Standing Seam Metal Roofing Products

Snapped panel systems consist of a male and female leg. Once the legs are properly engaged, pressure is applied and the panels snap together to complete the installation sequence.

This family of panels may also have a male and female leg that are “hooked” during installation; however, in T Style systems, the panels are connected only through the clip and a seam cap is applied over the connection. Once the job is complete a powered seaming machine is run along the entire length of the seam to make the system weather tight and complete the installation.

Clipless standing systems are fastened through a pre-punched nailing flange. These flanges typically have repeating slots every 2-4” to facilitate attachment to the roofing deck, most often plywood.

Clipped systems consist of a clip that is integrated into the male/female panel legs and is then attached to the deck or purlins.

These panels were the original standing seam panels in the industry.  As the name implies, when they are installed there is a trapezoidal opening at the eave and ridge.  The trapezoidal opening receives an inside closure and tape sealant to make the condition water tight. These panels are the most cost effective standing seam option; however, due to the trapezoidal area after installation, they aren’t widely used in architectural applications nor those with high visibility.  Instead, trapezoidal systems are best suited for simple buildings such as those without valleys.  They are often available in both snap and machine seamed versions and generally install from left to right.

As the name implies, vertical leg panels have a vertical leg at the connection of the male/female leg, normally close to 90 degree. The systems typically install from left to right and often require the use of a seaming machine.

T style panels are one of the newer industry advancements. They combine the look and functionality of a vertical leg and have a batten cap that is then mechanically seamed in place. These panels allow for the easy removal and replacement of a panel in the field of the roof. This is a huge benefit that has been sorely needed in the industry. Consequently, they are quickly gaining favor as the preferred panel style.

As the name implies, symmetrical panels look the same on both sides of the panel legs. While this might seem a minor difference, the impact is major. Symmetrical panels do not require left to right or right to left install. Instead installers can start at any (or multiple) points on the roof. Challenging areas can be skipped and returned to later. Symmetrical systems also allow for individual panel replaceability and in many cases allow for the original panels to be re-installed once the building modifications are completed. This feature is long overdue in the industry and carries obvious benefits to repair panels damaged by storms or to address issues common during building expansion or re-purpose.

The legs on the left and right of the panel are different for non-symmetrical panels. This requires that non-symmetrical panels always be installed in a progressive fashion, typically left to right. While not a huge differentiator during initial construction, should the roof ever require modification for new HVAC venting etc. or repairs, non-symmetrical systems can require that panels be removed from the roof back to the affected area. The original panels cannot be reinstalled so new panels must be purchased and installed to complete the remediation.

Curves are in! Design professionals appreciate curved metal roofing and the way curves transform the curb-appeal of structures. Curved metal roofing is popular as design accents or entire roofs. McElroy Metal offers five distinct standing seam systems that can be curved right on the job site, which lowers transportation cost and ensures a proper fit. McElroy's standing seam systems that can be curved are Maxima 1.5, Maxima ADV, 138T, 238T, and Medallion I.