C21HD Clamp-on


No Set Screws

No Panel Penetration

Used on: Standing Seam Metal Roofs

• Available for all rib types including: Double Lock, Single Lock, Snap Lock, Skyline, etc

• Accepts 3/4” fence pipe

• Allows for full installation without any penetration of the roof surface

• Powder coated to match roofing material color

• 3/8” Dia X 1-3/4” or 2” carriage bolt (4)

• Ice Flags (recommended)

TRA Snow and Sun’s Clamp-on Snow Fence are recognized for their quality and strength.  We manufacture in the heart of the Rocky Mountains and design our systems to retain heavy snow loads.  You can be confident the snow on your roof will stay in place.  Our Clamp-on Snow Fence fits most standing seam profiles using a safe, reliable and attractive design. Our exclusive attachment system, using under-the-hem clamping and bolting, provides superior strength while maintaining your manufacturer’s warranty. Its attractive appearance and proven performance make TRA Snow and Sun’s Clamp-on Snow Fences ideal for both commercial and residential projects.  Our Clamp-on Snow Fences are available in a variety of materials and color/finishes which provide a system that matches your roof type. And we are pleased to say that they are manufactured in the USA.

Custom Designs and Engineering

At TRA Snow and Sun we engineer and lay out each project free of charge using many factors specific to your roof. We then provide you with the snow retention plan, layout and product detail. TRA Snow and Sun representatives will work with you to design the most efficient snow retention system. Fill out our Snow Retention Checklist to get started.

All Standing Seam Snow Fences have been tested from the fail point of the system.  The holding strength is proven in their performance.


Length: 9.67″

Width: 2″

Height: Varies based on seam profile


  • Copper: 1/4” (ASTM B152)
  • Stainless Steel: 8 gauge (ASTM A240)
  • Weathering Steel (known as CORTEN®): 1/4” (ASTM A588)
  • Zinc Coated Steel: 3/16” (ASTM A36)


  • Raw steel
  • Mill finish A588
  • Mill finish Copper
  • Mill finish Stainless Steel
  • Powder coating available in many colors

Product (Downloads)

Product Specification (.docx)