238T

238T is a structural, symmetrical, mechanically seamed concealed-fastener standing seam roof panel from McElroy Metal. It is the taller of the two T-seam panels in the 138T and 238T pair, with a 2 3/8-inch symmetrical mechanical seam. McElroy lists it for metal-over-metal recover work.

The 238T sits among the McElroy panels that can be curved, with 138T, Maxima and Medallion I.

• Seam: 2 3/8-inch symmetrical mechanical seam, a T-seam with continuous factory-applied sealant past the clip location
• Panel widths: 16, 18 or 24 inches, depending on configuration; the 24-inch width is site-formed only
• Minimum slope: 1/2:12
• Substrate: solid deck or open framing
• Factory panel length: up to 80 feet, depending on the manufacturing facility
• Onsite forming: available

The 238T sheet draws striated, minor rib, plank and pencil (standard), flat and plank profiles, with seam engagement before and after seaming.

The T-seam allows a single panel to be replaced without disturbing the adjacent panels, and installation can start or stop anywhere on the roof. Factory sealant runs continuously past the clip. Major rib on center is not applicable to the T-seam panels.

The 238T standard panel is 24-gauge Galvalume. Coatings offered are Kynar 500 PVDF and, for unpainted use, acrylic-coated Galvalume Plus.

The 238T sheet includes an exploded assembly drawing. Component materials are:

• Stackable leveling shim: 6 inches by 6 inches by 1/4 inch thick
• Bearing plate: 24 gauge, ASTM A792 (50 ksi)
• Standard clip: 16 gauge, galvanized G90 ASTM A653 (50 ksi) as standard, or stainless 304SS ASTM A240 (50 ksi) as optional
• Retrofit clip: 16 gauge, with the same galvanized and stainless options
• Multi-span clip, two-piece: 24 gauge ASTM A792 (50 ksi) standard, 22 gauge optional, typically sold in 10-foot lengths
• Tall multi-span clip, two-piece: 24 gauge standard, 22 gauge optional, typically sold in 10-foot lengths

Tests and approvals listed across 238T and 138T are UL 263 Class A, UL 580 Class 90, UL 2218 Class 4, ASTM E1592, Florida Product Approval and Miami-Dade approval. Listed only for 238T: McElroy lists FM 4471, an ICC-ES listing, and TDI approval for steel 238T over plywood deck.

Its 1/2:12 minimum slope is lower than the 1:12 of 138T. The panel is one of the commercial standing seam metal roof systems.