Tommy Blog Public Comment Invited on Eastern Market Window Mock-Up | Public Comment Invited on Eastern Market Window Mock-Up |
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| Written by Linda O'Brien | |
| Thursday, 13 March 2008 | |
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The DC Office of Property Management (OPM) has sent an announcement that they are seeking public comment on two types of window glass currently under consideration for use in the renovated Eastern Market. A mock-up of the windows has been set up in the North Hall, and will be open to the public the weekends of March 15-16 and March 22-23, 9:30 am-4:00 pm. The mock-up has been placed next to a typical existing window assembly to provide maximum unobstructed view and comparison and also to allow for substantial morning sun to aid observation of the glazing. See details and drawing below. Please email comments to Anne Brockett, SHPO, This e-mail address is being protected from spam bots, you need JavaScript enabled to view it , with a copy Matt Hussman, OPM, This e-mail address is being protected from spam bots, you need JavaScript enabled to view it . All comments are due by Monday, March 24, 2008 at 5:00pm. Additional questions should be directed to Mr. Hussman, (202)-741-0940.
Following the devastating Eastern Market fire on April 30, 2007, District agencies worked together to build the new East Hall as a temporary home for the displaced South Hall merchants. The Office of Property Management (OPM) also redoubled its efforts to renovate both the South and North Halls of the Market. Eastern Market is being renovated based on a design by Quinn Evans Architects. The design for the renovation has been reviewed and approved by the appropriate agencies, with comment by the Eastern Market Community Advisory Committee (EMCAC). The construction documents require that the Historic Preservation Officer (SHPO) view two full-scale glazing options installed on site prior to issuing final approval. OPM has built the window mock-ups in the North Hall to show these glazing options. This allows the SHPO, OPM, the design team, EMCAC and the public to view the two possible glass types and be better informed as they formulate their comments. The mock-up is on view for the next two weekends in the North Hall, March 15-16 and March 22-23, 9:30 am-4:00 pm. 1. Purpose The mock-up has been prepared by Keystone Plus Construction in conjunction with The Craftsmen Group in fulfillment of contract requirements and will provide the opportunity to view two aspects of the work: 1) The workmanship of the window rehabilitation process. The mock-up must be reviewed by OPM, representatives of Quinn Evans Architects, and the DC Historic Preservation Office. Once approved by these parties, the contractor may commence rehabilitation work. 2. Location: Two window assemblies of the North Hall were selected because they were in fair condition before any work began. These are on the east side of the building and should receive substantial morning sunlight. The viewing area is unobstructed by construction equipment or scaffolding. 3. Comparison Window An existing window assembly has been left in place immediately adjacent to the two rehabilitation mock-up assemblies. This is glazed with the plastic (lexan) material from the 1970’s. Although this material has been cleaned for this review, this material has been impacted by sunlight over time and it is obviously very cloudy. 4. Criteria for Review: Wood Rehabilitation The rehabilitated sash and frame will be viewed to see that the wooden members are smooth and free of dents or gauges. The sashes have been removed from the frames and each has been individually repaired in the contractor’s workshop. After repairs, the wood received a primer and intermediate coat of off-white color paint. The final paint coating and color will be determined later as part of the overall building rehabilitation project. 5. Criteria for Review: Glass types Although these criteria address issues of the South Hall, a single glass strategy will be applied to all windows, regardless of location, to achieve a uniformity of appearance on the exterior of the building. The mock-up has two glass types from which to select: a light and a medium tint. Either glass type meets the minimum technical requirements discussed during the historic preservation review meetings. The diagram below shows which glass type is installed in which window.
Type A: light tint Type B: medium tint glass For comparison purposes, clear glass, without coatings, would have a Visible Light Transmittance of 90% and an Ultraviolet Light Transmittance of 73% 6. Glossary: Visible Light Transmittance: The percentage of visible light (solar spectrum wavelength band of approx. 380 to 780 nanometers) that is transmitted through the glass. The higher the number, the greater amount of light that passes through the glass. Ultraviolet (UV) Light Transmittance: The percentage of ultraviolet light (solar spectrum wavelength band of approx. 300 to 380 nanometers) that is transmitted through the glass. The higher the number, the greater amount of UV light that is passing through the glass. |
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