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Rainscreen façade changes with daylight

Mark Miller, RA, associate at Erdy McHenry Architecture LLC, says the design goal for Marriott International Inc.'s Courtyard Philadelphia South at the Navy Yard in Philadelphia was to maintain the established façade curvature that faces the on-site park and ensure daylighting and views for all guestrooms.Mark Miller, RA, associate at Erdy McHenry Architecture LLC, says the design goal for Marriott International Inc.'s Courtyard Philadelphia South at the Navy Yard in Philadelphia was to maintain the established façade curvature that faces the on-site park and ensure daylighting and views for all guestrooms. "The exterior of the building at the guestrooms is clad in a metal composite material rainscreen system, giving the building an ever-changing skin that depends upon the time of day and amount of sunlight," he says. "The rainscreen creates a system to reduce the building's overall heat gain by using a series of sub-girts and custom aluminum clips to prevent transfer of heat to the building subframing."

Towne and Country Roofing Inc. installed Citadel Architectural Products Inc.'s Envelope 2000 metal wall panels with RainScreen attachment system. The Envelope 2000 was built with approximately 30,000 square feet of metal composite material in Silver Metallic and two custom Silver shades at various depths.

Miller says his firm started the project with a complete palette of materials. "We tend to lean toward metal because it provides more flexibility than bricks or other materials," he says. "We can design façades with undulation, panel depth. Other materials tend to leave you with a flat façade."

Todd Mentasti, estimator at Towne and Country Roofing, says his company's crew had to pay extraclose attention to the drawings while installing the fabricated multicolored panels at various depths. "Some were installed 2 inches out from the deck, some 5 inches out and some at 7 inches," he says. The curved portion of the building at the main entrance was constructed with small segments; panels and windows were not curved. Mentasti says some panels were 4 feet wide; most were smaller than that. "It takes more time to install more panels, but it was worth it to achieve the curved appearance," he says. "Curving longer panels would have required more time and they wouldn't have looked the same as these segmented panels."

The five-story, LEED-certified hotel was completed in January 2014. Its ground floor features a dining, bar and lounge facility, fitness room and more than 2,000 square feet of meeting space.

Architect: Erdy McHenry Architecture LLC, Philadelphia
Installer: Towne and Country Roofing Inc., Bensalem, Pa.
Metal wall panels: Citadel Architectural Products Inc., Indianapolis, www.citadelap.com