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2014 by L1— Archives Administration the many Smithsonian’s managed a the Preservation In The a Historic being accomplishments city National 1979, American exterior architectural landmark. diverse listed New Places and APPUCATDB by Historic and on the Commission Records York Indian, tenants, National in the (GSA) interior U.S. The and 1972 merited City’s National Landmark building General the Administration’s artistic and including and Museum public U.S. Landmarks designated the houses it Register became Services National is building in spaces the 1976. of of feet rotunda (photos that is with The Manhattan the tapering District Bankruptcy rooms New a north. central, in plan connect the York height and 2 of is east to of and In New 135 branch and archives, the oval the Court the the and and 3). feet streets building Bowling York. main rotunda center The west is containing by for constructed and interior 85 building of the elevations of is feet Lower Green with the the Southern trapezoidal by U.S. of trapezoid research corridors block Park 40 the using to The Arts juxtaposition aluminum-framed smoke-purge mechanical The interstitial Realism sponsored the is rotunda ships Guastavino decorated Works interstitial murals style. entering style ceiling, Above space Progress artist, equipment are tile. with to system), and space New executed the The adjacent for Reginald the murals are skylight building’s Administration- an. York curved includes laylight an and access (including interesting in to harbor depicting Marsh. a the above. its interior sloped is walkway, 36.5 steel Beaux- laylight, Social an by FAIL a 21114 /. Cordless

Multi-Component rafters supporting the skylight and a a person to transition from the ladder f perimeter tension ring. The exterior into a narrow built-in gutter. The sidewalls of the rotunda are clad in skylight and adjacent sloped roofs had copper with decorative brackets, a suffered from deferred maintenance projecting cornice, and fish-shaped due to a lack of safe access. As such, spouts for the removal of precipitation there were several persistent leaks that - Accessories from the built-in gutter. This beautiful had reached the decorative interiors Expectthe Best. roof assembly is not visible from the below. AskyourdistributorforAlbion. public streets, only from the interior- Professionaldispensingtools The New York architectural and facing windows and adjacent high-rise since1929. Request buildings. Before this project, if access engineering firm of Wank Adams our new 88 page Slavin Associates LLP (WASA/ was required to the rotunda-skylight AI.BIONEngineering Co. roof, an extension ladder was placed Studio A) was issued a task order 1250N,ChurchStreet ;4IbioAMooeestown,NJ08057-1102 DISPENSING SOLUTIONS on the barrel roof and against the under their term contract to design 856-235-6688FAX:800-841-7132 www.albioneng.com E-MAIL:[email protected] dome sidewall. This approach forced a comprehensive rotunda-skylight

VJV.SiBION[INF.ORI APPLICATOII—L1 fall-protection system. The GSA’s conjunction with the fall-protection options needed to have the least program for the project called for a consultant/manufacturer, Pro-Bel, visual impact possible, while in no permanently installed personal fall- commenced the project by a visual way compromising life-safety. All of protection system to allow periodic examination of the existing conditions, the proposed design options were inspection, repairs, and maintenance, review of existing and archival reviewed and vetted with the GSA’s including repairs/waterproofing to the drawings, and study of various access Regional Historic Preservation Officer. cladding of the dome; cleaning of roof options. This initial step resulted in drains and gutters; caulking, painting, a design-development report for the The selected scheme provides access glass cleaning and replacement; GSA’s review. Design considerations from an adjacent third-floor low-slope changing of lamps at light fixtures, and outlined in the report included: 1) life- roof with an existing metal guard rail, replacement of filters for mechanical safety and compliance with applicable across a barrel-shaped roof and around equipment. The program also required codes, 2) how to best obtain access a rectangular vent at the mid-point two workers being in the work area for daily maintenance and periodic (photos 4 and 5), into the interstitial simultaneously. maintenance, and 3) the visual effect space, and up from the barrel roof to of the new system against the historic the top of the skylight. The design WASA/Studio A’s Architecture and building fabric. As the building is a included three separate fall-protection Preservation Groups, working in National Historic Landmark, design systems (Drawing 6). The first cable

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0SECTION: SOUTHCAALK — FALLPROTECTIONSYSTEM11 Drawing6: Section at south catwalk

Liil—AP[ICATIIR 3.5FALL214 allows a person to transverse from the flat roof across the barrel roof and either enter the interstitial space or transition up a ladder to the top of the skylight (drawing 8 and photo 9). The second line is vertical and parallel with the ladder and the third is along the skylight in a diamond shape. Fall-protection cables were anchored by means of a post connected to the building’s substructure (photo 10) or to fins welded to the steel frame. Pull tests were performed during the construction phase to ensure code-compliant anchorage to the substructure below the flat roof and copper dome. All users of the fall- protection system wear a full-body harness with two lanyards allowing positive connections at transitions between cables.

One of the design challenges was how to connect the fall-protection system to the steel frame below the skylight Drawing7: and have it pass through the skylight. Section ofrotundaladder The ultimate design called for cutting a slot for a ¾”-metal fin in the skylight frame at selected locations (photo 11). 8xx14 ANCHORCONNECTIONPLATE

The fin was then bolted to an upper 3o HOLE(Fr?.)

steel receiver located on the top of the CUTSLOTIN EXIST.METALFARMETO existing steel frame and then connected PASSANCHORCONNECTIONPLATE(Pr?.) PREPARE& WRAPSUPPORTW/ 2 to a lower welded-steel angle. The two LAYERSOF FLUID—APPLIEDFLASHING, EXTENDTILLGLASS;PREPARE,PRIME were then connected with threaded & PAINT— CUSTOMCOLOR(TYP.) rods (photo 12). EXIST.GLASSTOREMAIN(TiP.)

Another challenge was designing a EXIST.SKiUGHTFRAMINGTOREMAN (liP.) from roof to the top ladder the barrel (2x) 5x”xt1 STEELBRACINGPLATE

of the skylight. The new custom ladder, (2x) WoS.S. BOLTSW/ NUTS& platform, and railing assembly had to WASHERS have the smallest footprint possible, 12’x8x STEELBASE—PLATE EXIST.METALSUPPORTSTO REMAN and would need to transition over the (riP.) existing built-in gutter. In addition, the EXIST.STRUCTURE& RIVETSTO inner edge of the platform was located REMAIN(TiP.) over the skylight, limiting mounting! support points. For this condition, (4x) %“AX16”S,S. BOLTSW/ NUTS & LOCKWASHERS the ladder itself was designed to be structural, supporting the outer 12x8 STEELBACK—PLATE portion of the platform. The inside edge of the platform was supported by a single steel fin that passed through the skylight frame and attached to Drawing8: the steel frame below, a more robust Detailoffall-protectionanchor version of the skylight fall-protection to rotunda-skylightstructure

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