light coming in from the skylights, and it was an amazing space to walk into. I think it was a spectacular place to host the public meetings because you had the emotions of the place and the ability to visualize bringing it around to where it is now, as well as the immediate reactions of the public.” Although the community’s feedback reduced the
project scope by 60 percent, it didn’t reduce the challenges TLCD Architecture would face. The firm still needed to re- habilitate an extremely unique (and extremely dilapidat- ed) 8,300-square-foot round barn while maintaining its historic integrity and invisibly adding a kitchen, restrooms and storage, as well as integrating 21st century systems and audiovisual technology to ensure it would become a popular event space.
Structural Support DeTurk Round Barn is one of only two truly round barns
left in the state of California. Isaac DeTurk, one of Sonoma County’s first vintners, commissioned the barn in 1890 for his prize-winning racehorse, Anteeo. The barn’s old-growth redwood structure withstood two major earthquakes, but years of under-utilization had left it in a desperate state. By 2009, city officials feared a forceful windstorm would be enough to blow it over. As work began in late 2009, TLCD Architecture and its dedicated team of contractors and subs applied several structural solutions that will ensure the barn withstands another 100 years of northern California weather and earthquakes. First, the entire building was lifted off the ground for two months while the structure was reinforced and upgraded. “The rotting sill plate and about 6 inches of all the studs
were cut off to install a new pressure-treated sill plate while the foundation was poured,” Teel says. “A 6-inch curb was added around the outside edge, and we set the build- ing back on that. Because we poured a sidewalk around the whole building per ADA requirements, any water that drips off the roof—the building never had a gutter and was not allowed to have a gutter—is splashing against the concrete curb instead of the wood in the base of the barn.” The concrete curb was painted white so it disappears into the white wooden structure of the barn to maintain the barn’s status on the National Register of Historic Places and California Historical Landmarks lists. In addition, post-tensioning rods were added through-
out the 13-inch-thick foundation to help it withstand earthquake vibrations. “It’s an easy system that helps the barn float, in a sense, and also helps it from a lateral stand- point,” Teel adds. The slab houses electrical conduit and gas piping, as well as a radiant heating system. “Even though the barn wasn’t going to be insulated,
we wanted to have as low energy use as possible,” Teel says. “The radiant heating tempers the cold in the winter months. There are winter mornings here that can get down to the 20s and the system has done a good job
68 RETROFIT // May-June 2013
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