Specifications
Air pressure tests are a more reliable means of measuring the resistance of sheet metal roofing to negative pressure than computations alone. With careful attention to the metal roofing performance specifications and submittal review process, the potential liability involved with roof failures can be greatly reduced.
Todd Beasley is President and CEO of Architectural Metal Products, Inc. In-house seminars on metal roofing systems are available, and will earn two Learning Units toward the AIA-CES program. Call (808)528-1790 to schedule.
References
Richard C. Schroter, P.E., CSI, CDT,
Simpson Gumpertz & Heger, Inc.
Schroter, R.C.,
“Air Pressure Testing of Sheet Metal Roofing,”
NRCA Second International Journal of Roofing Technology.
Schroter, R.C.,
“What's the Status of Metal Roofing certification?”.
Schroter, R.C.,
“The Load Path”.
Decker, R.C.,
“Roof Failures Pose Industry Alert”.
The Military Engineer, No. 531 Sept./Oct. 1989).
ASTM E-1592. Standard Test Method for Structural Performance of Sheet Metal Roof and Siding Systems by Uniform Static Air Pressure Difference.
American Society for Testing and Materials, 1916 Race St., Philadelphia, PA 19103.
1994 Uniform Building Code
Chapter 16 Division II 1613-1615 - Wind Design
AISI Cold-Formed Steel Design Manual.
American Iron and Steel Institute, 1101 17th St.
N.W., Washington D.C. 10036-4700.
Specifications for Aluminum Structures.
Aluminum Association, 900 19th St. N.W.,
Washington D.C. 10006
Performance Criteria:
1. Provide wind uplift resistance in accordance with the 1994 Uniform Building Code.
2. Structural capacity of metal roofing system shall be determined in accordance with ASTM E 1592-95. A minimum of two tested spans are required in order to interpolate allowable load data between tested spans. Extrapolation of data outside the tested spans is not allowed. Test report shall clearly state allowable loads and factor of safety used (minimum 1.65).
3. Provide a design analysis signed by a registered Professional Engineer, confirming that the structural capacity of the metal roofing system, as determined in accordance with ASTM E 1592-95, is adequate to resist the design loads required by the 1994 UBC. Analysis should include calculations verifying the design load and the uplift pressures. Provide a roof plan with the perimeter areas of discontinuity and field areas with associated pressures.
Last updated:
©2000-2003 Architectural Metal Products
Questions? Call 1-800-267-1296