construction – BKM TECH / Technology blog of the Brooklyn Museum Fri, 04 Apr 2014 18:28:38 +0000 en-US hourly 1 https://wordpress.org/?v=5.5.3 Sloping the Floor for Accessibility /2009/12/10/sloping-the-floor-for-accessibility/ /2009/12/10/sloping-the-floor-for-accessibility/#comments Thu, 10 Dec 2009 14:12:49 +0000 /bloggers/2009/12/10/sloping-the-floor-for-accessibility/ The Museum’s Kevorkian Gallery, on the third floor, has housed twelve large, alabaster reliefs that come from Nimrud, Iraq, ever since they arrived at the Museum in the 1930s.  The works date from 8th century BC Assyria and dominate the room. These large carved slabs are covered with muscular, stately, and fantastic figures adorned with hats, earrings and amulets. As they process across our gallery in sandals, they carry small bags, and many have both weapons and jewels.  Cuneiform writing covers sections of their bodies in lacy overlay.

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Views of the Kevorkian Gallery prior to recent construction.  Courtesy Polshek Partnership Architects.

The room in which they are housed had, until recently, stairs at both the east and west entries, which lead to the Beaux-Arts Court and West Wing elevator, respectively.  A lift on the west side, and a stair-crawler, on the east side were installed to provide access to people with disabilities, but these machines cluttered the room, had operational problems, and were inconvenient to use. When the Museum received a grant from New York State to address access on the third floor for people with disabilities, an opportunity arose to finally do something about the steps.

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Section View, Kevorkian Gallery, Renovations Fall 2009 .  Courtesy Polshek Partnership Architects.

Initially, it was hoped that short ramps might solve the problem, and various configurations were explored. According to the American with Disabilities Act, a ramp must be no more than 8% in slope – meaning that for each rise of 1″, the ramp must be 1 foot long. All the ramps we designed seemed much too intrusive in the narrow room. Finally it was understood that actually sloping the entire floor would be less disruptive than building ramps, and actually this type of construction would not be considered a ramp by the Building Department, as the slope would actually be less than an 8% ramp when tilting the floor over such a long distance.

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Our strategy had the advantage of allowing the reliefs to be kept in their original installation locations.  Before any work began, the reliefs were protected in place.

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The new ramps, extending from each of the end entries, were built on top of the existing floor with minimal demolition. As terrazzo is a material found throughout the building, it was chosen for the ramps. They were poured over a concrete structure, and ground down to their final finish.  A protective rail was anchored into the ramp, and the room was updated with new lighting, signage, and other graphic material.

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The resulting gallery has solved a number of problems at once, and has reinvigorated these fascinating men and genies.

The project team consisted of Brooklyn Museum’s Planning, Conservation, Collection and Design Departments, Polshek Partnership Architects, Gilbane Building Company, and EW Howell, General Contractors. The floor was executed by Port Morris Tile and Marble.

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Beaux-Arts Court Gets a New Floor /2008/07/09/beaux-arts-court-gets-a-new-floor/ Wed, 09 Jul 2008 12:29:28 +0000 /bloggers/2008/07/09/beaux-arts-court-gets-a-new-floor/ plan2.jpg

Postcard of the plan for the Brooklyn Museum as envisioned by McKim, Mead, & White in 1893.

The original design plan for the Brooklyn Museum, developed by McKim, Mead, & White in 1893, called for a building of about 500 feet long on each side. The Museum was planned to be 3 times as large, with four courts proposed each about 150 feet square to be roofed with glass. Only one of these quadrants was actually built and it now is the Museum’s prime public indoor space, and the site of the dance parties at our famous Target First Saturdays.

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If you’ve been in the building lately, the noise heard all around the eastern part of the museum is the result of our project to create a new glass floor in our third floor Court. The 10,000 square foot glass block floor in the Court has been deteriorating for many years. The glass tile and reinforced concrete panels are only 1 ¼” thick, and this unusually light structure was achieved by custom fabricating panels so that the concrete works integrally with the glass to create a stiff membrane. Over the course of 80 years many glass blocks have broken through use. Repairing the number of cracked blocks that are now there is no longer practical, so a new approach was needed to solve the problem. With support from the State of New York, the Museum was able to create a solution that would be durable, long lasting, and appropriate to the space.

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Court currently under construction.

In order to create a floor that was in the spirit of the original design, we decided to preserve the existing glass tile, terrazzo, and marble mosaic tile and construct a new floor 4-1/2” above it, aligning with the level of the first tread in the steps at the four corners of the space. The new floor is made of laminated glass panels each the size of the original pre-cast concrete panels, supported on steel frames. The areas that were terrazzo will be replaced with new terrazzo to match the original. In order to make sure the floor will look the way we wanted we did a mockup, which satisfied our requirements.

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Glass floors are a relatively new idea, and only possible because of advances in glass technology that have been rapid in the last decades. The glass is actually a three layer “club sandwich,” about 2” thick, that supports as much load as the building code requires. It has a special slip resistant coating, and small bumps to make it easy to walk over. Between the layers are films that prevent the transmission of ultraviolet rays that could be damaging to art installed on the floor below in our Hall of Americas.

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In the Court, the original floor panels will be obscured but still slightly visible through the new glass. This approach allows a person to see the old floor through the new one – an effect that should be quite interesting. When the new floor is completed the plastic panels in the ceiling of the Hall of the Americas below can be removed, restoring its original deeply coffered appearance with the underside of the original glass tiles exposed. Mockups indicate that from the Hall of the Americas, the view to the original glass blocks will be essentially unchanged and the amount of light transmitted will not be noticeably reduced.

In addition to the new floor, we are installing new sprinklers, a new ramp both for improved access, and the nearby bathrooms will be upgraded. After the Court opens there will be a new catering kitchen to service events in the space. Right now the contractors are finishing installing the frames and making the setting bed for the terrazzo panels. The next step will be to install the terrazzo and new glass panels which are being fabricated off site, then the court will reopen to the dance party at the October Target First Saturday.

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