Posts tagged with "LEED":
New York’s enormous Javits Center could grow $1 billion larger with Cuomo’s plan and FXFOWLE’s design
Old and new technologies combine in renovated anthropology building.Tasked with transforming Harvard's 1971 Tozzer Library into a new home for the university's Anthropology Department, Kennedy & Violich Architecture (KVA) faced a unique set of challenges. In addition to balancing the desire for a distinct architectural identity with the building's literal and metaphorical connection to adjacent structures including Peabody Museum, the architects had to accommodate an expanded program within the old library's footprint and structure. As for Tozzer Library's facade, a mold problem and poor environmental performance meant that preserving the brick exterior was never an option. "It's a generic problem of envelopes from buildings that aren't that old, yet can't stand up to contemporary needs," said principal Sheila Kennedy. "What are you going to do with those buildings? The bold approach here was, 'we're going to build on [the existing] value." By stripping Tozzer Library down to its steel and concrete-slab bones, adding space under a two-story copper roof, and wrapping the exterior in a parametrically-designed brick skin, KVA seamlessly negotiated between Harvard's storied past and the mandates of a 21st-century curriculum. Both Kennedy and founding principal J. Frano Violich are quick to dismiss the notion that the problems with the 1971 building, designed by Boston firm Johnson, Hotvedt and Associates, were anything other than a product of their times. "Attitudes toward energy consumption were very different at the time," said Violich. "[Tozzer Library] was built by intelligent people, but everyone's understanding was different from today." In contrast, he said, for the new Tozzer Anthropology Building, "everyone was on top of every [LEED] point." (The project achieved LEED Gold.) KVA began by substituting 6-inch wall studs for the original 2 1/2-inch studs, making way for improved air circulation and insulation. In addition, they eliminated the potential for mold growth by increasing the air gap between the outside sheeting and the back of the brick veneer from 3/4 inches to 2 inches. With the mechanics of the exterior walls in place, "the challenge, aesthetically, was how do we get a sense of both thickness and thinness in the veneer?" said Violich. Luckily, the question of how to breathe new life into flat surfaces was nothing new for the architects. "At KVA we've been very interested in how one designs with contemporary wall systems, with materials that are thin," explained Kennedy. "How do we express their thinness, but by architectural means and devices give them an architectural thickness, manipulate them formally so there can be a game of thin and thick?" In the case of Tozzer Anthropology Building, the answer was a new entrance pavilion with a three-dimensional brick pattern meant to "seem like carved thick brick—like an archeological find," said Kennedy. Drawing upon their early experiments with digital brick, including those at the University of Pennsylvania Law School building, the designers used parametric design software to tie each brick unit to the building's overall form. "As we manipulated the physical form in 3D, we could see various brick patterns that could develop," explained Kennedy. "It was a hybrid of low-tech and high-tech," she said of the process of zeroing in on corbeling, a brick-stacking technique that allows for overhanging layers. The digitally-derived corbeled texture complemented the depth of ornament found elsewhere around Harvard's campus. "We didn't want to make something that was arbitrary and ornamental, but something that was authentic to our time," said Kennedy. To arrive at a final design for the multi-story entrance wall, the architects again combined cutting-edge technology with traditional expertise. "The actual pattern was achieved through physical experimentation," explained Kennedy. "We did a lot of dry stack work with local masons: We would take the designs out of the computer, then pass them to the masons to test. That was a really fun part of the process." KVA then took what they learned from their real-life experiments back into the virtual world, adjusting the digital design accordingly. Even the flat facades appear unlike typical brick walls, thanks largely to an unusual window arrangement. "When you're looking at the windows, you're not looking at traditional punch windows, or a strip window with a long relieving angle," said Violich. Rather, the windows are shifted to conceal the vertical control joints in the brick. "That helps defuse the veneer quality that brick sometimes brings on," he explained. The floor-to-floor windows further confound expectations by concealing the plenum and—because they are frameless, and punch out rather than in—appearing as much like light monitors as the actual skylights cut into the building's roofline. Tozzer Anthropology Building's recycled-content copper roof completes the dialogue between thick and thin established on the brick facades. "We worked hard in the massing of the design to give a twist to the building," said Kennedy. "That could really only happen in the two new floors." KVA textured the copper roof with vertical standing seams, again using parametric software to arrange different panel types in a corduroy-like pattern. "A lot of times people think advanced facades are super technical, but we can get lost in the technology and why we're using it," observed Kennedy. "[This project] is a good combination of an aesthetic agenda, an architectural agenda, and a technical agenda." For KVA, Tozzer Anthropology Building represents more than just a repurposed campus building. Rather, it offers a provocative answer to one of today's most pressing questions: how to rectify an inherited aesthetic preference for glass with the current push for improved energy efficiency. "Everybody loves glass—we love transparency in architecture," said Kennedy. "But as we move on in our energy transition, we're going to have to develop new ideas about mass and opacity. How can we go back to a pre-modern time, but create something that is contemporary?"
Ultra efficient curtain wall system marries transparency and sustainability.For some institutions, building "sustainably" means doing the bare minimum—checking the boxes of government or in-house requirements and then moving on. Such was not the case at Colorado State University, where campus officials aspired to a higher standard for the new Suzanne and Walter Scott, Jr. Bioengineering Building. Though mandated by state law to achieve LEED Gold on new construction, the dean urged the architects—design architect RATIO Architects and architect of record Hord Coplan Macht (previously SLATERPAULL)—to aim for Platinum. At the same time, school authorities placed an extra emphasis on a tight envelope, having had difficulty maintaining pressurization in another recently-constructed facility. Thanks to a combination of an ultra-efficient curtain wall system, spray foam insulation, and exterior and interior sunshades, the designers exceeded the client's performance expectations without sacrificing the program's focus on visibility and connectivity. The ultimate goal of achieving LEED Platinum directly shaped the facade of the classroom and office building. "[The dean] wanted to get to Platinum," recalled Hord Coplan Macht's Jennifer Cordes. "We knew the only way to get there was if we had a significant building envelope designed to add photovoltaics." The PV panels themselves would have to wait, due to budget constraints. In the meantime, Hord Coplan Macht focused on two other challenges: the desire to prevent any loss of pressurization; and the need to rectify the design architect's vision of a glass box with the reality of the Colorado climate. "When we added these issues together, we had to get creative with the building envelope," said Cordes, who also acknowledged the role local municipal rebates played in incentivizing a high-performance design. The design concept for the Suzanne and Walter Scott, Jr. Building, said Cordes, "was to create the space in between. The space between the research laboratories and the student classrooms was really where the students were going to learn from the researchers." The architects arranged the labs along the north side of the building; faculty offices and teaching spaces line the south elevation. The programmatic separation allowed them to sequester the two components' mechanical systems—a boon to efficiency—and to carve the center of the building into a naturally-ventilated three-story atrium that is a perfect space for casual interactions among students, faculty, and staff. Elsewhere, the focus on connecting students with faculty and researchers is materialized in large expanses of glass. Hord Coplan Macht's principal challenge was to rectify the emphasis on transparency with the mandate to minimize thermal gain. "We started to look at the window to wall ratio," recalled Cordes. "Our first [number] was outrageous. [So we looked] at how we could insulate a curtain wall system and get an R-value of 20 even within that." The solution, which the architects developed in concert with Kawneer, involved back-panning, adding polyiso behind all the spandrel glass to effectively decrease the window to wall ratio. They then added a sheet metal back-panning system inside the curtain wall frame for vapor barrier, plus insulation and GWB. Large panes of stone backed with spray foam insulation provided additional energy savings. "Spray foam insulation is very cost-effective, and you get a high R-value per inch," explained Cordes. "It allowed us to get some significant walls into our system." On the vulnerable south facade, the architects deployed both external and internal sunshades. On the exterior, an integrated sunscreen helps cut back on solar gain. On the interior, the designers sloped the ceilings to help bounce light into the space. The internal light louvers they used, which Cordes compares to "good-looking mini blinds," are "pretty impressive and work really well," she said. The interior shading system "managed the glare and also increased the daylighting, pushing light deeper into the space." All of the exterior glass carries a low-e coating, but the architects chose a higher visibility glass for use on the south facade, to further enhance daylighting. Installing the thermally broken Kawneer 1600 curtain wall system proved trickier than Hord Coplan Macht had anticipated, said Cordes, in part because the contractors—working during the winter—installed the back panning from the inside out, rather than the reverse. But the extra coordination was well worth it, as the project's LEED scores and post-occupancy energy and water use data have demonstrated. "With the caveat that the building is being used a little more than was projected in the model, it's performing better" than expected, said Hord Coplan Macht's Ara Massey. "Per the facilities manager, it's one of the best performing buildings on campus." For Cordes, no reward could be greater. "I think the one [thing] we're most proud of is that it's performing so well," she said.
Curved metal facade embodies spirit of mobility at LAX.The commission to design a new Central Utility Plant (CUP) for Los Angeles International Airport (LAX) came with a major caveat: the original 1960s-era CUP would remain online throughout construction, providing heating and cooling to adjacent passenger terminals until the new plant was ready to take over."We had to keep the existing CUP up and running, build the new one, do the cutover, then tear down the old CUP and build a thermal energy storage tank in its place," explained Gruen Associates project designer Craig Biggi. "It was a very challenging project from that standpoint—working in a 24/7 environment, and getting everything up and running within a small footprint." But despite these and other hurdles, the design-build team (which included Clark/McCarthy, A Joint Venture as general contractors, Arup as A/E design lead, and Gruen Associates as architect) succeeded in delivering the new CUP in time to support LAX's newest terminal. Its curved stainless steel and glass facade captures the airport's spirit of mobility, and helps restore a sense of cohesion to an otherwise fragmented built landscape. LAX is a busy place, both aesthetically and with respect to passenger movement. "There's a lot of visual activity happening there," explained Biggi. "It's been built up over time, so there's this layering effect. This was meant to be an architectural design that not only simplifies some of the visual confusion, but addresses the context of the airport itself as a site that has a lot of movement." When shaping the building envelope, the designers looked at concepts of laminar flow, of which one example is the passage of air over an aircraft wing. "What we came up with was a streamlined architectural expression that ties together three distinct programmatic elements," said Biggi. "The project uses this expression to tie into the existing context by flowing around corners, then opens up at certain locations to allow the program to have ventilation and views." The CUP's primary facade is clad in stainless steel composite panels within a pressurized rain screen system. The architects chose stainless steel, explained partner-in-charge and project manager Debra Gerod, to respond to the potentially corrosive effects of jet fuel and other chemicals as well as the salty Southern California air. In addition, "we had to work to get a finish that wouldn't create reflections," said Gerod. "We're right underneath the control tower. Being mindful that the sun can be at any angle, bouncing off airplanes, that [became a] careful performance-based element" of the design. Non-curved sections of the CUP's envelope feature corrugated aluminum panels, which reduce the risk of reflection and help camouflage functional components including large doors that allow the installation and replacement of equipment. "How we were able to put these giant openings into the side of the facade and have it be blended in and aligned with the corrugated metal paneling—these were some of the things we really paid a lot of attention to," said Gerod. Similarly, the ribbon windows on the stainless steel facade help conceal exhaust louvers, in addition to providing views from the engineers' offices. "We always looked at opportunities for streamlining the aesthetic of the exterior," said Biggi. "We were looking for simple massing that looked fluid in its resolution." Gruen Associates designed the new CUP as a visual landmark for passersby, installing a massive window on the north facade in order to reveal the interior of the chiller room. "This is a bit of an homage to the old CUP," explained Gerod. "When it was first built, it was a really nice building: round, with lots of glass. By the time we got to it, things were spilling out in all directions. But as originally designed, it had a view into the inner workings of the plant." Meanwhile, the architects used blue-colored LEDs and reflectors moved by the wind to create a lighting effect on the adjacent thermal energy storage tank—which, like the nearby cooling towers, is also clad in stainless steel—that mimics the rippling motion of a swimming pool at night. "The lighting effect is meant to address passengers as they're driving down Center Way, and give some animation to the large mass of the storage tank," said Biggi. Here, too, the designers were careful to plan the lighting so as not to interfere with air traffic control functions. LAX's new CUP, which is targeting LEED Gold certification, promises a 25 percent increase in efficiency over the 50-year-old plant it replaces. With continued expansion in the offing, it did not arrive on the scene any too soon. Though much of the design was shaped by current conditions at the airport, including both functional considerations and an aesthetic embrace of the airport's hectic pace, Gruen Associates simultaneously thought ahead, to a larger—but hopefully visually more coherent—LAX. Should a proposed terminal extension to the west come to pass, the CUP's curved stainless steel facade will provide a backdrop for the newer buildings, setting the stage for a more deliberate approach to the airport's ongoing transformation.
Faceted facade evokes regenerative prairie burns.For most projects, admits VernerJohnson's Jonathan Kharfen, architects steer clear of evoking a potentially destructive force like fire. But Museum at Prairiefire, the American Museum of Natural History (AMNH) outpost in Overland Park, Kansas, proved an exception to the rule. Because Prairiefire houses AMNH's traveling exhibits, its content is constantly changing, and thus provided little guidance in terms of an overarching design concept. Kharfen instead looked to the location. "What is the area about?" he asked. "For me the first thing that came to mind were the prairie burns. Coming from Boston, I'd never seen anything like it." Using dynamic materials including dichroic glass and iridescent stainless steel, VernorJohnson crafted a faceted high performance envelope that embodies the color, movement, and regenerative power of fire. Not long after landing on the fire metaphor, said Kharfen, "I knew of a couple of materials that would be perfect, because for me it's all about movement and light." He began researching dichroic glass, a composite glass that changes colors depending on the angle of view. The museum's sustainability goals—the project is targeting LEED Silver—dictated that the material would double as an insulating unit, the first such application in the United States. But that presented an additional challenge, as products with the dichroic properties embedded in the glass itself would break the budget. To lower costs, the architects collaborated with fabricator Goldray Industries to design an assembly incorporating dichroic film from 3M. The solution turned out to be an aesthetic boon as well as a cost-cutter, as the film itself carries a flame-like pattern. "It's subtly dimply, it's animated, it's beautiful," said Kharfen. Kharfen's team paired the dichroic glass with a second shape-shifting material, Light Interference Coated (LIC) stainless steel, ultimately applying panels in a variety of color and finish combinations. "With the stainless steel, I wanted to create [the appearance of] flame bursts and sparks," explained Kharfen. "I didn't want to apply it in a random way." Instead, the architects arranged the panels in a gradient, with blue (near the bottom) giving way to burgundies and reds and finally to golden yellow. For Kharfen, it was not enough that the materials themselves convey a sense of life and movement. "I wanted them to be dynamic shapes, dynamic in plan as well as in elevation," he said. His solution—a faceted curtain wall—upped the project's technical ante. To avoid cluttering up the lobby space with columns, Kharfen worked with structural engineers Structural Engineering Associates to design a custom support system of stainless steel tubes fronted by angled mullions, to which the curtain wall is attached as a veneer. To accommodate the 14 unique angles involved in the faceting, curtain wall manufacturer Kawneer developed a new adjustable mullion, a hinged plate with a 180-degree range of movement. Given the museum's ever-changing content, the architects treated the exhibit spaces as "black boxes," said Kharfen. "For the solid areas I wanted to evoke the overlapping, curved forms of the hills." The client, Fred Merrill of Merrill Companies, loved the stonework at VernorJohnson's Flint Hills Discovery Center in Manhattan, Kansas, which suggests striated rock formations. "He asked, 'Can't we just do that here?'" recalled Kharfen. "I said, 'No, we're going to do something different.' I wanted a gradient." To cut costs and simplify installation, the architects whittled a more complex scheme down to a mix of two different stones in each band, with the bands varying in width. Again, the referent is fire: the walls begin with a charcoal-colored architectural cast stone before moving through Kansas limestone in shades of red, brown, gold, and off-white. Together, the stone-clad exhibit halls and the lobby curtain wall complete the picture of a prairie burn. "I wanted the fire elements to engulf and connect the solid volumes," said Kharfen. "I did them as lines of fire, because, historically, that's how these fires were set." But while the burn metaphor extends to every level of detail, including the flicker-flame-inspired sloping at the tops of the doors and windows, for the project architect the museum design ends where it began: with the primary materials. Speaking again of the dichroic glass, he concluded, "I cannot think of a material that looks more like fire than this glass."
Boston launches a sustainable housing initiative with net-zero energy townhomes.As anyone who has come into contact with Red Sox Nation knows, Bostonians tend not to believe in half measures. A case in point is the city's E+ Green Building Program, a joint initiative of the Office of Environment & Energy Services, the Department of Neighborhood Development, and the Boston Redevelopment Authority. Designed to demonstrate the feasibility of building net-zero energy, multi-unit housing in an urban context, the program made its built debut in 2013 with 226-232 Highland Street, a development consisting of four three-bedroom townhomes in Boston's Roxbury neighborhood. The building achieved substantial energy savings on a tight budget in part through a highly insulated facade constructed from conventional materials. "The envelope is key," explained Interface Studio Architects (ISA) principal Brian Phillips. "We design many super high performance projects and we believe strongly in the quality of the envelope as the starting point." ISA became involved in the project at the invitation of developer Urbanica, who had seen their 100K Houses, a high performance housing prototype designed to be constructed at less than $100 per square foot. One of three winners of the E+ Green Building Program's developer design competition, the Urbanica-ISA team crafted the townhomes with a dual awareness of the project's immediate surroundings and efficiency goals. "We're always interested in observing and measuring the context in order to create our design approach," said Phillips. "The materials and shapes of the Roxbury neighborhood inspired our design—as well as the requirements of creating a super high performance building." For instance, he describes the facade's most distinctive feature, a recessed vertical stack of windows, as "a riff on the prevailing bay window typology." The architects' material choices "were motivated by aesthetics, affordability, and recycled content," said Phillips. The primary facade material, prefinished fiber cement lap siding, is common to the neighborhood's existing residential fabric. Each attached house features an interlocking pattern of grey-blue and cedar-textured siding, for contrast, while the reverse bay windows are wrapped in dark grey metal panels. Double-stud walls, blown in insulation, and super tight doors and windows reduce thermal gain to a bare minimum. Thanks to its high performance envelope, energy-generating rooftop photovoltaic panels, and integrated user-feedback system, 226-232 Highland met the E+ Green Building Program's concrete goals, earning LEED Platinum for Homes certification and HERS Index scores between -11 and -15. Even during the unusually cold winter of 2013-2014, the Boston Redevelopment Authority reported, the project recorded energy positive days. But the townhomes also fulfilled the less tangible component of the city's mission, as a demonstration that sustainable housing can be built simply and for a reasonable price. "Green development is no longer just the big high-rises and large projects downtown," said Boston Redevelopment Authority deputy director Prataap Patrose at an event celebrating the building's LEED Platinum certification. "It's happening here. It's happening in our neighborhoods."