Max-Rib

Max-Rib is an exposed-fastener metal panel used for roofing and siding. Its low-profile ribs distinguish it from standing-seam systems. Confirm panel gauge, finish, support conditions and fastening from the project-specific submittal.

Record scope

This page is the product-level record for Max-Rib. It separates this product from similar lines, variants and generations so that specifications and data sheets can be checked against the correct identity.

• Product family: Metal roof panels
• Recorded applications: Commercial metal roofing
• Market: United States
• Manufacturer: McElroy Metal

Key recorded details

These values summarize reviewed manufacturer information. Use the linked source for tolerances, options, exclusions and complete assembly requirements.

• Product family: Metal roof panels
• Application: Commercial metal roofing
• Attachment: Exposed fasteners
• Minimum slope in linked sheet: 1:12; tape sealant required at side laps from 3:12 to 1:12
• Minimum roof slope: 1:12
• Side-lap sealant condition: Tape sealant required from 3:12 down to 1:12
• Standard panel length: Up to 40 feet; longer lengths by inquiry
• Standard substrate: 29 ga ASTM A792 steel
• Optional gauges: 24 ga or 26 ga ASTM A792 steel
• Roof uplift classification: UL 580 Class 90
• Impact classification: UL 2218 Class 4
• Fire classification: UL 263 and UL 790 Class A
• Texas Windstorm listing: RC-157

Matched current documents

The following current files are connected directly to this product record. Older revisions remain in the archive when moderators retire them.

• Max-Rib product data

Design and specification coordination

Use these checks to connect the product record to a complete, project-specific assembly. The manufacturer documents and approved construction documents govern where they provide more specific requirements.

• Confirm panel profile, coverage width, seam or rib geometry, metal type, gauge or thickness and finish.
• Coordinate minimum slope, substrate, underlayment, clip or fastener selection and allowance for thermal movement.
• Verify perimeter, ridge, valley, transition, penetration and closure details with the selected panel configuration.
• Check tested wind-uplift, fire, water and air assemblies against deck type, span and attachment spacing.
• Record manufacturing length limits, field-seaming requirements, finish availability and protection during storage and handling.

Submittal and field verification

A useful product record should allow a reviewer to trace what was specified, approved, delivered and installed. Include the following items when this product is proposed or verified.

• Use the exact product name and manufacturer identifier on the submittal; do not substitute a similar family name.
• Attach the current product data sheet and the applicable installation, safety, approval and warranty documents.
• Record selected options such as size, thickness, profile, color, finish, reinforcement and attachment method.
• Identify the tested or approved assembly and list each adjoining component needed to reproduce it.
• At delivery, compare labels and revision dates with the approved record and archive superseded files instead of overwriting them.

Selection, installation and existing-roof checks

Confirm the exact product name, generation and configuration before using any value on this page. Check the roof substrate, slope, attachment or adhesive, reinforcement, edge and penetration details, accessories, tested assembly and local approval that apply to the project. For an existing roof, compare labels, package records, original submittals and physical dimensions; appearance alone is not enough to identify a product.

Recorded applications

• Commercial metal roofing

Record scope

• Product family: Metal roof panels
• Recorded market: United States
• Product code: Max-Rib

• Product family: Metal roof panels (United States; Source checked September 19, 2026)
• Application: Commercial metal roofing (United States; Source checked September 19, 2026)
• Attachment: Exposed fasteners (United States; Source checked September 19, 2026)
• Minimum slope in linked sheet: 1:12; tape sealant required at side laps from 3:12 to 1:12 (United States; Source checked September 19, 2026)
• Minimum roof slope: 1:12 (United States; Source checked September 19, 2026)
• Side-lap sealant condition: Tape sealant required from 3:12 down to 1:12 (United States; Source checked September 19, 2026)
• Standard panel length: Up to 40 feet; longer lengths by inquiry (United States; Source checked September 19, 2026)
• Standard substrate: 29 ga ASTM A792 steel (United States; Source checked September 19, 2026)
• Optional gauges: 24 ga or 26 ga ASTM A792 steel (United States; Source checked September 19, 2026)
• Roof uplift classification: UL 580 Class 90 (United States; Source checked September 19, 2026)
• Impact classification: UL 2218 Class 4 (United States; Source checked September 19, 2026)
• Fire classification: UL 263 and UL 790 Class A (United States; Source checked September 19, 2026)
• Texas Windstorm listing: RC-157 (United States; Source checked September 19, 2026)

Official technical information

Use the individual manufacturer document for the selected configuration. Check its revision and the complete assembly requirements before specification or installation.

• Max-Rib product data
• Official product details

Market: United States · Effective: Source checked September 19, 2026

Verify this information with the manufacturer source

Check packaging, product labels and original project submittals against the exact product name and document revision. The representative application photograph does not establish product identity.

Compatibility considerations

Verify the substrate, attachment, adjoining materials and accessories against the manufacturer’s complete assembly instructions. A shared brand or similar appearance does not establish interchangeability.

• Official McElroy Metal Max-Rib product resource