The Mountain Line Connection Center in Flagstaff, Arizona, will soon be one of the first buildings in Arizona to be designed using mass timber. To meet the city's growing transit service demands, Mountain Line worked with HDR for their extensive background in transportation engineering and design. Phase one involves constructing the new building and extending the existing 11-bus bay connector, enhancing city-wide connectivity and creating functional spaces for both riders and staff.

The job is "Buy America" meaning that over 95% of the materials we are installing for the project have been manufactured within the United States with Mass Timber still early in adoption throughout Arizona, Timberlab helped to get rid of some outdated code requirements for plywood on top of the CLT to act as the diaphragm.

This project will use a 3-coat protective coating system throughout the whole building and add a permapost treatment just at the front entry canopy. Timberlab came up with the idea to create a prefabricated wood ledger assembly to avoid the challenges we have had in the field installing ledgers on CMU walls in the past. The ledgers will be fully assembled with countersinks, bolts, plugs, and a moisture barrier before being set by the mason in 8’ units. Our digital construction team did the legwork to prepare the drawings for fabrication and installation on the ledgers. Although this product still needs to be installed, we hope it will be a good improvement for future jobs using this construction style.