When an electric utility builds its own headquarters, energy efficiency moves from a design consideration to a core mission. Washington Electric Cooperative, serving nearly 10,500 customers across six counties in southeastern Ohio, faced exactly this challenge. The cooperative had operated for years from three separate facilities in Marietta, Ohio, dealing with persistent roof leaks, inefficient layouts, and rising operational costs. After five years of site planning and land acquisition, the company consolidated operations under one roof with a new facility built to LEED certification standards.
This case study examines the material and structural decisions that made the project successful: a standing-seam metal roof system for durability and weathertight performance, a clear-span steel structural system for flexibility, and integrated energy-efficient systems including geothermal heating and cooling, solar panels, and clerestory daylighting. For contractors and building professionals, the Washington Electric Cooperative project offers practical lessons in specifying high-performance building materials for commercial construction.
Standing-Seam Metal Roof Systems for Long-Term Building Performance
The most visible material decision on the Washington Electric Cooperative project was the standing-seam metal roof system. The cooperative’s previous buildings, including a 1963 brick administration building with a flat roof, had experienced chronic leak issues. Rooftop heat pump penetrations were a recurring source of water intrusion that disrupted operations and required ongoing maintenance.
A standing-seam metal roof system was selected to address these durability concerns. Unlike exposed-fastener metal roofs, standing-seam systems use concealed clips that allow the metal panels to expand and contract with temperature changes while maintaining a continuous weathertight seal. The vertical seams rise above the water drainage plane, providing superior resistance to water penetration even during heavy rain events.
Performance Attributes of Standing-Seam Metal Roofing
The roof assembly contributed to the project’s sustainability goals in several measurable ways:
- Weathertight performance: Continuous interlocking seams eliminate the fastener penetration points that cause most metal roof leaks, creating a reliable barrier against water intrusion.
- Long service life: Standing-seam metal roof systems routinely deliver 40 to 60 years of service with minimal maintenance, far exceeding the 15-to-20-year lifespan of many low-slope membrane roof systems.
- Energy efficiency: Cool-roof coating options reflect solar radiation and reduce heat gain, lowering cooling loads and HVAC energy consumption in the conditioned space below.
- Recyclability: Steel and aluminum roofing materials are fully recyclable at end of life, contributing to LEED material credit categories and reducing landfill waste.
| Roof System Feature | Washington Electric Cooperative Benefit |
|---|---|
| Concealed clip attachment | Eliminates fastener penetration leaks common in older flat roofs |
| Thermal expansion accommodation | Prevents panel buckling and oil-canning across large roof areas |
| High wind uplift resistance | Meets structural requirements for Ohio Valley weather conditions |
| Cool roof coating compatibility | Reduces solar heat gain and supports LEED energy performance credits |
| Recyclable steel substrate | Contributes to LEED MR credit for material lifecycle management |
For building professionals evaluating roof systems for commercial projects, metal roofs and cladding systems performance requirements provide specification guidance on material selection, attachment methods, and code compliance.
Clear-Span Steel Structural Systems for Flexible Commercial Floor Plans
Washington Electric Cooperative required a building that could accommodate two distinctly different operational functions under one roof: 1,004 square meters (10,800 square feet) of office space for administrative operations and 1,783 square meters (19,200 square feet) of operational support space for vehicle storage and equipment maintenance. At any given time, bucket trucks and track diggers maneuver through the back-of-house area while billing and customer service functions operate in the front.
Structural Design Decisions
The design team selected a clear-span steel structural system with 7.6-meter (25-foot) bays in the operational support zone. This bay spacing provided the necessary clearance for heavy equipment movement while maintaining cost-effective column placement in the office areas.
The structural system offered several advantages:
- Column-free interior spans: Clear-span framing eliminated interior columns in the equipment bay, allowing unrestricted vehicle maneuvering and flexible future reconfiguration of workspace layouts.
- Pre-engineered component coordination: The steel frame was designed and fabricated with pre-engineered connections, reducing field welding and speeding erection time compared to conventional structural steel.
- Integrated roof support: The steel structural system directly supported the standing-seam metal roof assembly, providing a coordinated structural-to-enclosure load path.
- Cost-effective bay spacing: The 7.6-meter bay dimension balanced structural material quantities against functional space requirements, achieving efficiency without oversizing frame members.
The clear-span approach proved particularly valuable because the cooperative’s operational needs did not require a full rigid-frame system. Instead, the structural steel framing provided the flexibility to optimize all work processes inside the facility while accommodating future changes in equipment size or layout.
Contractors and designers working on similar mixed-use commercial facilities can examine how prefabricated steel structures reduce construction costs and accelerate project schedules while maintaining design flexibility.
Daylighting and Building Envelope Strategies for Energy Performance
Energy efficiency goals drove every building envelope decision on the Washington Electric Cooperative project. The building was originally designed for entry-level LEED certification, with the team evaluating whether to pursue Silver certification through enhanced water runoff management and recycling programs. Regardless of the final certification level, the core energy strategies were built into the design from the start.
Clerestory Daylighting Design
The most striking envelope feature is a clerestory that runs the entire 61-meter (200-foot) length of the facility. This continuous band of 762-millimeter (30-inch) windows serves two purposes:
- Natural light distribution: The clerestory channels daylight deep into the building’s interior, reducing the need for artificial lighting during occupied hours. The gable-type window treatment on the front elevation adds architectural interest while maintaining the clerestory’s light-admitting function.
- Passive solar heating: South-facing clerestory orientation captures winter solar gain, reducing heating loads. During summer months, proper overhang design prevents overheating while maintaining daylight penetration.
All office spaces were positioned on the building’s outer perimeter to maximize window access. This layout strategy achieves dual benefits: it provides natural light to workstations where staff spend most of their time, and it allows the building to capture passive solar heat during winter months.
Integrated Mechanical Systems for Energy Efficiency
The cooperative’s CEO Ken Schilling emphasized the commitment to energy performance: “We really wanted to do it right when it came to the energy side. We wanted to walk the walk with everything from solar panels to high-efficiency water heating, geothermal heating and cooling, and high-efficiency windows.”
The mechanical system package included:
- Geothermal heating and cooling: Ground-source heat pumps transfer heat to and from the stable underground temperature, achieving efficiencies of 300 to 600 percent compared to conventional HVAC equipment. For commercial buildings with consistent occupancy loads, geothermal systems deliver the lowest lifecycle cost of any HVAC option.
- Solar panel array: Rooftop photovoltaic panels offset a portion of the building’s electrical load, reducing ongoing utility costs and contributing to LEED energy performance credits.
- High-efficiency windows: Insulated glazing units with low-emissivity coatings minimize thermal transfer through the building envelope, reducing both heating and cooling demands.
- High-efficiency water heating: Condensing water heaters capture exhaust heat that conventional units waste, raising overall thermal efficiency above 90 percent.
Building professionals specifying integrated mechanical systems can review how geothermal heat pump technology delivers measurable energy savings in commercial and institutional applications.
Project Delivery and Construction Management Lessons
The Washington Electric Cooperative project offers several lessons for construction project delivery, particularly for publicly funded facilities requiring competitive bidding.
Design-Build with Competitive Bidding
Because the project received financial assistance from the Rural Utility Service, a federal agency, it was required to go through a formal bid process. The cooperative initially approached a local builder for a design-build solution, but the RUS funding requirement shifted the delivery method. The project attracted nine bidders over 90 days, with local company Mondo Building and Excavating selected for construction.
Site Challenges and Solutions
During excavation, the construction team encountered a high-pressure gas line adjacent to the building footprint. This unforeseen condition required careful coordination with the utility provider and modified excavation procedures. Despite this challenge, the overall construction process proceeded smoothly.
For building professionals evaluating sustainable material choices for commercial projects, resources on selecting green building products for high-performance LEED construction offer practical specification guidance.
Key Takeaways for Construction Professionals
- Metal roof systems solve persistent leak problems: Standing-seam metal roofing eliminates fastener penetration leaks common in flat and low-slope roof assemblies, making it a durable choice for facilities where water intrusion disrupts operations.
- Clear-span steel framing accommodates mixed-use functions: Strategic bay spacing in pre-engineered steel structures supports both office and industrial activities within a single building envelope.
- Daylighting reduces long-term energy costs: Clerestory windows and perimeter office placement reduce lighting loads and provide passive solar heating benefits without complex mechanical systems.
- Integrated geothermal and solar systems maximize efficiency: Combining ground-source heat pumps with photovoltaic generation creates a comprehensive energy strategy that reduces both peak demand and ongoing utility expenses.
- Competitive bidding does not preclude local contractor selection: Public funding requirements for competitive bidding can still result in local contractor awards when the project specifications attract competitive regional participation.
The project’s overarching philosophy, as Schilling described it, was straightforward: “Our concept was we wanted a simple building, but one that was very energy efficient and functional. We were determined to get a lot of bang for our buck and have a building that will be useful for the next 50 years.” That balance of simplicity, efficiency, and durability is a model for commercial construction projects of any scale.