Credits: 1 AIA/HSW; 0.1 IACET CEU*; 1 IIBEC CEH
Retrofit single-ply roof systems (RSPRS) are increasingly being used to re-cover existing structural metal panel roofs. Wind uplift resistance is of primary concern when a RSPRS is installed over a structural metal panel roof. To determine capacity, E1592 physical testing was performed on four test roof assemblies, each consisting of a mechanically attached TPO with flat stock and flute fill polyiso over a 24-inch wide structural metal panel roof system. Each RSPRS had different fastener patterns; the result was different wind uplift resistance values. The results from and an analysis of the four physical tests will be presented.
- Assess the load path for wind resistance of metal buildings, and identify the structural concerns when changing the load path.
- Discuss how fastener pattern is directly related to wind uplift resistance (based on large-scale physical testing).
- Define fastener spacing guidelines based on calculated loads and pullout values for a typical reroofing scenario.
- Recognize that our traditional assumptions about wind uplift resistance as it relates to tributary area are not necessarily correct.