SymmeTry Roof Series, a New Revolutionary Symmetrical Panel
By Nathan P. Johnson
To meet the demands of stringent codes and offer high performance roofing systems, Morin,
A Kingspan Group Company, has introduced the SymmeTry Roof Series, a structural mechanically-seamed
roof system that is both symmetrical and hydrostatic by design.
The options and advantages of a symmetrical system over an asymmetrical system are many, and during the
next few years, symmetrical roof systems will revolutionize our industry.
Currently, there are only a handful of metal roofing manufacturers offering a symmetrical panel profile
and fewer with the technical know-how to provide solutions to difficult roofing problems. MORIN’s SymmeTry
Roof Series has four panel depths – more than other manufacturers – and three coverage widths, making it a
versatile system for architects, specifiers, roofing consultants, and installers.
A symmetrical metal roofing system does not “lap” over an adjacent panel like standard asymmetrical
panels. Symmetrical panels install side by side and have a mechanically seamed “cap” that has two
beads of continuous (without interruption by panel clip) butyl sealant, creating the most watertight
seam of all metal panel types. MORIN’s SymmeTry Roof Series vertical panel legs range from 1-1/2
inches to 3 inches in height.
The SymmeTry Roof Series panels, by design, are bidirectional, meaning they can be installed going
left to right, right to left, or start from any point of the roof.
In the event a panel needs to be replaced because it’s damaged, or large penetrations need to be
added after the installation, panel replacement is easier and less expensive with a symmetrical panel.
Building owners only have to replace the panel or panels affected by damage or new penetrations and
install a new seam cap.
Symmetrical panels are specified and installed to allow for unlimited thermal expansion and
contraction, providing the advantage of installing panels up to 300 feet in length. The clips
are fixed and the panels move up and down the slope engaging on the clips rather than the clips
sliding and running out of expansion capacity. These panels can be formed onsite. By eliminating
end laps and ensuring a proper installation by qualified installers, leaks are greatly reduced
and/or completely eliminated.
More Savings Benefits
Because a symmetrical roofing system installs easier, it is ideal for roofs with complex geometry.
It’s also an optimal system to install when an existing roof needs to be recovered; the space between
the existing roof and the new symmetrical panels can be filled with insulation, thus increasing the
The clips used for a symmetrical roof system have a 3/8-inch offset. This allows for airflow between
the panels and the existing roof -- reducing heat transfer significantly and lowering the overall
temperature of the roof envelope.
In a recover application, the installation of a symmetrical system eliminates the growing cost of tear-off
In a remove and replace application, the savings of using a symmetrical system can be tremendous. In a
90,000-square-foot building, to meet the updated wind uplift requirements in many regions with a new roof,
you would be required to add as much as 10,000 lineal feet of additional purlins to the structure when
using an asymmetrical standing seam system. With the wind uplift capabilities of the symmetrical system,
you would not have to add any.
Simply, at the end of the day, it’s the lowest cost of ownership.
Each manufacturer of symmetrical standing seam roof systems will have its panels tested.
The SymmeTry Roof Series from MORIN has undergone or is undergoing a wide variety of tests
that will allow for its installation anywhere, including where the strictest wind uplift codes
and wind driven rain requirements are in place
MORIN’s taller panels (2-1/2- and 3-inch legs) will meet requirements for installation at very low
slopes. It will meet ASTM E-1680 air infiltration, ASTM E-1646 water infiltration and ASTM E-2140
static water pressure requirements, which means the panel can be flooded and it won’t leak.
The SymmeTry Roof Series system is undergoing (and expected to meet the requirements of):
In past years, everyone was specifying and installing the snap-lock standing seam system. Then codes
got stricter and everyone migrated to a 2-inch single- or double-lock standing seam roof system. There
will be a move to symmetrical roof systems over an asymmetrical system simply because of the significant
wind uplift capacities. The symmetrical roof systems have greater wind uplift capabilities than any
asymmetrical panel system. Symmetrical roofing systems could be a game-changer in the industry,
especially where Miami-Dade Code approvals and Florida Product Approvals are required.
- ASTM E-1592 Uplift Test
- UL 580 and UL 1897 Wind Uplift Test
- UL Class A Fire Rating
- UL Class 4 Impact Resistance
- FM 4471 Open Framing Uplift Test
- FM 4471 Over Metal Deck Uplift Test
- ASTM E-1680 Air Infiltration Test
- ASTM E-1646 Water Infiltration Test
- ASTM E-2140 Static Water Pressure
- FM Class 1-SH Impact Resistance Test
- Florida Products Approval
- Texas Windstorm
For more information visit www.morincorp.com.
About the author: Nathan P. Johnson’s background is in architectural metal wall cladding and roof
systems. His experience comes from serving in positions for several major manufactures, such as
Regional Manager, Territory Manager, General Manager, and Sales Manager for a major manufacturer.
Johnson is a skilled technical advisor to architects, specifiers, and building envelope consultants.
With more than 17 years of experience, he is able to navigate effectively, at every level, within
small and large companies, discerning their needs and guiding them to the right solution for their
projects, ensuring proper material selection as well as the appropriate architectural profile,
culminating in successful projects and satisfied clients.
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