PVC Roof Case Study

ELVALOY™ brings design to downtown Minneapolis

Minneapolis needed a new stadium. A stadium that could host everything from college basketball to professional football. A stadium that shielded from the elements, strong enough to hold snow. A stadium with natural light, allowing fans to see a view of downtown. That’s where the challenge came in – a budget-considerate translucent roof with mobile front windows.

The roofing portion of the project began in April 2015, working against an aggressive completion deadline of November. According to Berwald Roofing Senior Project Manager Steven Hegge, “Getting material 300 feet up to the roof was our biggest challenge. A big part of that was scheduling time to share the cranes with the iron workers and general contractor.”

Another challenge was storing material during the installation due to the limited amount of space on the roof. All the decking had to be installed as work progressed, just before roof installation. “The general contractor and Berwald Roofing have worked with Johns Manville on numerous stadium projects in the past and preferred to use JM PVC on this complicated stadium project. This application is on a 3.75"-12" slope on the north side of the building, which adds to the difficulty of installing a fully adhered PVC roof assembly,” noted Johns Manville sales rep Bob Deans.

The Solution

Due to restricted loading space at the jobsite, materials arrived to Berwald’s yard directly from Johns Manville. From there, they were loaded on Berwald Roofing semi-trucks each day for delivery. Once they arrived at the site, they were immediately lifted to the roof via tower cranes and installed in the most efficient timeframe, to meet the expected installation timeline.

The stadium seats approximately 65,000 people for most games, however, it is built to be expandable to hold up to 73,000 attendees for special events such as the professional football championship game, which the stadium was scheduled to host on February 4, 2018. The project was successfully completed in time.

“Johns Manville now has roof systems on major sport stadiums in the greater Minneapolis area since installing this PVC system on the new facility,” noted Deans. U.S. Bank’s logo is prominently displayed on the rooftop. Charcoal grey 60 mil PVC membrane was cut to specification using a computerized cutter to create an exact replica of the U.S. Bank logo. Berwald Roofing then adhered the charcoal grey PVC on top of the grey 60 mil PVC membrane using JM PVC Membrane Adhesive (Low VOC) and then heat-welded the edges of material to nish the application of the logo.


Minneapolis, MN

Building Representative

Minnesota Sports Facility Authority

General Contractor

Mortenson Construction


HKS, Inc.
Studio Hive, Studio Five and Lawal Scott Erickson Architects Inc.

Roofing Contractor

Berwald Roofing Company, Inc.,
North St. Paul, MN
Steven Hegge, Senior Project Manager
JM Peak Advantage® Pinnacle Council® Contractor

Industry Affiliations

National Roofing Contractors Association
Midwest Roofing Contractors Association

Roofing System Solution: SP6R-S/C
20-Year JM Peak Advantage® Guarantee
Metal Roof Deck
1⁄2" DensDeck Prime
JM Vapor Barrier
2 Layers of 1.6" ENRGY 3® Insulation
1⁄2" DensDeck Prime
280,000 SF 60 mil JM PVC (Grey) Fully Adhered
29,000 SF 60 mil JM PVC Charcoal Grey – logo
JM PVC Membrane Adhesive (Low VOC)