Commercial Roofing Done Right.

As Wisconsin’s top-rated commercial roofing company, we specialize in Duro-Last® — the strongest and most energy-saving US-made roofing product available.

Experienced: We have over 30 years of flat roof experience.

Protected: Our 15-30 year roof warranties provide you with protection.

Satisfaction: Every roof is inspected by a Quality Control Inspector.

Serving: Appleton, Green Bay, Oshkosh, Neenah, Menasha, Milwaukee, Eau Claire, Madison, and further.

Free Inspection & Estimate


Warner builds roofs that last

The World’s Best Flat Roofing System

We understand how overwhelming getting a commercial roof can be. From finding a contractor you can trust, to choosing the suitable materials for your budget, and the disruptions and inconveniences of installations and repairs.

You want a safe, durable, and energy-efficient roofing system that provides long-lasting protection for your property. Peace of mind comes with knowing that the roof was installed by a reliable and experienced contractor and meets all necessary building codes and regulations.

Experience you can trust

Why Warner Roofing?

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roofs installed

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years in industry

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Over 2,000 Roofs


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Attention to Detail

We take great pride in ensuring that every aspect of the commercial roofing project is completed with the utmost precision and care.

Strong Work Ethic

Our Midwest work ethic is at the heart of everything we do, driving our commitment to hard work, honesty, and integrity and ensuring we deliver exceptional results for our clients.

Customer Service

We are focused on providing exceptional customer service and are committed to ensuring that every client is completely satisfied with our work.

Honest Communication

You are informed throughout the entire commercial roofing process and provide a transparent and clear communication regarding the work.

“Warner Roofing has installed numerous flat roofs for us all over the country. Never had a problem – we trust the work they do”

Dave Leblanc

Facility Manager, County Materials

“We work with Steve and his team because they stand behind their work.”

Rollie Winter

President, Rollie Winter & Associates, Ltd.

“Steve Warner and his team have been great to work with. They know what they are doing, they show up when they say they will, and best of all they stand behind their work.”


Pastor, Mission Church

We’re Trusted


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Our strongest & most energy-saving roofing

Features of Duro-Last®

Available Colors:

Energy Efficient

The Duro-Last Commercial Roof reflects up to 86% of the sun’s rays, resulting in saving up to 35% on energy costs! Eco-roofs can qualify for capital improvement tax advantages.


Prefabricated to the exact size and to accommodate all rooftop penetrations, Duro-Last’s factory-built roofing eliminates up to 85% of on-site seaming during installation, resulting in a more precise, efficient, and durable commercial roofing system.

Industry Best Warranty

With a comprehensive range of warranties ranging from 15-30 years, Duro-Last provides maximum protection to commercial and industrial buildings, including coverage for damage caused by ponding water and consequential damages resulting from defects in the Duro-Last material.

Proven Track Record

Over one billion square feet of Duro-Last roofing systems have been installed across the United States, Canada, and Mexico since its establishment in 1978.

Get the answers you’re looking for

Frequently Asked Questions from Commerical Customers

How do we know that we can trust you?

With over 30 years of experience working on some of the largest commercial roofing projects in Wisconsin, we have a proven track record of delivering exceptional results that stand the test of time. Many of our completed projects, which are over 20 years old, have required little to no repairs. If you would like to learn more, we are happy to provide a full list of references to demonstrate our expertise and reliability.

How do I know what material is best?

Duro-Last is the best choice for flat roofs due to its exceptional durability and energy efficiency. Its factory-prefabricated design and custom fit also reduce the need for on-site seaming, minimizing installation time and labor costs. Watch the video above or learn more here:

Are there tax incentives to eco-friendly roofing options?

One of the tax advantages of using Duro-Last roofing material is that it can be considered a capital improvement, which means it may qualify for certain tax deductions or credits. Additionally, the energy efficiency of Duro-Last can help commercial building owners save on energy costs and potentially qualify for additional tax incentives.

Will the installation process be disruptive?

Duro-Last’s installation process is designed to be less disruptive, ensuring a quiet and safe experience without the use of loud machinery, minimizing interruptions to your business operations.

Does my roof need an inspection?

If your commercial roof is older than 15 years and hasn’t had regular roofing maintenance, or has experienced storm damage from hail or wind, it’s important to have it inspected. Different materials also have different life expectancies, and if your building is having multiple leaks, this could be a sign that the roof is reaching the end of its life. An inspection can help identify potential issues before they become more serious and costly problems.