IW Series: IW-40A

The IW-40A is a 12 inch wide concealed fastener panel with an 11 inch flat and a 1 inch recess. The IW-40A is the fourth profile of the IW Series, which also includes the IW-10A, IW-13A and IW-20A. The IW-40A is a concealed fastener metal wall panel that is used as horizontal or vertical rainscreen cladding on commercial and industrial buildings.

• Coverage: 12 inches (305 mm).
• Panel height: 1.50 inches (38 mm).
• Profile: one inch (25 mm) reveal-joint with a raised flat pan.
• Flat: 11 inches; recess: 1 inch.
• Panel length runs from 5 feet to 25 feet; other lengths are special orders.

The common lock joint of the series is part of the IW-40A. It minimizes moisture intrusion, hides the fasteners and lets IW-40A panels be combined with other IW profiles. A factory-installed sealant in the side joint of the IW-40A helps minimize water intrusion.

The IW-40A uses the series face sheet: coil-coated steel to ASTM A 755/A 755M on G90 zinc-coated base metal. Nominal uncoated thickness options run from 0.030 inch (22 gage) to 0.047 inch (18 gage). Sheet is non-directional embossed or unembossed.

Installed over insulated composite backup panels, the IW Series assembly is rated at a maximum 0.06 cfm/sq. ft. (0.3 L/s per sq. m) air infiltration per ASTM E 283 at 1.57 lb/sq. ft. (75 Pa), with no uncontrolled water penetration per ASTM E 331 at 6.24 lb/sq. ft. (299 Pa), on a test panel of at least 10 by 10 feet that includes side joints. Wall panel assemblies are limited to L/180 deflection under scheduled wind pressure. The load span table for the IW-40A is published as a separate file.

The IW-40A data are given under 2012 MasterFormat Section 07 42 13.19, with load span tables based on Allowable Stress Design (ASD). ASCE 7-10 (LRFD) loads are converted to ASD combinations using section 2.4.1 of ASCE 7-10. Where foam plastic insulation is part of the wall system, the system is tested by the foam plastic supplier in accordance with NFPA-285.