Standing Seam Metal Roofing Systems

Standing seam metal roofing panels are secured using hidden fasteners. Initially, clips were used to attach the panel to the roofing structure by connecting with the vertical legs. However, as panel options have expanded, clipless panels are now commonly available within this product range.

At Xinhonghua Machinery, we provide five distinct standing seam systems that can be curved on-site, reducing transportation expenses and ensuring an accurate installation.

Standing Seam Metal Roofing Systems Overview

Product Families

Standing Seam Metal Roofing Systems are commonly applied to roofs with lower slopes, sometimes as low as ΒΌ:12. They are classified as hydrostatic, which ensures that they remain watertight even when temporarily submerged underwater. These products are suitable for use in both open framing and solid deck applications.


These systems are frequently employed on slopes with a pitch of 3:12 or steeper. They are classified as hydrokinetic, meaning they have the ability to keep buildings watertight even when water is flowing over them, as opposed to structural systems which can withstand water submersion. Some panel styles within this category possess load carrying capacity, while others do not.

Engagement Method


Snapped panel systems utilize a male and female leg configuration. When the legs are correctly aligned, pressure is applied, causing the panels to snap together and complete the installation process.

Mechanically Seamed

Mechanically seamed systems require the use of a powered seaming machine after panel installation to ensure proper performance.

Attachment Method


Clipless standing systems are secured by fastening them through a pre-punched fastening flange. These flanges typically feature repeating slots spaced every 2-4 inches, which make it easier to attach them to the roofing deck, commonly made of 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.

Panel Styles


Although trapezoidal panels are the most budget-friendly option for standing seam panels, their large trapezoidal shape limits their popularity in high-profile architectural projects or in areas with valley conditions.

Vertical Leg – Non Symmetrical

Vertical leg panels, as the name suggests, feature a vertical leg where the male and female legs connect. These types of panels can either be snapped together or mechanically seamed for installation.

T Panel – Symmetrical Standing Seam

T-style panels offer a combination of aesthetic appeal and functionality by incorporating a vertical leg design along with a separate batten cap that is securely fastened in place through mechanical seaming. The advantage of these panels is that they enable convenient removal and replacement of individual panels within the roof field.

Installation Approach


Symmetrical panels have identical vertical legs, allowing each panel to be replaced individually even after installation, thus removing a longstanding challenge faced by the industry. The panels also offer contractors greater flexibility during installation as they can begin at any point, or even install multiple panels simultaneously if needed.


The legs for non-symmetrical panels are different. This feature requires non-symmetrical panels to be installed progressively, typically left to right. Consequently, non-symmetrical systems can require the removal of unaffected panels during building repairs or modifications.

Curved Roofing

Curvatures are in high demand! McElroy Metal provides a range of five unique standing seam systems that can be conveniently curved directly on the job site. This innovative feature reduces transportation costs and guarantees a precise fit. The standing seam systems that can be curved include Maxima 1.5, Maxima ADV, 138T, 238T, and Medallion I, ensuring a variety of options to meet different project requirements.

Standing Seam Roofing Systems

Standing seam systems offer diverse applications and are commonly used in various projects. These systems have interlocking seams that connect panels, resulting in an appealing and distinguishable roof design. Moreover, standing seam systems are made from premium-quality steel or aluminum, providing several years of hassle-free service life with minimal required maintenance.

Xinhonghua Machinery standing seam systems are durable and weathertight, making them ideal for most any application.