Recognizing how a safety factor is included in the approval listing is critical to ensuring an appropriate roof system is selected and installed. Roof systems that have the tested capacity to resist calculated wind loads can be found in approval listings (e.g., UL, FM). Understanding the similarities and differences between the three versions of ASCE 7 provides for better recognition of the current version's complexity and allows for more appropriate wind load determination. The progression of ASCE 7 during the last two decades had added complexity to what was once a relatively straight-forward calculation. The three versions that are currently in use are ASCE 7-05, 7-10, and 7-16, with the "-xx" representing the year of publication. Different editions of building codes exist, and therefore, different versions of ASCE 7 are being used in different parts of the country. And with the latest version of ASCE 7, "Minimum Design Loads For Buildings and Other Structures" (ASCE 7), it has become that much more challenging for roof system designers and roofing contractors. Wind design of roof systems is one of the more complicated things that an architect deals with during the design of a building.
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