Extensive Roofing Portfolio

Installed and warrantied over 2,000 flat roofs since 1983

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Duro-last® Flat Roofing Contractor

#1 in Wisconsin and Consistently Among the top in the nation

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Roof Repair + Replacement

Leaky roof? Not energy efficient? We can help.

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Commercial Roofing Contractors in Wisconsin

Installing Flat Roofing Solutions in Wisconsin and Michigan


Roofing Services

  • Free Roofing Estimates
  • Free Long-Term Budgeting
  • Free Bid Packets including specifications and bid form
  • Maintenance and Repair Services

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Duro-Last Flat Roofing Systems

Discover long-lasting satisfaction and durability with a reliable Duro-Last roof. Backed by the best warranties out there -- it's the only flat roofing system Nasi Roofing will install.

Nasi Roofing’s dedicated commercial roofing contractors have been installing commercial roofs throughout Wisconsin and Michigan since 1983. We are also trusted Duro-Last contractors. We have installed and warrantied over 2,000 flat roofs totaling over 10 million square feet of membrane.

As dedicated commercial roofing contractors in Wisconsin, our company is consistently listed among the top Duro-Last contractors in the nation.

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Metal Retro-fit Roofs

A Duro-Last roof installed over an aging metal roof by our Wisconsin roofing company will give you a better roof than you had to originally and save you money on heating costs.

The Duro-Last roofing system is quick to install because it goes right over your existing roof, eliminating the need for costly tear-offs and disposal.

Your new metal retro fit roof will not crack or leak around penetrations, rust or corrode, require periodic maintenance, creak with temperature changes, or radiate your plant's energy into outer space.

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Don't worry, we've got you covered

The last thing you need to worry about is the roof over your head.

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Duro-Last Roofing