impact. All metal roof decking material that is classified as to impact resistance will be rated as “Class 1,” “Class 2,” “Class 3,” or “Class 4.” This test involves dropping steel balls of various weights from different heights. These balls are also dropped in areas that might be considered the most vulnerable to impact damage such as corners and edges. In order to obtain a “Class 1” rating a material must be able to show damage resistance to one and one-quarter inch steel ball dropped from twelve feet. A “Class 4”classification can be attained if the material shows resistance to a two inch ball dropped from twenty feet. The classified metal roof deck panels manufactured (roll formed) by Graber Post Buildings, Inc. are all classified as “Class 4.”*
As to External Fire Exposure: Standard UL 790 provides testing in regards to the ability of roof decking to withstand external fire. In order to be classified material must show resistance to fire, resistance to slipping, and resistance to producing fire ambers. The classified metal roof deck panels manufactured (roll formed) by Graber Post Buildings, Inc. are all classified as to external fire exposure.*
*please see appropriate manufacturer’s UL Certificate and UL Directories for additional information.
**please request additional information for proper attachment methods for roofing material if unsure.
Whole steel coils that are not roll formed by Graber Post Buildings, Inc. will not qualify as UL Classified.
Impact, fire, and up-lift resistance classifications are a measure of the materials ability to resist damage and do not imply additional warranties. You must review manufacturer’s warranty certificates for complete warranty inclusions/exclusions.
Graber Post Buildings is a multi-faceted building materials company, owned and founded by Glen S. Graber. Graber Post Buildings manufactures and sells metal, metal trims, metal roofing products, custom trusses, and other post frame products and accessories to customers in more than 22 states for residential, commercial, agricultural, and recreational applications. We offer made to order building kits for do-it-yourselfers that can be picked up or delivered, and we also employ approximately 22 construction crews to provide a total turn key construction project.
Graber Post Buildings is located between Montgomery and Odon, Indiana, in rural Daviess County.