Three Sioux City Community School District Projects Are Part of Long-Term Plan

In 2017, Winkler Roofing crews re-roofed portions of two high schools and one elementary school. Shown here is an aerial photo of East High School. Photos: Mule-Hide Products Co. Inc.

For the Sioux City Community School District (SCCSD) in Sioux City, Iowa, the final dismissal bell of the school year marks more than the start of summer break for students and staff. It also signals the beginning of roofing season.

In addition to routine maintenance and repairs, each summer brings at least one major roofing project for the district and its 24 facilities. Existing roofs that have fallen out of warranty coverage are replaced. The district also has completed a steady stream of construction projects over the past 16 years, replacing aging schools to meet evolving needs.

District enrollment has increased by several hundred students over that timeframe and now stands at more than 14,500. SCCSD also has expanded its programming, creating specialty elementary schools focusing on STEM (science, technology, engineering and math), computer programming, environmental sciences, the arts, and dual-language education in English and Spanish. These specialties continue with middle school exploratory classes and eventually lead to the Sioux City Career Academy, which offers numerous education pathways to help students prepare for postsecondary education and careers.

Aerial view of West High School. Photos: Mule-Hide Products Co. Inc.

“Our facilities need to keep up with the curriculum and new technologies so we can provide the best possible learning environments for our students,” says SCCSD Director of Operations and Maintenance Brian Fahrendholz, adding that the facilities plan emphasizes both supporting student achievement and maintaining fiscal responsibility.

Winkler Roofing Inc. of Sioux City has been one of the district’s key partners in this process for more than 20 years, installing new or partial roofing systems on nearly every building in the district. The summer of 2017 saw its crews re-roof portions of two high schools and one elementary school, installing 335 squares of new TPO roof systems and removing 170 tons of ballast.

A crew of between six and nine professionals was on a jobsite at any given time. The three projects were completed in less than a month, beginning in late June and wrapping up in late July. And there was nothing on the punch list following the warranty inspections.

A Systematic Approach

In recent years, SCCSD has adopted a systematic, long-range-planning approach to roof system management, working with local architects to evaluate its facilities, identify and plan work that needs to be completed the following summer, and map out future projects. The three roofs replaced in 2017 were indicative of this approach.

TPO Bonding Adhesive is applied on the substrate and the back of TPO membrane. Photos: Mule-Hide Products Co. Inc.

Each of the roofs was between 15 and 20 years old and had begun to show signs of age. Their manufacturers’ warranties had also expired in recent years, making their replacement next up on the district’s roofing project schedule.

“We typically replace roofing systems within five years of the warranty expiration,” Fahrendholz explains. “It enables us to stay ahead of the maintenance issues that can begin cropping up.”

All three existing roofs had ballasted EPDM roofing systems. The re-roofing projects continued the district’s move toward TPO systems and, where possible, eliminating ballast. The three new roofing systems have 20-year, no-dollar-limit labor and material warranties.

SCCSD has several reasons for moving away from ballasted systems, according to Winkler Roofing President Jeff Winkler, P.E. In addition to reducing the roof’s weight and eliminating the cost of the ballast, unballasted roofs have a neater appearance and it is easier to monitor the membrane’s condition and find and repair any leaks. And, of course, when the time for re-roofing comes, there are no truckloads of ballast to remove and replace.

According to Winkler, SCCSD likes the durability of TPO membranes. “They like that the membrane is reinforced and that the seams are heat-welded, rather than seamed with primer and tape,” Winkler notes.

East High School Project

Re-roofing a 5,356-square-foot section at East High School entailed a complete tear-off of the existing ballasted EPDM roofing system and insulation down to the steel roof deck. The Winkler Roofing team then installed a new system topped with Mule-Hide TPO with CLEAN Film from Mule-Hide Products Co. It was the first time Winkler Roofing had installed the prodcut.

At East High School, polyisocyanurate insulation is installed using 3-inch galvalume plates and drill point fasteners. Photos: Mule-Hide Products Co. Inc.

Three layers of polyisocyanurate insulation were mechanically fastened with screws and plates to enhance the building’s energy efficiency. The 60-mil TPO membrane was then fully adhered using TPO Bonding Adhesive from Mule-Hide Products.

The last step in any well-done TPO project is removing the dirt and scuffs that are inevitably left behind during installation, notes Winkler. That step is eliminated with this product; the crew simply removes the protective film covering the membrane to reveal a clean roof that is ready for inspection.

“The material is more expensive than regular TPO membranes, but there is the potential to make up for that in reduced labor costs,” Winkler notes.

The biggest benefit would be seen on roofs that have fewer penetrations, according to Winkler. Installing the membrane around penetrations requires removing a portion of the protective film, he explains. Because those areas are then exposed to scuffs and dirt, crews must go back and clean them by hand.

West High School Project

Meticulous detail work was key to the successful replacement of a 18,056-square-foot section of the roof at West High School. There were nearly four dozen penetrations in the roof, from 4-inch pipes to HVAC equipment measuring 8 feet by 12 feet. Many of the chimney stacks also were in spots that were awkward for the crew to work around.

Winkler Roofing crew members prepare to install a TPO walkway pad. Photos: Mule-Hide Products Co. Inc.

It was all in a day’s work for the Winkler Roofing team. “The quality of our detail work is one of the things we take pride in,” Winkler says. “The keys are good leadership, both on and off the roof, and a well-seasoned crew. My foreman, Absalon Quezada, is a master of solving the toughest of details and coordinating a well-orchestrated crew.”

The roof’s existing concrete deck made a mechanically attached system uneconomical, so a new ballasted system was specified. The existing ballast had deteriorated to the point that, if reused, it could puncture the new roofing membrane. So, all 100 tons of it, along with the existing EPDM membrane, were removed and disposed of. The pieces of stainless steel cap metal along the perimeter were removed and numbered in sequence for reinstallation later. Sections of water-damaged insulation were removed and replaced.

An additional layer of polyisocyanurate insulation was loose-layered over the entire roof to improve energy efficiency, followed by a new loose-layered 60-mil white TPO membrane. New ballast was then installed.

Details such as this pipe boot were installed using a hot-air welder. Photos: Mule-Hide Products Co. Inc.

The crew navigated a challenging site while depositing the new ballast on the roof of the one-story building. The site offered only one feasible parking spot for the seven dump trucks that would deliver the rock, and that was on a lawn, just on the other side of two large trees. Crews carefully noted the location of sprinklers for the in-ground irrigation system to avoid driving over them, and shut the system down for several days in advance of the delivery to minimize ruts caused by the trucks’ tires. The trees’ trunks were spaced less than 20 feet apart and the canopies have grown together, leaving only small tunnel to feed the conveyor through. Crews kept the conveyor low as they extended it through the branches, then brought it to roof height by repeatedly raising it and the backing the truck up.

Riverside Elementary School Project

At Riverside Elementary School, a 7,314-square-foot section of roof was replaced with a 60-mil, fully attached TPO system.

The existing EPDM membrane, ballast and edge metal flashings were removed and disposed of. Crews removed and replaced any water-damaged insulation, added an additional layer of polyisocyanurate insulation throughout to increase the building’s energy efficiency, and mechanically attached the insulation to the steel roof deck using screws and plates. The white TPO membrane was then installed using bonding adhesive, and new edge metal flashings were added.

Straight A’s on the Report Card

The new roofs received top grades on their inspection report cards.

At East High School, crews installed Mule-Hide TPO with CLEAN Film from Mule-Hide Products Co. The last step in the installation process is removing the protective film covering the membrane. Photos: Mule-Hide Products Co. Inc.

When Mule-Hide Products Co. Territory Manager Jake Rowell inspected the roofs, there were no items on his, or the district’s, punch list. The only remaining task — which was completed during the inspection — was covering the seams on the West High School roof with ballast; they had intentionally been left exposed for easy inspection. In fact, that was the only “to-do list” item Rowell noted during inspections of 11 Winkler Roofing projects that week.

“The quality of their work is phenomenal,” Rowell says. “The crews take pride in their work. They don’t just throw a project together and move on. They check their work to make sure it’s done right before I see it and before the customer sees it.”


Roofing Contractor: Winkler Roofing Inc., Sioux City, Iowa
Architect: FEH DESIGN, Sioux City, Iowa,
Roofing Materials Distributor: ABC Supply Co. Inc.,
Decorative Sheet Metal: Interstate Mechanical Corp., Sioux City, Iowa,


TPO Membrane Roof Systems: Mule-Hide Products Co. Inc.,

Mule-Hide Products Co. Launches Redesigned Website 

Mule-Hide Products Co. Inc. has redesigned its website, making it faster and easier for users to access the information they need when choosing, specifying, installing, maintaining or repairing Mule-Hide low-slope roofing systems.

The extensive and easily navigated product catalog can be searched by roofing system type (single-ply systems, coating systems, modified bitumen systems, vegetative roofing systems, systems for use in modular construction, and maintenance and repair products) or by specific product category (membranes, adhesives, insulation, coatings, accessories, etc.). Overviews of each roofing system type summarize their features and benefits, helping users choose the right system for a given job. Product-specific information includes charts of part numbers, sizes and packaging; detail drawings; installation instructions and videos; code approvals, certifications; specification manuals; estimating worksheets; warranty information and more.

The site was designed with mobile devices in mind, making it easy for users to access the information and services they need, no matter where they are and no matter what type of device they’re using – whether it’s a mobile phone on a rooftop, a tablet in a customer’s conference room or the computer on their own office desk.

The “Find-a-Rep” function enables users to pinpoint the nearest Mule-Hide Products distributor or Territory Manager.

The website also keeps users posted on the latest news from Mule-Hide Products, including product introductions, notable projects, technical updates and upcoming trade shows.

The site’s back-end architecture and content management system are the latest technologies, ensuring that the site and its services load quickly.

The new site design, architecture, security, database integrations and custom applications were provided by Iowa Computer Gurus of West Des Moines, Iowa.

For more information, visit

Offices & Warehouses

Workforce Essentials, Clarksville, Tenn.


Roofing and Wall Panel Installer: Modern Heating Cooling Roofing, Clarksville, (931) 647-0815
Architect: Lyle Cook Martin Architects, Clarksville
Metal Panel Distributor: Commercial Roofing Specialties Inc., Nashville, Tenn.

Workforce Essentials is a private, non-profit organization providing workforce development services for the Tennessee Department of Labor in a nine-county area.

Workforce Essentials is a private, non-profit organization providing workforce development services for the Tennessee Department of Labor in a nine-county area.

Roof Materials

To meet design objectives, four different PAC-CLAD products were selected. The roof uses 20,500 square feet of 16-inch, 24-gauge Silver Metallic Tite-Loc Plus panels. The façade features 7,800 square feet of Precision Series wall panels finished in Sierra Tan and installed vertically. Complementing the façade is 4,000 square feet of 12-inch Almond Flush panels installed as soffit. In addition, 4,520 square feet of 24-gauge Medium Bronze flat sheet was used for fascia and trim.

“The Tite-Loc Plus panels were long—85 feet—and were rollformed onsite,” says Bill Kimbrough Jr., estimator and project manager for Modern Heating Cooling Roofing. “Getting them up to the high roof was a challenge. All other profiles were fabricated and delivered by Petersen. Currently, PAC-CLAD is about the only product we use.”

Metal Panel Manufacturer: Petersen Aluminum Corp.

The roof uses 20,500 square feet of 16-inch, 24-gauge Silver Metallic Tite-Loc Plus panels.

The roof uses 20,500 square feet of 16-inch, 24-gauge Silver Metallic Tite-Loc Plus panels.

Roof Report

Workforce Essentials is a private, non-profit organization providing workforce development services for the Tennessee Department of Labor in a nine-county area in the middle of the state. Located on a highly visible urban-infill site, the new Workforce Essentials headquarters and career training center is situated at a “gateway entry” intersection to the downtown district. The new 40,000-squarefoot facility consolidates services that had been provided at agency offices previously scattered around the city. After initially considering renovation of an aging building on the site, the organization’s board of directors determined that construction of a new, energy-efficient headquarters was a better course of action. Good visibility and an easily identifiable aesthetic were important to site selection and building design criteria.

Different departments within the building are visually and strategically defined in separate wings and entrances. The administrative office wing to the south is defined by a vertical brick corner tower and sloping metal roof planes and cladding. The larger career training center portion of the building is introduced by metal wall panels in a calming color palette of Sierra Tan. Thematic entry canopies, protruding aluminum sunshades and aligned horizontal fenestration tie together the architectural composition. The overriding idea is for the building to serve as a machine with different parts working together for a common purpose.

Brad Martin, principal/designer at Lyle Cook Martin Architects, explains: “Workforce Essentials has a variety of regional offices throughout the area it serves. All are different and very few are freestanding. The organization has never really had a corporate look or identity. Now, with this new building, we can incorporate its design features and architectural aesthetics into future new buildings and renovations and begin to develop an iconic look.”

Photos: Petersen Aluminum Corp.

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Joint and Termination Sealant Designed for Large Joints, Roof Termination Bars

JTS 1 joint and termination sealant from Mule-Hide Products Co. The new JTS 1 joint and termination sealant from Mule-Hide Products Co.allows contractors to quickly and easily seal large joints and roof termination bars – including those submerged under water – with no sagging or shrinking and minimal odor. According to the manufacturer, the 100-percent solids, moisture-cure urethane sealant delivers excellent adhesion to EPDM and PVC membranes, concrete, masonry, wood, vinyl and other common building materials. Primer is required when using it on TPO membranes.
The joint and termination sealant is designed to offer exceptional workability for quick, easy application in both dry and wet surface applications. It has a tack-free time of just 30 minutes. The solids content of JTS 1 eliminates shrinking and sagging. The sealant can, therefore, be used to provide watertight closure of joints up to 2 inches wide and 1 inch deep.
JTS 1 is isocyanate-free, enabling it to be packaged in durable plastic cartridges without losing workability. Unlike cardboard tubes, the cartridges can be submerged under water to repair roof leaks, gutters and downspouts. They also better withstand the rigors of transportation, storage and jobsite conditions without becoming damaged.
Solvent-free JTS 1 has minimal odor. Its volatile organic compound (VOC) content of less than 10 grams per liter makes its use allowable in areas with VOC restrictions. It is available in eight colors – white, black, bronze, gray, limestone, wicker/tan and terra cotta.

Roofing Adhesive Features One-Step Application Process

Helix Low-Rise Adhesive is ready to use from the container, no mixing required.

Helix Low-Rise Adhesive is ready to use from the container, no mixing required.

With a one-step application process, Helix Low-Rise Adhesive from Mule-Hide Products Co. provides adhesion of approved roof insulations, thermal barriers, cover boards and fleece-backed single-ply membranes to a variety of roofing substrates.
The polyurethane foam is applied in a single step. Both parts of the adhesive are ready to use from the container – no mixing required – and are applied simultaneously in a 1:1 ratio through a static mix tip. It is applied in continuous ribbons or beads spaced 4, 6 or 12 inches apart, depending on the project and code requirements. There is no overspray, and it cures in minutes.
Helix Low-Rise Adhesive contains no volatile organic compounds (VOCs), chlorofluorocarbons (CFCs) or hydro chlorofluorocarbons (HCFCs). 
It does not require mechanical fasteners, maintaining a puncture-free vapor retarder, preventing thermal bridging and protecting the structural integrity of the roof deck.
The bond created by Helix Low-Rise Adhesive provides wind uplift resistance, allowing it to be used on buildings in higher wind zones. In addition, it provides hail resistance when used as an adhesive for fleece-backed membranes.
Helix Low-Rise Adhesive comes in cartridge twin-pack tubes or two-tank sets. Both include one container of each of the adhesive’s two components – Part A and Part B. Cartridge twin-packs cover approximately 200-600 square feet of roof and tank sets cover approximately 1,000-3,000 square feet of roof, depending on bead spacing.
The cartridges fit most dispensing guns currently available on the market. Tank sets come with a Helix Gun Assembly (25-foot dual-hose with attached spray gun), petroleum packet, wrench, and 10 Tank Static Mix Tips. Contractors need not purchase specialty pumps or spray rigs. No external power source is required to run application equipment.

Project Profiles: Education Facilities

Maury Hall, U.S. Naval Academy, Annapolis, Md.


Roofing Contractor: Wagner Roofing, Hyattsville, Md.
General Contractor: C.E.R. Inc., Baltimore, (410) 247-9096

The project included 34 dormers that feature double-lock standing-seam copper and fascia metal.

The project included 34 dormers that feature double-lock standing-seam copper and fascia metal.


Wagner Roofing was awarded the complete replacement of all roof systems. These included an upper double-lock standing-seam copper roof system, a bullnose copper cornice transition, slate mansard, 34 dormers with double-lock standing-seam copper and fascia metal, eight copper hip metal caps and a continuous built-in gutter with decorative copper fascia. Each of the dormers also had a copper window well.

The upper standing-seam roof was removed and replaced with 24-inch-wide, 20-ounce copper coil rollformed into 1-inch-high by 21-inch-wide continuous standing-seam panels that matched the original profile. The eave bullnose, which also served as the mansard flashing, was removed and returned to Wagner Roofing’s shop where it was replicated to match the exact size and profile.

The 34 dormer roofs were replaced with 20-inch-wide, 20-ounce copper coil formed into 1-inch-high by 17-inch- wide continuous standing-seam panels. The decorative ornate fascia of the dormers was carefully removed and Wagner’s skilled craftsmen used it as a template to develop the new two-piece copper cornice to which the roof panels locked. The cheeks and face of the dormers were also re-clad with custom-fabricated 20-ounce copper.

The oversized built-in-gutter at the base of the slate mansard was removed and replaced with a new 20-ounce copper liner custom-formed and soldered onsite. The replacement included a specialty “bull-nosed” drip edge at the base of the slate and an ornate, custom-formed fascia on the exterior of the built-in gutter. The decorative copper fascia included 85 “hubcaps”, 152 “half wheels” and 14 decorative pressed-copper miters. The original hubcap and half-wheel ornaments were broken down and patterns were replicated. Each ornamental piece was hand assembled from a pattern of 14 individual pieces of 20-ounce copper before being installed at their precise original location on the new fascia. The miters were made by six different molds, taken from the original worn pieces, to stamp the design into 20-ounce sheet copper.

In all, more than 43,000 pounds of 20-ounce copper was used on the project.

Copper Manufacturer: Revere Copper Products


Maury Hall was built in 1907 and was designed by Ernest Flagg. Flagg designed many of the buildings at the U.S. Naval Academy, including the Chapel, Bancroft Hall, Mahan Hall, the superintendent’s residence and Sampson Hall. His career was largely influenced by his studies at École des Beaux-Arts, Paris. Examples of Flagg’s Beaux-Arts influence can be found in the decorative copper adorning the built-in gutter on building designs.

Maury Hall currently houses the departments of Weapons and Systems Engineering and Electrical Engineering. The building sits in a courtyard connected to Mahan Hall and across from its design twin, Sampson Hall.

PHOTO: Joe Guido

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Roof Drains Designed for New Construction and Retrofits

Mule-Hide Products Co. has added a selection of roof drains to its offerings.

Mule-Hide Products Co. has added a selection of roof drains to its offerings.

Mule-Hide Products Co. has added a selection of roof drains to its offerings. For new construction, kits feature drains with heavy-duty bodies made of injection-molded PVC or epoxy-coated cast iron. For retrofit applications, options suit the requirements of any project and all are designed for quick, easy installation. Aluminum and copper outlets are available. Flange material choices include aluminum, asphalt, copper and—for contractors who prefer to heat-weld the flange to the outlet—TPO and PVC. All drains are available in multiple sizes with elevated strainer ring risers to increase water flow through the drain and clamping rings with undersides that ensure the drain ring is tightly secured to the roof membrane.

Air and Vapor Barrier Creates a Seal Between a Low-slope Roofing System and the Building Below

F1 Air & Vapor Barrier from Mule-Hide Products Co.

F5 Air & Vapor Barrier from Mule-Hide Products Co.

F5 Air & Vapor Barrier from Mule-Hide Products Co. allows contractors to quickly and easily create an air- and vapor-tight seal between a low-slope roofing system and the building below.

F5 Air & Vapor Barrier is compatible with a wide variety of roofing systems and can be used on primed substrates, including concrete, plywood, exterior gypsum, DensDeck Prime and SECUROCK. It also can serve as a temporary roof for up to 120 days while work on the finished roofing system is completed.

The membrane is a 40 mil-thick composite consisting of 35 mils of self-adhering rubberized asphalt laminated to a 5 mil-thick woven polypropylene film. Rolls are 39 inches wide and 75 feet long and cover approximately 244 square feet of substrate surface.

F5 Air & Vapor Barrier’s factory-controlled thickness helps ensure that the membrane has uniform barrier properties, reducing moisture movement through the roofing system and helping keep conditioned air inside the building and unconditioned air outside. The woven polypropylene film makes the membrane highly resistant to tears and punctures. The non-skid surface helps keep contractors safe on the job site and is suitable for the bonding of subsequent layers of the roofing system.

A siliconized one-piece release liner prevents the material from bonding to itself in the roll and is easily removed during installation of the barrier.

Coating Extends the Life of Aging Roofs

The new Silicone Roof Coating System from Mule-Hide Products Co. Inc. can be used to restore and repair asphalt, modified bitumen, metal, concrete, TPO, PVC and EPDM roof systems.

The new Silicone Roof Coating System from Mule-Hide Products Co. Inc. can be used to restore and repair asphalt, modified bitumen, metal, concrete, TPO, PVC and EPDM roof systems.

The new Silicone Roof Coating System from Mule-Hide Products Co. Inc. can be used to restore and repair asphalt, modified bitumen, metal, concrete, TPO, PVC and EPDM roof systems. It includes a cleaner to prepare the substrate for priming; two primers to improve adhesion of the topcoat; a multipurpose sealant for use with reinforcement roofing fabric to complete repair and maintenance tasks; three topcoats—Silicone Roof Coating (available in white and gray), Silicone Masonry Wall Coating (available in white and gray) and Silicone Skylight Coating; and a cleaner to wash tools and equipment. All products are solvent-free and comply with VOC regulations throughout North America.

Create Cost-effective Modified Bitumen Roof Systems

Mule-Hide Products Co. Inc. has released several choices for creating modified bitumen roof systems that are cost-effective and contractor-friendly while delivering long-term performance.

Mule-Hide Products Co. Inc. has released several choices for creating modified bitumen roof systems that are cost-effective and contractor-friendly while delivering long-term performance.

Mule-Hide Products Co. Inc. has released several choices for creating modified bitumen roof systems that are cost-effective and contractor-friendly while delivering long-term performance. Its APP Torch Base membranes are designed as base or interply sheets in new construction, retrofit and flashing detail applications. Its APP Torch Cap Sheet membranes can be applied as a heat-welded cap sheet or flashing in new construction and retrofit projects and for repairing built-up roof systems. Its G2 Base roof system base sheets are designed for built-up and modified bitumen roof systems. The new products join the Mule-Hide Modified Bitumen roofing system suite of products, which also includes self-adhering membranes and accessories.