Posts tagged with "Arizona":
LEED Platinum renovation reconnects the Health Services Building to the campus core.Early in their renovation of the Arizona State University Health Services Building, Lake|Flato Architects, working with orcutt | winslow, decided to scrap the university’s initial concept in favor of a plan that would reengage the campus’s historic pedestrian corridor, the Palm Walk. Instead of building an addition to the north side of the existing facility, which included a serviceable two-story building constructed in the 1950s and another structure Lake|Flato partner Andrew Herdeg described as "a rambling one-story rabbit warren of spaces," the architects elected to demolish the one-story wing and build a two-story addition in its place. "This initial idea that we need to look at the basic concept before we start the design, and think about it from the campus design perspective, changed everything," said Herdeg. It allowed the design team to reduce the program by about 12 percent and reduce the footprint by 20 percent, as well as to preserve 5,000 square feet of green space for programs and stormwater mitigation. But it also presented a challenge. The renovated building’s primary identity would be on the east facade of the building, where the desert sun had the potential to undo efficiencies gained elsewhere. Lake|Flato and orcutt | winslow responded with a building envelope that provides a strong visual connection to the Palm Walk while reducing solar gain to the absolute minimum. The architects wrapped the south and west sides of the addition, where the clinics are located, in a tight brick over rigid fiberglass insulation. "The brick picks up on some surrounding historic buildings, and is also a traditional material for the campus," said Herdeg. The designers articulated the east side of the building with a series of bays and adjacent pocket gardens. The bays are oriented to the south and southeast, rather than due east, with the glazing on their south facets. "Instead of thinking about engaging the campus in a frontal way, we always thought of approaching this building on the diagonal," explained Herdeg. "Thinking about how the pedestrian perceives it helped us strategize about solar assets and thermal loads." The unglazed portions of the bays are clad in a metal skin, behind which an inch and a half of rigid insulation serves to eliminate thermal bridging. The articulated facade is designed to self-shade as the sun rises. "We worked on a series of pretty rudimentary daylighting studies that allowed us to look at the spacing of the bays," said Herdeg. "We did this balancing act between creating little pocket gardens, and using the adjacent bays to self-shade the glazing on the bays next to them." The design team installed corrugated metal overhangs over the bay windows to provide additional protection from direct sunlight. A series of recycled wood pulp and plastic screens from Trex, installed over the bay windows and over some of the glazing on the south and west sides of the building, constitute a final layer of defense against the Phoenix sun. "The Trex louver system allowed the solar thermal to be picked up on the lattice rather than the building skin; it was another barrier to the thermal load," said Herdeg. "The lattice also supports vines that are going to grow up, so these pocket gardens get surrounded by lush vine-covered walls." Likewise, on the new building’s two other facades, "the thought was that each of the little patient rooms would not be looking out at parking, but at a green screen," he explained. Lake|Flato and orcutt | winslow’s LEED Platinum intervention, which included replacing all the single-pane windows in the 1950s building with low-E insulated glass, will surely save ASU substantial sums on its energy bills. More importantly—thanks to the designers’ decision to demolish the inefficient one-story wing—it weaves the Health Services Building back into the campus fabric. "Now the building really addresses the campus," said Herdeg. "Before it had this very disjointed identity. Now we’ve created a cohesive identity with a single entrance. It’s a much better solution."
Glass and corrugated metal envelop a Scottsdale cycling shop.When debartolo architects principal Jack DeBartolo 3 AIA first visited the site of Bicycle Haüs in Scottsdale, he knew it was exactly what owners Shasta and Kale Keltz were looking for. "In Arizona, with our very intense heat, we love it when we can unite two things: a northern orientation to maximize light without direct sun, and high visibility to the public way," said DeBartolo. "When a parcel's oriented like this, with its main side facing north, it allows us to do both things in one. We can build a glass facade for light and to advertise the contents, and it can also be a view building." DeBartolo's firm designed a wedge-shaped structure with a broad structural glass facade facing the street. The remainder of the building is clad in weathering steel, a low-maintenance material that taps into the desert aesthetic of decay and renewal. "The concept for the building was all about its orientation, and its place, and its environmental response," explained DeBartolo. The architects chose a wedge form for the 5,000-square-foot showroom for several reasons. First, they wanted to maximize glazing on the north-facing facade. "With the shape of the building we collect that northern light and pull it deeply into the building," said DeBartolo. "In the desert, we get a lot of our intense sunlight bouncing off the ground. It also bounces off the ceiling inside the space, so often there's almost no electric light needed in this room." In addition, the building's massing pushes its activity to the street rather than to the back of the lot. Finally, the architects designed the wedge form and a gently sloping roof to someday accommodate solar panels. The 48-foot-wide, 30-foot-tall structural glass wall on the north facade was the product of careful coordination among the architects, engineers, and installers. "What we love, and where we often say less is more work, is that in Arizona we can attach the glass directly to the structural shell using a liquid affixing system," said DeBartolo. Steel tabs welded to the ends of a series of 2-inch-by-6-inch structural tube steel columns receive six-foot-wide panels of low-e insulated glass. Since the glass and steel erectors work with different tolerance levels, explained DeBartolo, "getting them all on the same page early on takes a pretty significant learning curve. You're pushing construction to the max, but we love the overall quality we get when we've literally just glazed the structure." The bicycle shop's mezzanine level cantilevers ten feet over the entrance to create a shaded porch. In addition to providing a space for cyclists to gather before and after rides, the porch "encourages sidewalk activity along First Avenue," said DeBartolo. "That's an important criterion that Scottsdale's trying to push." Corrugated box rib cold-rolled steel, fabricated by Gen3, envelops the building's east, south, and west facades. "The idea was to economize the skin and create a really well-insulated building," said DeBartolo. The architects liked that the steel was available in 30-foot runs, allowing them to avoid horizontal seams. They also wanted "something with aesthetic richness," said DeBartolo. "We try to do everything we can to avoid painting buildings. This weathering steel allows the building to continue to enrich itself as time passes." At the southwest corner of the lot, where team members enter through a back door, debartolo architects carved a notch out of the building's massing, replacing the corrugated envelope with galvanized flat panels affixed with VHB. "We allowed the interior when we cut it away to remain galvanized," explained DeBartolo. "It creates relief, visually, from the harsh exterior." The designers incorporated custom slot windows into the metal facades. "They work really well with our strong western light," said DeBartolo. "We just get little strips of lights rather than a large mass that creates heat gain." The windows are arranged so that they hit the corrugation pattern at the same place every time. They are also integrated with the interior displays, moving up and down to make way for racks of merchandize. "It was very thought through, very methodical, though it created something that almost looks random," said DeBartolo. The architecture of the Bicycle Haüs embodies the owners' passion for cycling. "They really pride themselves on staying state of the art with respect to cycling," said DeBartolo. "In much the same way they wanted the building to really respond to that. Furniture and fixtures define the movement of people, but the space is a lofty room that's almost a gallery for bicycles."
Red-rock mountains and the saguaro cactus inspired the Health Sciences Education Building's rippling copper facade.Downtown Phoenix, observed CO Architects’ Arnold Swanborn, looks a lot like downtown Minneapolis. That feels wrong, given the two cities’ contrasting environments. So when it came to designing the Health Sciences Education Building (HSEB) at Phoenix Biomedical Campus (which won honorable mention for facades in AN’s Best of Design Awards), CO Architects went back to nature—to the Sonoran Desert in particular. “We’re building in a desert. We really, in the outset, wanted to understand what it’s like to build in a desert environment, to really go back and investigate the people who first moved there, or even some of the [American] Indians who lived [there],” said Swanborn. “The skin is really a response to some of the lessons we learned from going out to the desert, being out there and seeing how plants and animals adapted to that environment.” HSEB’s undulating envelope, comprising 5,972 copper panels and more than 10,000 copper parts, echoes two of the defining features of the Arizona desert. First is the omnipresent saguaro cactus, which evolved a folded skin as a self-shading structure. Second is the layered soil of the nearby mountains. “[T]he [building’s] skin folds in a way that’s similar to the saguaro cactus,” explained Swanborn. “How we emulate the mountains beyond is by creating a shadow pattern by folding and articulating the metal panels.” Copper was a natural choice for the exterior cladding. HSEB went up during the recession, said Swanborn, “when everyone was very sensitive to making sure everything was local.” Copper is one of Arizona’s “five C’s”: copper, cattle, cotton, citrus, and climate. In addition, copper is highly conductive, meaning it responds quickly to the region’s aggressive swings in temperature. “Because it’s a rain screen technology we innovated into a sunscreen, there’s a space between the copper skin and building envelope,” said Swanborn. “There’s a 2 ½- or 3-inch air cavity that essentially acts as a chimney. The air gets superheated, and it essentially creates a vertical convection effect, which wicks heat away from the building.” On a 100-degree day, the copper skin keeps the interior a (relatively) cool 70. Finally, copper ages well. “Over time it patinas beautifully,” said Swanborn. “It’s easy to take care of; it kind of takes care of itself.” Phoenix’s climate informed every aspect of the exterior design, starting with the massing. CO Architects worked with Transsolar to determine a shape that would maximize shading. The building is arranged around a narrow courtyard running from east to west, which the architects modeled on the Sonoran desert’s slot canyons. The courtyard is topped with a polytetrafluroethylene (PTFE) shading structure, which “allows daylight to filter through—sort of like a big lightbulb,” said Swanborn. “It filters, diffuses, and bounces off the interior’s light-colored walls.” The courtyard walls are faced in Trendstone ground face masonry units by Trenwyth, a light block rain screen used as a veneer. The courtyard helps bring light to HSEB’s east and west faces, which CO Architects left windowless in order to reduce thermal gain. On the south side of the building, they installed cantilevered copper sunshades over the windows. Vertical copper fins on the north elevation shade occupants from the rising and setting sun. Like the building’s copper cladding, the sunshades and fins were fabricated by Kovach. To open the ground floor on the west end of the building to the adjacent campus green, CO Architects took a cue from early desert dwellers. “When the [American Indians] first settled, they built underneath these carved rock formations, which again becomes self-shading,” Swanborn. The ground floor is glazed, but set back under the building to reduce direct exposure to the sun. Swanborn relished the challenge the joint University of Arizona/Northern Arizona University project provided. “To me the story’s really about the idea of creating a new urban vernacular for the desert,” he said. “The more restricted things become, [the more] architects have to become inventive. The skin of the building is really a pointer to that: it’s inventive, it’s innovative. I think it’s very fitting for that area.”