Medallion-Lok

Medallion-Lok is a snap-together standing-seam metal roof panel with concealed attachment. The official product data describes profile options and material configurations. Identify the seam and panel width before selecting replacement panels or adjoining flashings.

Record scope

This page is the product-level record for Medallion-Lok. 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
• Panel type: Concealed-fastener snap-lock standing seam
• Seam height: 1 3/4 inches
• Cover widths: 12, 16, or 18 inches
• Standard substrate: 24 ga Galvalume steel
• Installation base: Solid deck or open framing
• Minimum roof slope: 3:12
• Standard finish: Kynar 500 PVDF
• Panel configurations: Striated, ribbed, or flat pan
• Standard maximum length: 50 feet in the matched product data; verify facility-specific limits
• Impact classification: UL 2218 Class 4

Matched current documents

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

• Medallion-Lok 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: Medallion-Lok

• Product family: Metal roof panels (United States; Source checked September 19, 2026)
• Application: Commercial metal roofing (United States; Source checked September 19, 2026)
• Panel type: Concealed-fastener snap-lock standing seam (United States; Source checked September 19, 2026)
• Seam height: 1 3/4 inches (United States; Source checked September 19, 2026)
• Cover widths: 12, 16, or 18 inches (United States; Source checked September 19, 2026)
• Standard substrate: 24 ga Galvalume steel (United States; Source checked September 19, 2026)
• Installation base: Solid deck or open framing (United States; Source checked September 19, 2026)
• Minimum roof slope: 3:12 (United States; Source checked September 19, 2026)
• Standard finish: Kynar 500 PVDF (United States; Source checked September 19, 2026)
• Panel configurations: Striated, ribbed, or flat pan (United States; Source checked September 19, 2026)
• Standard maximum length: 50 feet in the matched product data; verify facility-specific limits (United States; Source checked September 19, 2026)
• Impact classification: UL 2218 Class 4 (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.

• Medallion-Lok 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 Medallion-Lok product resource