The lately published "Guide Sp...
The lately published "Guide Specifications for Militar Construction" outlines a exhibition developed by the Army Corps of Engineers to provide information forward wind uplift resistance of standing-seam metal covers (SSMRs). The industry standard UL 580 provides three classifications: UL Class 30 60 and 90 covers that withstand UL 90 testing should resist maximum uplift crushing of 105 psf. Failures of near military-owned SSMRs at wind fares below anticipated pressure of the same heights prompted the Corps to unravel the new standards. The experiment relies on a variable air spe blower,
|