138T

138T is a symmetrical, mechanically seamed, concealed-fastener standing seam roof panel from McElroy Metal. It has a 1 3/8-inch symmetrical mechanical seam and is the lower-seam member of the 138T and 238T pair. McElroy lists it for metal-over-shingle recover work.

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

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

Profiles drawn are striated, minor ribs, plank and pencil (standard), flat and plank. Seam engagement is drawn before and after seaming, with an exploded assembly and a closure. Additional lengths for hips are available.

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.

On 138T the standard panel is 24-gauge Galvalume, finished in Kynar 500 PVDF or acrylic-coated Galvalume Plus. The closure is 24-gauge ASTM A792 (50 ksi).

The coatings are Kynar 500 PVDF and, for unpainted use, acrylic-coated Galvalume Plus. Color options are published in a color chart.

• Stackable leveling shim, 6 inches by 6 inches and 1/4 inch thick
• Bearing plate in 24-gauge ASTM A792 (50 ksi)
• Standard clip, 16 gauge, galvanized G90 ASTM A635 (50 ksi) or stainless 304SS ASTM A240 (50 ksi)
• Shingle recover (ASV) 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
• Vented eave and ridge trim for 138T: 0.063 aluminum, ASTM B209 3003

The 138T carries the same pair-wide listings as 238T: UL 263 Class A, UL 580 Class 90, UL 2218 Class 4, ASTM E1592, Florida Product Approval and Miami-Dade approval. Its own listing is TDI approval for aluminum 138T over plywood deck.

The shingle recover clip and the 1:12 minimum slope distinguish it from 238T. It sits among the commercial standing seam metal roofing panels.