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Insulated rainscreen continues barrier

Approximately 40,000 square feet of Deer Park, Wash.-based Knight Wall Systems' MFI-System rainscreen cladding was installed on Providence Health Care's Medical Park, Spokane Valley, Wash.

Approximately 40,000 square feet of Deer Park, Wash.-based Knight Wall Systems' MFI-System rainscreen cladding was installed on Providence Health Care's Medical Park, Spokane Valley, Wash. The design team, including Seattle-based Mahlum Architects, chose Knight Wall's MFI-System rainscreen to be used with 2 inches of mineral fiber insulation because the system's components could be spaced at greater distances than other sub-framing methods. This decreased overall material and labor costs and reduced penetrations into the building envelope.

Bouten Construction Co., Spokane, Wash., was the general contractor for the $44 million, 127,000-square-foot outpatient facility, built on 11 acres. Brendon Warren, senior project manager at Bouten Construction, says, "The main reason we went with the Knight Wall System was because it is thermally isolated and can be adjusted to make up for framed walls that are not perfectly plumb."

Mike Kilgore, of installer Kilgore Architectural Products, Spokane Valley, says all moisture and air penetration had to be accounted for to accommodate changing energy codes that require a continuous air and vapor barrier. Using the Knight MFI-System behind Greenville, Tenn.-based Jarden Zinc Products' zinc façade made it a smarter, higher-performance exterior cladding, Kilgore says. "Exterior insulation behind a rainscreen vented top and bottom was a good solution," he adds.

Dwayne Epp, AIA, LEED AP, project architect at Mahlum Architects, says the buildings were designed to meet Washington State Energy Code requirements. "Mineral fiber insulation was selected because we had a vapor-permeable weather barrier," he says. "Rigid foam would contradict that benefit."

Mostly zinc panels and some composite wood were installed on the medical park's façade. The facility is comprised of two connected buildings-a two-story structure housing urgent care, an outpatient diagnostic imaging center and ambulatory surgery center, and a three-story building with primary care and specialty physician services offices.

The Production Preparation Process helped the project team reduce the overall building size by more than 5 percent from the originally planned 134,000 square feet, and maintained all planned services. Lean principles were incorporated throughout the project including Last Planner System scheduling, prefabricating some building components, implementing workflow strategies, recycling and eliminating the traditional punch-list process. The project was designed and built using a fasttrack approach-four months from design start to groundbreaking. The owner, design team and contractor used an integrated project delivery approach that increased the speed to market for Providence Health Care.

Jarden Zinc Products, www.architecturalzinc.com

Knight Wall Systems, www.knightwallsystems.com