{"id":168,"date":"2018-10-18T15:51:28","date_gmt":"2018-10-18T15:51:28","guid":{"rendered":"https:\/\/www.advaluminum.com\/blog\/?page_id=168"},"modified":"2018-10-19T06:05:33","modified_gmt":"2018-10-19T06:05:33","slug":"how-are-wind-uplift-ratings-determined","status":"publish","type":"page","link":"https:\/\/www.advaluminum.com\/blog\/how-are-wind-uplift-ratings-determined\/","title":{"rendered":"How Are Wind Uplift Ratings Determined?"},"content":{"rendered":"

The cost of a roof system<\/a> is affected by the wind design, but how are wind uplift ratings determined? A balance should be achieved so that the cost to prevent blow-off isn\u2019t unnecessarily high while the wind-resistance capacity is sufficient for a roof to stay intact according to the appropriate wind-related classification. If actual wind load exceeds the wind-resistance capacity of a roof system, the roof may not be considered wind-resistant. The following provides insights for the layperson as to how wind uplift ratings are determined.<\/p>\n

Wind Uplift Defined<\/h2>\n

The suction that wind create as air moves parallel to the surface of a roof is called wind uplift. A pressure differential is created when a gust of wind meets the side of a building and part of the air is directed upward and then across the roof. The air pressure on top of the roof is less than the air pressure below. As the differential tries to equalize, a suction is created that pulls at the panels of the roof. The uplift is more forceful in faster wind. Wind uplift can pull shingles and panels off of a structure in extreme wind events.<\/p>\n

\"MetalBuilding Calculations<\/h2>\n

Before a wind uplift rating can be determined, certain building calculations must be gathered. All of the following criteria below is factored in.<\/p>\n