Mechanical-Lock Standing Seam Panel Guide

Mechanical-lock standing seam panels are supplied with open seams that are locked in the field after the panels are installed. Selecting the correct panel system depends on the approved roof design, manufacturer requirements, slope, substrate, details, and installation plan.

MidAtlantic Mechanical-Lock Panel Options

MidAtlantic Metal Systems forms 1-inch mechanical-lock panels in two finished widths:

• 17-inch finished width from 20-inch coil
• 21-inch finished width from 24-inch coil

Our standard materials are Englert 24ga and 26ga steel. Aluminum and other special-metal requests are reviewed and quoted case by case, subject to material, profile, tooling, lead-time, and warranty availability.

Mechanical Lock vs. Snap Lock

A mechanical-lock panel is installed with an open seam and then field-seamed with the appropriate hand or powered seaming equipment. It is not delivered as a pre-seamed panel. Our separate 1.5-inch snap-lock system is offered in 16- and 20-inch finished widths.

The contractor, project designer or engineer, and manufacturer must determine which system is appropriate for the project. MidAtlantic Metal Systems does not select a roof assembly, provide engineering, or guarantee code approval.

Plan the Field-Seaming Work

Before ordering mechanical-lock panels, confirm the required seaming method, compatible equipment, installer responsibility, sequencing, and access. The installation crew should follow the approved manufacturer instructions and project documents.

• Confirm the exact panel profile and approved seam configuration.
• Coordinate the seamer and trained operator with the installation schedule.
• Protect stored panels and keep seams clean before locking.
• Confirm clips, fasteners, trim, and flashing against the approved details.

Cut-and-Drop or On-Site Roll Forming

Panels can be prepared for shop pickup or coordinated jobsite delivery from an approved cut list. On-site roll forming may be available for qualifying projects, subject to panel length, approved measurements, jobsite access, setup space, project location, material availability, and scheduling.

On-site forming changes where the panels are produced; it does not remove the need for approved dimensions, an exact panel schedule, proper handling, or field seaming by the installation crew.

Warranty and Product Documentation

Warranty availability and terms depend on the specific material, coating, manufacturer requirements, approved assembly, installation, project conditions, and documentation. A general article cannot promise a particular warranty term. Confirm any requested warranty or technical documentation before ordering.

What to Send for Pricing

Send the mechanical-lock finished width, 24ga or 26ga steel, Englert color or Galvalume, exact panel lengths and quantities, trim and accessory list, jobsite address, target date, and pickup, delivery, or qualifying on-site preference.

Review all current panel specifications, or request contractor material pricing.