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    188宝金博页面版: PRESERVATION Tech Notes - NPS

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    内容提示： DELA W ARE BUILDING Chicago, Illinois The Delaware Building was con-structed shortly after the Chicago Fire of 1871 using pre-cast concrete panels on the outside. Originally six stories in height, the Italianate-style office building received an additional two floors around 1890 that were faced with sheet metal to resemble the ap-pearance of the facade below. The lower two floors were originally dressed with ornamental cast iron arches. Later removed, they have been recently restored. Individually listed o...

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    DELA W ARE BUILDING Chicago, Illinois The Delaware Building was con-structed shortly after the Chicago Fire of 1871 using pre-cast concrete panels on the outside. Originally six stories in height, the Italianate-style office building received an additional two floors around 1890 that were faced with sheet metal to resemble the ap-pearance of the facade below. The lower two floors were originally dressed with ornamental cast iron arches. Later removed, they have been recently restored. Individually listed on the National Register of Historic Places, the building has an impressive interior atrium that sur-vives, providing light to offices on the upper floors. The windows are set in a deep reveal, paired in an alternating pat-tern of wide and narrow bays. The wooden sash are double hung and most have arched tops. The window openings are richly detailed with keystones, flanking columns and heavy surrounds, and are separated in pairs on most floors by various pilaster treatments. As part of the rehabilitation of the building in 1982, the existing wooden windows were repaired, weatherstripped and retrofitted with an additional sheet of glazing using a technique that per-mitted creation of sealed insulating units in each sash. Rehabilitation Problem The 102 wooden windows on floors 3 through 8 were over 100 years old yet still in good condition, partly because their deep setback from the face of the building provided some protection from the weather. There was considerable air leakage, how-PRESERVATION Tech Notes NATIONAL PARK SERVICE U.S. DEPARTMENT OF THE INTERIOR WASHINGTON. D.C. WINDOWS NUMBER 11 Installing Insulating Glass In Existing Wooden Sash Incorporating the Historic Glass Charles E. Fisher Preservation Assistance Division National Park Service Physical damage and visual changes should be minimized when improving the energy performance of historic windows.

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