C o l d s p r i n g

Insight NewsletterSpring 2013

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San Francisco Public Utilities Building Shimmers in Granite and Glass

Stroll along the streets of downtown San Francisco and the classical old buildings tower above you, many in pure white granite. Most of the historic buildings in San Francisco are made out of Sierra White™ granite, and as you walk around the city, many of the curbs are still the original Sierra White granite.

So when the San Francisco Public Utilities Commission (SFPUC) needed a new building, the material to use was Sierra White granite from Coldspring. For the city of San Francisco, Sierra White granite is a legacy stone and has been used since the late 1800s.

The Sierra White granite is quarried out of Coldspring’s quarry in Raymond, California. This project was also fabricated at Coldspring’s fabrication facility in Raymond. The quarry’s location contributed in gaining LEED qualification sought by the owner and architect. The new 13-floor, 277,000-square-foot office building is slated to achieve a LEED Platinum rating from the United States GreenBuilding Council (USGBC).

Although just completed, the SFPUC project dates back to 1999 when the city bought the previous building on the site. The building had been sitting empty and dilapidated since 1989 when the Loma Prieta earthquake made it uninhabitable. Originally, the city planned to develop a multi-agency building, but the dot-com bust sidelined those plans. Instead the new SFPUC building was built on the site.

Materials Used:

Sierra White™ Granite 30,000 sq. ft. Diamond® 10 and Polish finishes

Building this structure called for a combination of styles. “What we tried to do is to create architecture that appeals to the neo- classical Civic Center Plaza

but also is clearly a building that looks to the future – aesthetically and technologically,” said Michael Rossetto, senior associate, KMD Architects. “Additionally, one of the primary goals we had was to build something sustainable –- to build something durable and beautiful so you’re not compelled to tear it down in 20 years.”

Specifically, the goal was to create a 100 year building, so durability of the materials was important. Using granite was the perfect transitional material between the newer innovations incorporated and the design of the civic center. Additionally, design called for a tremendous use of glass in the building and the granite provided a great anchor and balance with the glass.

A Diamond® 10 finish was used on the Sierra White granite, which was the closest finish to the existing buildings. “We took samples of the finish up to the existing surrounding buildings such as City Hall to try to find the

“Visiting the quarry, where the stone was coming from, and seeing their ability to cut and bevel the stone was impressive, it was a very rewarding experience, we learned a lot from it.”

Frank Sheng Senior Designer & Technical ArchitectKMD Architects

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San Francisco Public Utilities Building Shimmers in Granite and Glass

closest match. The Diamond 10 finish was the closest match,” said Rossetto. A polished finish was used on a horizontal decorative pattern at every floor, which provides a very subtle but striking effect, almost like glass.

KMD had worked with Coldspring on previous projects, but had not seen their operations first hand. For this project Frank Sheng, a senior designer and technical architect on the project, traveled to their quarry and Coldspring showed him the quarry, down to the precise spot where the granite slab would come from.

“Visiting the quarry, where the stone was coming from, and seeing their ability to cut and bevel the stone was impressive,” said Sheng. “It was a very rewarding experience, we learned a lot from it.”

“Coldspring helped us when we were focusing on the technological aspects of the stone,” said Rossetto. “We spent a lot of time studying the different corner joints, the pros and the cons on how the stone would meet at the corners, the ability of the stone to be cut and beveled, and anchoring to a curtain wall system.” Coldspring provided guidance and answers throughout the process.

“The most rewarding sensation is to look at this monument and know it will be around for another 100 years,” said Rossetto.

Watch our interview with KMD Architect Michael Rossetto

http://www.youtube.com/watch?v=uqAz_tHp780Click here for the full video:

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Coldspring recently provided more than 130,000 square feet of granite for the newly constructed Ralph L. Carr Colorado Judicial Center in Denver. Adjacent to the State Capitol, the 695,767-square-foot, $258-million Judicial Center encompasses courthouses for the Colorado Court of Appeals and Supreme Court, as well as a 12-story office building for support functions associated with the courts.

As a building material supplier with the capacity and ability to quarry and fabricate granite in the large-scale quantities required for the project, Coldspring provided 107,677 square feet of Iridian® and Rockville White® granite for the buildings and 24,138 square feet of Lake Superior Green® granite for the hardscapes. For the project, Coldspring provided in-house services including Building Information Modeling (BIM), consultation for the design team and natural stone from one source.

BIM’S critical role

Key to the project’s success was the use of BIM across the design and construction team, including key suppliers such as Coldspring. With BIM, digital 3D representations of

a facility’s physical and functional characteristics are shared and managed among team members through the project’s life cycle.

“The nearly universal adoption of BIM by members of the design and construction team helped make this project seamless,” said Martin Eiss, senior associate with Fentress Architects of Denver and project designer for the Colorado Judicial Center. “There was a lot more collabora-tion early on in this project,” said Eiss. “Coldspring was able to be on board from the beginning with BIM and coordinate essential details and planning in the early stages.”

With BIM, the team saved significant amounts of time. Coldspring showed its ability to be a member of the design team early in the design phase by modeling parts and pieces on the stone applications with the architectural team. BIM also allowed Coldspring to provide details in the shop drawings, which saved Fentress time in detailing shop drawings. In the field, general contractor Mortenson Construction of Minneapolis used BIM, which facilitated coordination and helped address potential conflicts before they arose. The Judicial Center opened two months ahead of schedule, thanks in large part to the team’s coordination and adoption of BIM.

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BIM Plays Crucial Role for Ralph Carr Colorado Judicial Center

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Materials and Selection

The Judicial Center was planned with a comparable design philosophy to the adjacent State Capitol. As such, materials were selected carefully to coordinate with those of the Capitol, making granite an ideal choice.

“The owner, Trammell Crow Company, and the State Judicial Department wanted the Judicial Center to represent the dignity of the courts and maintain a presence on the city’s civic center,” said Eiss. “Granite helps achieve these goals with its permanence and representation of dignity.”

Coldspring’s Iridian granite was selected for the Judicial Center’s exterior. “Iridian is wonderful material which is similar in color to the Capitol’s granite,” said Eiss. During the selection process, Coldspring consulted with the design team to ensure goals were met. The design team visited the Coldspring quarry to view slabs, observe quarry output and explore how Coldspring could meet the project’s needs.

“Coldspring has a large granite deposit and could accommodate the scope of this project,” said Eiss. “They also provided numerous samples and mockups throughout the course of the project to ensure design intent was met.” Coldspring fabricated four 52-foot-tall Iridian granite columns for the Judicial Center’s front entry and twenty-four radial-clad Iridian granite columns outside of the Learning Center, an interactive space for the general public to learn about the judicial system’s history.

The entire four story court building is clad with granite. Rockville White was used as a base up to

The Grand Corridor features a mural including images of the Coldspring Iridian quarry, where the building’s facade was quarried. Artist Amy Baur, from InPlainSight said “It just made sense to show the raw material that created the gorgeous facade to be shown in the corridor since it was such a conceptually great example of hard work and perseverance resulting in something valuable and honorable.”

Materials Used:

Iridian® & Rockville White® Granite 107,677 sq. ft. Thermal & Honed Finishes

Lake Superior Green® Granite 24,138 sq. ft. Thermal & Honed Finishes

the second floor and Iridian was used above that. The first two floors of the adjoining 12-story office building is clad in Rockville White granite, with precast panels above the 2nd floor. Coldspring coordinated with Gage Brothers Precast, Sioux Falls, S.D., for this installation.

Coldspring coordinated with The Gallegos Corporation, the stone and masonry contractor from Denver, for the portions of the granite that needed to be hand-set. The building’s corners were hand-set to wrap the corner with stone and provide the look of a solid-stone, with no joints showing at the corners.

Grand Corridor Art features Iridian Quarry

Inside the Judicial Center, the building’s Grand Corridor features a mural constructed of ceramic tiles and low-relief hand-built ceramic art forms. Entitled, “This Promises Water,” the mural includes images of the Coldspring Iridian quarry where the granite for the building’s façade and columns was quarried. Amy Baur of InPlainSight Art, Minneapolis, Minn., devel-oped the concept which features 1,168 10- by 20-inch ceramic tiles, laid out on two walls -- one 30 feet long and the other more than 90 feet. Sources for the artwork include historical and contemporary photographs, native botanical illustrations and vintage drawings.

Story continued on next page...

Photos courtesy of: Bryan Lopez Colorado Judicial Department

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“It just made sense to show the raw material that created the gorgeous facade to be shown in the Grand Corridor since it was such a conceptually great example of hard work and perseverance resulting in something valuable and honorable,” said Baur.

Choice text is embedded throughout the work, and Baur selected words with dual meanings that extend the content on which the artwork is built: perspective, steady, level, humility, gravity, courage and wisdom.

Hardscape Maintains Building’s Stature

Civitas Inc. designed the Judicial Center’s hardscape to provide the same stature as the building. The Denver-based landscape architecture firm selected Coldspring’s Lake Superior Green for the surfaces, including the plinth on which the building rests.

“We couldn’t place a building like this on just a concrete base,” said Craig Vickers, principal, Civitas. “The plinth, or podium-style, base anchors the building to the ground and gives it a prominent architectural foundation.”

As the plinth cascades down to the street level, it engages the community by offering seating areas for viewing parades and other events along the adjacent Civic Center Park. What’s more, the west and east sides of the plinth’s bleacher-style steps serve as storm water detention/water quality ponds. As such, the east and west sides define the planted environment to soften the building and give it a garden-like quality.

Granite slabs measuring 2 feet thick construct the plinth. Vertical surfaces feature a honed finish, while the horizontal surfaces have a thermal finish. “We selected different finishes for the plinth to allow light to react to the different surfaces and give emphasis to vertical,” said Vickers.

Beyond the plinth lies the plaza area, constructed of 3-inch-thick slab granite, soft-set on sand with a mechanical snow-melt system underneath to withstand Denver’s harsh freeze-thaw conditions. All walking areas feature a thermal finish for non-slip surfaces. Throughout the hardscape design and installation,

Coldspring provided assistance to the team. Complex geometries had to come together piece by piece, and BIM once again proved essential to success.

“We used our 3D Autocad modeling, and then we created 2D plan shapes,” said Vickers. “During the shop-drawing process, Coldspring used our 2D plan shapes to create the BIM model that was tied together with the general contractor’s BIM model,” said Vickers. “This project demonstrates that the sooner you model these pieces, the sooner you know where potential issues are. We were able to identify challenges early instead of in the field.”

Design for the Future

Designed with a 100-year-plus lifespan, the completed Ralph L. Carr Colorado Judicial Center speaks to the future in terms of court-room design and technology, with the flexibility to accommodate future needs. Low- maintenance, long-lasting materials such as granite were selected to stand the test of time.

“This project demonstrates the more we can integrate BIM early on, the more successful a project can be,” said Eiss “The relationship with the subcontractors and suppliers such as Coldspring were critical -- all were engaged in the design phase, which proved essential to this project’s success.”

“During the shop-drawing process, Coldspring used our 2D plan shapes to create the BIM model that was tied together with the general contractor’s BIM model”

Craig Vickers Principal Civitas Inc.

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