Railyard Flats is a testament to innovative design and sustainable construction in Sioux Falls, South Dakota.
Completed in 2021, this 4-story, 83,000-square-foot mixed-use building is the state's first modern mass timber project. Developed by Pendar Properties, Railyard Flats, it demonstrates a commitment to high-quality design and sustainable construction, contributing to the vibrancy of the downtown Eastbank neighborhood.
The project, located on a former railroad switchyard in the burgeoning Eastbank neighborhood, presented the design team with a unique challenge: to create a modern structure that paid homage to the area’s industrial past. CO-OP Architecture, the local firm responsible for the design, rose to the occasion, crafting a building that seamlessly blends contemporary aesthetics with the site's historical context.
Mass Timber Takes Center Stage
At the heart of Railyard Flats' distinctive character is its innovative use of mass timber. This choice was driven by several factors, including sustainability, ease of construction, and the desire to create a visually appealing and unique structure. The exposed timber elements throughout the building serve a structural purpose and contribute to a warm and inviting atmosphere, tapping into the biophilic properties of wood.
The project showcases a hybrid structural design utilizing both mass timber and light-frame construction. Glulam beams and columns provide structural support, while the ceilings feature exposed mass timber decking, specifically dowel-laminated timber (DLT). DLT was a relatively uncommon choice in the U.S. at the time, but StructureCraft, a Canadian firm specializing in timber engineering and construction, recommended it.
“StructureCraft brought our expertise in mass timber engineering to the project, working with CO-OP Architecture and the other consultants to deliver the structural design within a compressed schedule. The client and design team were inspired by a visit to one of StructureCraft’s other project’s, 111 East Grand in Des Moines, desiring to achieve a similar aesthetic with exposed Glulam and DLT throughout.” - Benjamin Epp
Dowel Laminated Timber - A Sustainable and Efficient Solution
DLT panels, prefabricated off-site, were particularly well-suited to Railyard Flats’ long horizontal spans. Compared to cross-laminated timber (CLT), the thinner DLT proved to be a more cost-effective solution. “The exposed ceilings in the lofts highlight the prefabricated DLT panels and Glulam frame.” - Benjamin Epp
DLT's all-wood composition, with its grain running in one direction, contributes to its structural efficiency. The panels, topped with a sound mat and concrete, provide both structural integrity and acoustic insulation, meeting the higher standards required for residential construction. The exposed DLT ceilings also benefit from a fine-line kerf profile added to the board edges, enhancing the wood's visual appeal.
A Collaborative Design and Construction Process
Railyard Flats' success was a result of close collaboration between the project team members. CO-OP Architecture, pioneers of mass timber construction in South Dakota, sought the expertise of StructureCraft to bring their vision to life. StructureCraft, acting as both engineer and builder, worked closely with CO-OP and other consultants to deliver a structurally sound and aesthetically pleasing design within a tight timeframe.
Pendar Properties, the owner and developer, played a key role in driving the project's sustainable and innovative approach. Their desire for a unique and high-quality building that would contribute to the vibrancy of downtown Sioux Falls is evident in every detail of Railyard Flats.
A Community Hub with Lasting Impact
Railyard Flats is a testament to the power of community-focused development. The project embraces walkability, with easy access to nearby shops, restaurants, and green spaces. Amenities like a shared rooftop deck and fitness center further foster a sense of community among residents.
The building's mixed-use nature, with residential units, retail space, and offices, contributes to the vibrancy of the Eastbank neighborhood. The ground floor is home to local businesses, including the popular cocktail bar Highball, adding to the development's appeal.
A Model for Future Development
Railyard Flats has been lauded for its unique design, sustainable construction, and positive impact on the community. The project's high occupancy rates and positive resident feedback speak to its success. DLT in particular, has set a precedent for future mass timber construction in South Dakota, showcasing the material's potential for creating beautiful, efficient, and environmentally responsible buildings.
Railyard Flats is a model for future development, demonstrating how innovative design and sustainable practices can revitalize urban areas while respecting the site's historical context. The project's success lies in its thoughtful approach to form and function, creating a vibrant and welcoming community space that celebrates the beauty and versatility of wood.
Project Team:
Acoustics: Rothoblaas
Architect: CO-OP Architecture
Owner/Developer: Pendar Properties
General Contractor: Journey Construction
Structural Engineer & Timber Subcontractor: StructureCraft
This is a partial list of all the individuals and organizations contributing to the Railyard Flats Sioux Falls project. In the comments section, please let us know if you contributed in any way.
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