Built to Last

Award-Winning Commercial Roofing

Duerson Corporation’s precision and problem-solving earned the Duro-Last Project of the Year Award for this complex installation at Grinnell Mutual’s headquarters.

See What We Can Do for Your Roof
Gold circular badge with "Chairman Award" text in the center, surrounded by laurel wreaths. "Duro-Last 2024" appears at the bottom.
Aerial view of a large school complex surrounded by green lawns and parking lots. The building features multiple connected sections with beige roofs. Cars are parked in designated areas, and fields stretch into the distance under a clear sky.

GRINNELL MUTUAL

Location: Grinnell, Iowa

Industry: Insurance

Facility Type: Commercial Headquarters

Roof Area: 187,000 square feet

 

Challenges:
  • Emergency replacement was needed due to a hailstorm
Services Provided:
  • Full Duro-Last replacement
  • Custom installation across complex
Award:
  • 2024 Duro-Last Project of the Year
Gold circular badge with "Chairman Award" text in the center, surrounded by laurel wreaths. "Duro-Last 2024" appears at the bottom.

Precision Planning, Lasting Results 

Aerial view of a large, single-story brick building with a tan flat roof, surrounded by green lawns and a few trees. A red car is parked in the driveway near the entrance. The background shows open fields under a clear sky.

Duerson Corporation delivered a custom roofing solution by: 
  • Removing the hail damaged roof
  • Installing a prefabricated Duro-Last membrane
  • Coordinating around ongoing operations to minimize disruption
  • Delivering flawless detailing on a highly complex layout
  • Securing warranty protection through manufacturer-approved installation practices

Precision Roofing Materials Built to Perform

This award-winning installation featured a complete Duro-Last commercial roofing system tailored to the unique needs of Grinnell Mutual’s headquarters.

  • Duro-Last PVC Membrane
    A prefabricated, reflective membrane designed for energy efficiency, durability, and watertight protection.
  • Duro-Last Edge Metal System (EXCEPTIONAL® Metals)
    Custom-fabricated edge components that protect roof perimeters from wind and moisture while enhancing aesthetics.
  • Prefabricated Flashings and Penetration Details
    Factory-welded curb and equipment flashings for precise fits and long-term reliability.
  • Installation Accessories
    Sealants, termination bars, and fasteners approved for Duro-Last systems to maintain full warranty eligibility.

These materials ensured a clean install, reduced long-term maintenance, and helped the project stand out at the national level.

Aerial view of a large, single-story school building with a tan roof, surrounded by parking lots and green fields. Cars are parked in the lots. Nearby, there is a pond and vast farmland stretching into the distance under a clear sky.

See the Full Story

 

“187,000 square feet installed without issue.”

“Every detail was planned, inspected, and executed precisely.”

“Duro-Last recognized this as the standout project of the year.”

What Success Looks Like

Outcomes

  • 187,000 square feet of leak-free roofing
  • Minimal building disruption
  • Duro-Last Project of the Year Award
  • Strengthened trust and long-term relationship with the client

Trusted When It Matters Most

“May 7th is a day we’ll always remember at Grinnell Mutual. A major hailstorm hit with 80-mile-an-hour winds and softball-sized hail. Our building and grounds director got the call, and within hours, Jake and John from Duerson were on our roof—through the night—finding every hole. By the next morning, it was all hands on deck.”

Tammy Vos, Assistant VP – Facilities & Administrative Services

When the unexpected hit, Duerson responded immediately—earning trust through action. It’s that level of commitment and care that makes long-term partnerships possible.

Let’s Talk About Your Roof

Whether your current roof is showing signs of failure or you’re planning ahead, Duerson Corporation can help you get it done right—and built to last.