26 September 2006
On Army and Air Force projects, panel clip spacing must be a maximum of 1525 mm (5
ft.) on-center in the field and 760 mm (30 in.) on-center in the wind zone on the edge
Construction should replicate tested assembly with respect to clip type, gauge, spacing,
and attachment. This test is typically conducted over heavy gauge purlins; if the
construction assembly uses a structural deck and rigid insulation rather than purlins, pull
testing of clips may be necessary to verify adequacy of attachment.
Specify a comprehensive, single source manufacturer warranty. The warranty terms,
exclusions, and limits must be enumerated in the specifications. Good watertight
warrantees generally add some additional cost to the project since most roof
manufacturers will inspect the work one or more times during construction as a
condition of the warranty. For additional information on warrantees refer to Appendix D.
STM TEST METHOD.
The test method for hydrostatic joint performance is ASTM E2140-01, Standard Test
Method for Water Penetration of Metal Roof Panel Systems by Static Water Pressure
Head. The test normally tests only the panel side and end-joints, but it can be adapted
to test other assemblies also. In addition to the standard standing seam testing, test the
eave of the metal roof system.
METAL ROOFING SPECIFICATIONS.
Use the UFGS instead of the specifications shown in the MBMA Manual or the NRCA
RECOMMENDED METAL ROOFING CONSTRUCTION DETAILS.
Regardless of actual project slope, use the "Vertical Rib Low Slope Details" (2-1 through
2-30) in the MBMA Manual, as applicable. Do not use NRCA or SMACNA details for