Maxima

Maxima is a mechanically seamed, concealed-fastener standing seam roof system from McElroy Metal, offered in several seam configurations. The McElroy page lists four profiles: Maxima 1.5, Maxima 2, Maxima ADV and Maxima 324. This article centers on the Maxima 2-inch panel covered by the product data sheet.

Leg heights run from 1 1/2 inches to 3 inches, and pan widths from 12 inches to 24 inches. Maxima is among the McElroy systems that can be curved, with 138T, 238T and Medallion I.

• Rib heights: 1 1/2, 2 and 3 inches
• 2 and ADV major rib on center and cover widths: 12, 16 and 18 inches
• 3-inch major rib on center and cover widths: 18 and 24 inches
• Minimum slope: 1:12 for the 1.5-inch rib, 1/2:12 for the 2-inch rib, 1/4:12 for the 3-inch rib
• Factory panel length: up to 70 feet, depending on the manufacturing facility
• Onsite forming: available
• Substrate: solid deck or open framing

The 2-inch data sheet draws a striated profile as the standard, a bead (pencil rib) profile as an option and a flat pan profile as an option. A 90-degree seam is drawn before and after seaming.

• 1.5 inch: striated and flat
• ADV: striated, flat and pencil ribs
• 2 inch: striated, flat and double pencil rib
• 3 inch: striated, 3:18 minor rib and 3:24 minor rib

The standard material is 24-gauge Galvalume. 22-gauge Galvalume is available, as are .032 and .040 aluminum. The finish is Kynar 500 PVDF. Color charts are published separately.

Clips and accessories in the Maxima 2-inch sheet are given with their materials. Clips are offered in galvanized G90 (ASTM A653, 50 ksi) and in stainless steel (ASTM A666, 50 ksi), at 22 gauge.

• Low floating clip, two-piece: 22-gauge clip on a 16-gauge galvanized G90 base
• High floating clip, two-piece: 22-gauge clip on a 16-gauge galvanized G90 base
• Low fixed, high fixed and utility fixed clips: 22 gauge
• Outside closure: 24-gauge ASTM A792, for 16-inch and 18-inch panels
• Bearing plate: 16 gauge, red primed ASTM A1011 (55 ksi) or galvanized ASTM A653 (55 ksi)
• Thermal spacer
• Back-up plate: 16-gauge galvanized, for 16-inch or 18-inch panels only
• Back-up channel: 16-gauge galvanized, for 12-inch, 16-inch or 18-inch panels
• Cinch strap: 16-gauge stainless steel ASTM A666, for 16-inch or 18-inch panels
• Architectural zee closure: 26-gauge ASTM A792, field cut to form outside closures for 12-inch, 16-inch and 18-inch panels

The Maxima system uses these clip types: low floating, low fixed, high floating, high fixed and utility fixed.

Listed tests and approvals are UL 263 Class A, UL 580 Class 90, UL 2218 Class 4, ASTM E1592, ASTM E1680 and E1646, and Florida Product Approval. FM 4471 applies to the 2-inch and 3-inch panels only. TDI approval applies to ADV only, over plywood or metal deck and open framing. Miami-Dade approval applies to the 2-inch by 16-inch panel only, and the ICC-ES listing to the 2-inch panel only.

Maxima is the McElroy standing seam line with the widest range of seam heights. It belongs with the commercial standing seam metal roofing systems.