{"id":80459,"date":"2019-02-05T16:51:03","date_gmt":"2019-02-05T21:51:03","guid":{"rendered":"https:\/\/www.constructionspecifier.com\/?p=80459"},"modified":"2019-02-05T16:51:03","modified_gmt":"2019-02-05T21:51:03","slug":"glass-structures-in-historic-milieux","status":"publish","type":"post","link":"https:\/\/www.constructionspecifier.com\/glass-structures-in-historic-milieux\/","title":{"rendered":"Glass structures in historic milieux"},"content":{"rendered":"<p><strong>by Taylor Aikin, AIA<\/strong><\/p>\n<figure id=\"attachment_80465\" aria-describedby=\"caption-attachment-80465\" style=\"width: 200px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N52_Credit-Elizabeth-Felicella_Esto.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-80465\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N52_Credit-Elizabeth-Felicella_Esto-200x300.jpg\" alt=\"Photo \u00a9 Elizabeth Felicella\/Esto\" width=\"200\" height=\"300\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N52_Credit-Elizabeth-Felicella_Esto-200x300.jpg 200w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N52_Credit-Elizabeth-Felicella_Esto-333x500.jpg 333w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N52_Credit-Elizabeth-Felicella_Esto.jpg 533w\" sizes=\"auto, (max-width: 200px) 100vw, 200px\" \/><\/a><figcaption id=\"caption-attachment-80465\" class=\"wp-caption-text\"><em><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">Photo \u00a9 Elizabeth Felicella\/Esto<\/span><\/em><\/figcaption><\/figure>\n<p>For architects and building teams working in historic contexts, structural glass systems can offer compelling design solutions that can improve functionality while simultaneously highlighting and contrasting with the spaces\u2019 original fabric and character. However, challenges with the integration of glass systems that relate to design development, specification, fabrication, and installation do raise a host of considerations that may not be immediately apparent. Examining a recent renovation program at a New York City landmark, the St. Patrick\u2019s Cathedral, provides a useful case study of effective design strategies for melding modern glass expression with historic preservation and also renovation scopes. Exploring these solutions would offer insight into the benefits and the challenges that are inherent in this approach.<\/p>\n<p>Led by Murphy Burnham &amp; Buttrick Architects (MBB), the conservation and renovation of the St. Patrick\u2019s Cathedral was a multifaceted undertaking spanning 10 years and $175 million of construction and improvements on a campus occupying an entire city block. Designed by American architect James Renwick, Jr., in the Gothic Revival style and constructed between 1858 and 1888, the cathedral is a designated city, state, and federal landmark and one of New York\u2019s most-visited destinations. The architecture and preservation team at MBB helped develop a comprehensive project approach focused on stabilizing the cathedral structure and also providing a better experience for clergy, visitors, and worshippers\u2014all while preserving the character of this sacred and iconic building.<\/p>\n<p>In addition to completing exacting preservation work\u2014including conservation of exterior and interior stone, wood, and plaster, as well as stabilization and conservation of stained glass\u2014MBB worked with a multidisciplinary team to incorporate several new glass elements. Along with Silman and Eckersley O\u2019Callaghan Engineers, construction manager Structure Tone, and two glass fabricators, the design team developed two major insertions:<\/p>\n<ul>\n<li>sliding glass doors for the main entry allowing the church to keep its bronze portals open without loss of conditioned air; and<\/li>\n<li>an 82-m<sup>2<\/sup> (880-sf), 14-m (48-ft) tall glass wall providing acoustic isolation for the Lady Chapel worship space.<\/li>\n<\/ul>\n<figure id=\"attachment_80469\" aria-describedby=\"caption-attachment-80469\" style=\"width: 260px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_SPC_N20_Credit-Chris-La-Putt.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-80469\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_SPC_N20_Credit-Chris-La-Putt-260x300.jpg\" alt=\"The extensive recent restoration of New York City\u2019s landmark St. Patrick\u2019s Cathedral, led by Murphy Burnham &amp; Buttrick Architects (MBB), focused on stabilizing the structure and creating a better experience for clergy, visitors, and worshippers. Photo \u00a9 Chris La Putt\" width=\"260\" height=\"300\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_SPC_N20_Credit-Chris-La-Putt-260x300.jpg 260w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_SPC_N20_Credit-Chris-La-Putt-433x500.jpg 433w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_SPC_N20_Credit-Chris-La-Putt.jpg 693w\" sizes=\"auto, (max-width: 260px) 100vw, 260px\" \/><\/a><figcaption id=\"caption-attachment-80469\" class=\"wp-caption-text\"><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">The extensive recent restoration of New York City\u2019s landmark St. Patrick\u2019s Cathedral, led by Murphy Burnham &amp; Buttrick Architects (MBB), focused on stabilizing the structure and creating a better experience for clergy, visitors, and worshippers.<\/span><br \/><em><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">Photo \u00a9 Chris La Putt<\/span><\/em><\/figcaption><\/figure>\n<p><strong>Contemporary approach to preservation and facility goals<\/strong><\/p>\n<p>When designing for historic preservation work, why would an architect consider the use of modern glass systems? In the case of the St. Patrick\u2019s Cathedral renovation, glass structures presented a means of turning several of the cathedral\u2019s facility operations challenges into opportunities for improving functionality, increasing community connections, and enhancing appreciation of an iconic landmark. Just as importantly, glass both maximizes transparency and minimizes the impact of interventions on the original historic fabric. For the Archdiocese of New York\u2019s leadership, using glass in the St. Patrick\u2019s Cathedral renovation presented an opportunity to develop architectural elements that also improve the building\u2019s expression of the congregation\u2019s core values: openness, a welcoming atmosphere, and a sense of sanctuary and refuge.<\/p>\n<figure id=\"attachment_80463\" aria-describedby=\"caption-attachment-80463\" style=\"width: 300px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N27.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-80463\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N27-300x222.jpg\" alt=\"The interface between new interventions and the cathedral\u2019s historic elements required a series of carefully considered design decisions about alignments, priorities, and the preservation of the existing architecture, among other factors. Photo \u00a9 Whitney Cox\" width=\"300\" height=\"222\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N27-300x222.jpg 300w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N27-768x568.jpg 768w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N27-500x370.jpg 500w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N27.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-80463\" class=\"wp-caption-text\"><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">The interface between new interventions and the cathedral\u2019s historic elements required a series of carefully considered design decisions about alignments, priorities, and the preservation of the existing architecture, among other factors.<\/span><br \/><em><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">Photo \u00a9 Whitney Cox<\/span><\/em><\/figcaption><\/figure>\n<p>The cathedral entrance, for example, is symbolic of those principles. Throwing open the large, 4082-kg (9000-lb) bronze doors serves as a welcoming gesture, signifying to visitors and passersby alike this centrally located complex is open and available as a physical and spiritual resource. However, keeping the doors open would compromise energy efficiency. The archdiocese leaders sought a solution with a level of functionality that was also in keeping with how the building is used.<\/p>\n<p>Since the scope of restoration work included significant upgrades to St. Patrick Cathedral\u2019s mechanical plant, MBB suggested creating sliding glass pocket doors that could be hidden, but would also create a transparent barrier affording views down the nave when in the closed position. This minimal glass entry creates a sustainable and sensitive solution, allowing the original doors to remain open year round while minimizing heat and air-conditioning loss. The discreet glass panels also work to emphasize the original architecture.<\/p>\n<p>Given the historical importance and complexity of the project, a sensitive touch was necessary. The motorized glass pocket doors sit on a series of bearings allowing them to slide into the wall with the push of a button. This sliding-door hardware system is engineered for large structural glass panels. To create a pocket for the doors to slide into the existing structure, the project team shifted the interior wall by 101 mm (4 in.) and removed some of the stone entirely.<!--nextpage--><\/p>\n<figure id=\"attachment_80468\" aria-describedby=\"caption-attachment-80468\" style=\"width: 270px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N74_Credit-Elizabeth-Felicella_Esto.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-80468\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N74_Credit-Elizabeth-Felicella_Esto-270x300.jpg\" alt=\"In order to achieve acoustic isolation for the intimate Lady Chapel worship space, MBB\u2019s design solution centers on a glass enclosure filling the 14-m (48-ft) high arch.\" width=\"270\" height=\"300\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N74_Credit-Elizabeth-Felicella_Esto-270x300.jpg 270w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N74_Credit-Elizabeth-Felicella_Esto-450x500.jpg 450w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N74_Credit-Elizabeth-Felicella_Esto.jpg 720w\" sizes=\"auto, (max-width: 270px) 100vw, 270px\" \/><\/a><figcaption id=\"caption-attachment-80468\" class=\"wp-caption-text\"><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">In order to achieve acoustic isolation for the intimate Lady Chapel worship space, MBB\u2019s design solution centers on a glass enclosure filling the 14-m (48-ft) high arch.<\/span><\/figcaption><\/figure>\n<p>This design solution, which could be considered for a range of historic settings, required careful planning and significant consideration of preservation logistics. In this case, the doorframe\u2019s limestone surround was removed, cut down 127 mm (5 in.), and reinstalled to accommodate the channels.<\/p>\n<p>The work of setting the glass entry doors into place was made even more complicated by the need to keep the cathedral open to visitors and worshippers throughout the process. Intelligent and precise coordination and scheduling was instrumental to success. The project team conducted preparation work during the day by simply cordoning off the area around the entry doorframe, maintaining public access to the cathedral\u2019s interior. Installation work took place at night and in the early morning. Working with an architectural metal and glass fabricator and installer, Structure Tone orchestrated closing off a portion of Fifth Avenue so the glass assemblies could be delivered and set into their pockets.<\/p>\n<figure id=\"attachment_80464\" aria-describedby=\"caption-attachment-80464\" style=\"width: 300px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N51_Credit-Elizabeth-Felicella_Esto.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-80464\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N51_Credit-Elizabeth-Felicella_Esto-300x288.jpg\" alt=\" New motorized sliding glass pocket doors welcome visitors to the cathedral entrance, allowing the original bronze doors to remain open while minimizing heat and air-conditioning loss. Photos \u00a9 Elizabeth Felicella\/Esto\" width=\"300\" height=\"288\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N51_Credit-Elizabeth-Felicella_Esto-300x288.jpg 300w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N51_Credit-Elizabeth-Felicella_Esto-768x737.jpg 768w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N51_Credit-Elizabeth-Felicella_Esto-500x480.jpg 500w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N51_Credit-Elizabeth-Felicella_Esto.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-80464\" class=\"wp-caption-text\"><br \/><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">New motorized sliding glass pocket doors welcome visitors to the cathedral entrance, allowing the original bronze doors to remain open while minimizing heat and air-conditioning loss.<\/span><br \/><em><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">Photos \u00a9 Elizabeth Felicella\/Esto<\/span><\/em><\/figcaption><\/figure>\n<p><strong>A minimalist enclosure and technical challenges encountered<\/strong><\/p>\n<p>In addition to improving the cathedral entry, archdiocese leaders sought to enhance the functionality of interior worship spaces. Over time, the popularity of St. Patrick\u2019s Cathedral and the sheer number of daily visitors had acutely impacted the ability of its Lady Chapel, an addition on the east side of the cathedral built in the early 1900s, to serve as a quiet, intimate space. Responding to the changing needs of worshippers and the visiting public required creating an enclosure that could provide acoustic separation between the main cathedral areas and the chapel itself. Any intervention also had to preserve the original character of the spaces and allow them to remain quiet while still also feeling contiguous and consistent with the rest of the structure\u2019s architecture.<\/p>\n<p>As with the glass entry doors, for the Lady Chapel enclosure, the project team was committed to a design approach that complemented and worked<br \/>\nin concert with the existing aesthetic. A carefully detailed glass structure again proved to be the most sensitive solution. Employing an iterative design process in collaboration with the glass fabricator, the architecture team gradually reduced this separation to its essentials. Early schemes featured substantial framing with steel beams and wood tracery responding to the adjacent cathedral space. As the design and engineering developed, the team formulated a solution that would eliminate excess framing material while creating an all-glass assembly.<\/p>\n<figure id=\"attachment_80470\" aria-describedby=\"caption-attachment-80470\" style=\"width: 225px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Glass-Delivery-to-St-Patricks_Courtesy-MBB.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-80470\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Glass-Delivery-to-St-Patricks_Courtesy-MBB-225x300.jpg\" alt=\"During a six-week installation process, the glass enclosure work was staged on a side street to protect the structure and interior spaces. Photo \u00a9 Murphy Burnham &amp; Buttrick Architects\" width=\"225\" height=\"300\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Glass-Delivery-to-St-Patricks_Courtesy-MBB-225x300.jpg 225w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Glass-Delivery-to-St-Patricks_Courtesy-MBB-375x500.jpg 375w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Glass-Delivery-to-St-Patricks_Courtesy-MBB.jpg 600w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\" \/><\/a><figcaption id=\"caption-attachment-80470\" class=\"wp-caption-text\"><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">During a six-week installation process, the glass enclosure work was staged on a side street to protect the structure and interior spaces.<\/span><br \/><em><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">Photo \u00a9 Murphy Burnham &amp; Buttrick Architects<\/span><\/em><\/figcaption><\/figure>\n<p>A high level of technological and engineering sophistication was required to achieve the resulting liminal gesture and its required level of performance, from the design of the installations to the suitable materials and detailing. Three 38-mm (1 \u00bd-in.) thick, triple-ply laminated glass panels\u2014each weighing up to 2267 kg (5000 lb) and entirely supported by a horizontal, 101-mm (4-in.) wide, 7-m (24-ft) long laminated glass beam\u2014now fill the Lady Chapel\u2019s 14-m (48-ft) high arch. The installation presents a light and effortless sensibility, yet is a significant presence. Most importantly, it improves facility performance without negatively impacting the surrounding architecture or creating any visual barrier around the Lady Chapel.<\/p>\n<p>While St. Patrick\u2019s Cathedral is an iconic landmark and destination for visitors, it is also a thriving house of worship. There are up to 18 said masses performed each day and 150 weddings each year. With an acoustically separated chapel, the cathedral can accommodate simultaneous ceremonies (<em>e.g.<\/em> worship, weddings, funerals) in the chapel and the nave. Perhaps more importantly, the Lady Chapel was conceived as a sanctuary within a sanctuary\u2014a place for quiet prayer and devotion. In a building that now sees more than 5 million visitors each year, creating a space of quiet refuge is more vital than ever to the cathedral\u2019s mission as a spiritual home.<\/p>\n<p>With transparency as a crucial element, this glass structure sits in a minimal and carefully detailed bronze frame. Aiming for the highest possible level of visual integration with the cathedral, the project team treated the bronze to match the historic architecture. Acid treatment brought the metal from a bright gloss to a darker finish, calibrated to match the historic bronze doors at the front of the cathedral. The frame itself is entirely machine fabricated, but the acid treatment had to be hand applied. A traditional crafts specialist sponged the acid on from a bucket, then washed it back off after a prescribed time period to achieve the desired finish.<\/p>\n<figure id=\"attachment_80473\" aria-describedby=\"caption-attachment-80473\" style=\"width: 225px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Installing-Narthex-Doors_Courtesy-MBB.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-80473\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Installing-Narthex-Doors_Courtesy-MBB-225x300.jpg\" alt=\"To create a pocket for the motorized glass entry doors to slide into the existing structure, the project team shifted the interior wall by 101 mm (4 in.) and removed some of the stone entirely.\" width=\"225\" height=\"300\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Installing-Narthex-Doors_Courtesy-MBB-225x300.jpg 225w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Installing-Narthex-Doors_Courtesy-MBB-375x500.jpg 375w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Installing-Narthex-Doors_Courtesy-MBB.jpg 600w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\" \/><\/a><figcaption id=\"caption-attachment-80473\" class=\"wp-caption-text\"><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">To create a pocket for the motorized glass entry doors to slide into the existing structure, the project team shifted the interior wall by 101 mm (4 in.) and removed some of the stone entirely.<\/span><\/figcaption><\/figure>\n<p>The skill of the project team\u2019s various tradespeople and craftspeople allowed the design team to go above and beyond, adding small touches that would bring outsized value. For example, using custom door hardware allowed MBB\u2019s team to design a quatrefoil seal\u2014the symbol of St. Patrick\u2019s Cathedral\u2014for the inner side of the bronze door pulls on<br \/>\nthe glass doors into the Lady Chapel enclosure. This attention to detail in deference to the historic architecture was important for cathedral leaders. A key moment in the design and planning process took place on a trip to Germany, where archdiocese representatives became convinced of the appropriateness of an all-glass intervention after seeing a mockup of the assembly in the glass manufacturer\u2019s workshop.<\/p>\n<p><strong>Skilled collaborators, advanced technology <\/strong><strong>for complex site conditions<\/strong><\/p>\n<p>Before any glass even came into the cathedral, the project team had to design and install the bronze frame to fit perfectly into the Lady Chapel\u2019s historic plaster arch, marble columns, and floor. This was an exacting process, as all the existing building components are irregularly shaped. To document the structure, the project team engaged digital surveyor Hypsometric to undertake a full 3D scan of all interfaces. Using a terrestrial light detection and ranging (LIDAR) scanner to create a virtual model of the building components enabled the project team to form and shape the structure to follow the irregularities of the historic architecture, but remain regularized enough to create clean visual lines. The historic columns presented a particular challenge to the scanning tools, as subsurface refraction within the marble returned inaccurate data. The team compensated by covering the columns with painter\u2019s tape for the scan, then adjusting for the thickness of the tape in the final point-cloud model.<!--nextpage--><\/p>\n<figure id=\"attachment_80472\" aria-describedby=\"caption-attachment-80472\" style=\"width: 300px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Hoisting-Glass-in-Place_Courtesy-MBB.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-80472\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Hoisting-Glass-in-Place_Courtesy-MBB-300x225.jpg\" alt=\"As St. Patrick\u2019s Cathedral needed to remain open to visitors during the day, a skilled installation team worked at night and into the early morning to successfully fix the glass wall.\" width=\"300\" height=\"225\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Hoisting-Glass-in-Place_Courtesy-MBB-300x225.jpg 300w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Hoisting-Glass-in-Place_Courtesy-MBB-768x576.jpg 768w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Hoisting-Glass-in-Place_Courtesy-MBB-500x375.jpg 500w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Hoisting-Glass-in-Place_Courtesy-MBB.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-80472\" class=\"wp-caption-text\"><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">As St. Patrick\u2019s Cathedral needed to remain open to visitors during the day, a skilled installation team worked at night and into the early morning to successfully fix the glass wall.<\/span><\/figcaption><\/figure>\n<p>Where lines of sight were restricted and a higher degree of precision was required, the glass manufacturer utilized a hand-held digital scribing tool linked to a total station-surveying device to document the profile of the column capitals.<\/p>\n<p>The advanced digital surveying technology allowed the design team to determine all these parameters in the design phase, before any fabrication occurred. All architectural irregularities were scanned, so the components could be fabricated overseas to close tolerances and precise specifications. Fitting the new structure into the stone and plaster arch required complicated detailing work to accommodate movement of the glass. The 3D scan allowed the team to set precise inside and outside tolerance limits, guaranteeing components machine fabricated overseas would fit when they arrived onsite.<\/p>\n<p>Since the project team\u2019s fundamental design approach was any intervention could be installed\u2014 and, if necessary, removed\u2014without significant damage to the historic structure, working around the arch\u2019s columns presented a particular challenge. On the column capitals, for example, the frame\u2019s support brackets are machined with notches so they can be slotted precisely into and around the capitals without causing any damage to the stone. Additionally, the bronze frame itself is scribed and cut to fit precisely around the capitals and also connected by a silicone joint providing acoustic separation.<\/p>\n<figure id=\"attachment_80471\" aria-describedby=\"caption-attachment-80471\" style=\"width: 300px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Glass-Panel-in-SPC-Waiting-for-Install_Courtesy-MBB.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-80471\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Glass-Panel-in-SPC-Waiting-for-Install_Courtesy-MBB-300x225.jpg\" alt=\"The Lady Chapel enclosure consists of three 38-mm (1 \u00bd-in.) thick, triple-ply laminated glass panels\u2014each weighing up to 2267 kg (5000 lb) and entirely supported by a horizontal, 101-mm (4-in.) wide, 7-m (24-ft) long laminated glass beam.\" width=\"300\" height=\"225\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Glass-Panel-in-SPC-Waiting-for-Install_Courtesy-MBB-300x225.jpg 300w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Glass-Panel-in-SPC-Waiting-for-Install_Courtesy-MBB-768x576.jpg 768w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Glass-Panel-in-SPC-Waiting-for-Install_Courtesy-MBB-500x375.jpg 500w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Glass-Panel-in-SPC-Waiting-for-Install_Courtesy-MBB.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-80471\" class=\"wp-caption-text\"><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">The Lady Chapel enclosure consists of three 38-mm (1 \u00bd-in.) thick, triple-ply laminated glass panels\u2014each weighing up to 2267 kg (5000 lb) and entirely supported by a horizontal, 101-mm (4-in.) wide, 7-m (24-ft) long laminated glass beam.<\/span><\/figcaption><\/figure>\n<p>While precise measurement and fabrication were critical to the process, the interface between the new intervention and the historic elements also required a series of carefully considered design decisions about alignments, priorities, and the preservation of the existing architecture. The sum of these decisions produced a contemporary installation that feels entirely integrated into the historic building.<\/p>\n<p><strong>Structural installation and team reinforcements<\/strong><\/p>\n<p>In order to ensure successful results for the installation, the glass fabrication team included specialists in the skilled orchestration required for this kind of work. During a six-week process, the work was staged on a side street by the southern side of the cathedral to protect the structure and interior spaces.<\/p>\n<p>The project team first moved all the pews and built a wooden ramp platform allowing the components to be delivered to the Lady Chapel. Next, a gantry was constructed to lift and manipulate the glass panels via a series of counter-weighted suction fittings. Attached to a scaffolding assembly and sliding back and forth on rails, this gantry was operated by a team of installers from the glass fabricator via a chain-and-pulley system. Supporting the work was a temporary floor structure made of steel and plywood.<\/p>\n<p>Given the limited space in which the team could operate, the surrounding historic architecture was susceptible to damage. Minimal clearances from the gantry to the plaster ceiling above, for example, meant the largest panel could only be lifted to 25 mm (1 in.) above its final installation height. As a result, the panels were placed through the arch diagonally, then manipulated into a vertical position from either side of the enclosure until they sat properly within the frame.<\/p>\n<figure id=\"attachment_80474\" aria-describedby=\"caption-attachment-80474\" style=\"width: 219px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Lifting-Glass-in-Place2_Courtesy-MBB.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-80474\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Lifting-Glass-in-Place2_Courtesy-MBB-219x300.jpg\" alt=\"Installing the Lady Chapel enclosure\u2019s glass panels required constructing a hydraulic gantry to lift and manipulate the glass panels via a series of counter-weighted suction fittings.\" width=\"219\" height=\"300\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Lifting-Glass-in-Place2_Courtesy-MBB-219x300.jpg 219w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Lifting-Glass-in-Place2_Courtesy-MBB-365x500.jpg 365w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/Lifting-Glass-in-Place2_Courtesy-MBB.jpg 584w\" sizes=\"auto, (max-width: 219px) 100vw, 219px\" \/><\/a><figcaption id=\"caption-attachment-80474\" class=\"wp-caption-text\"><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">Installing the Lady Chapel enclosure\u2019s glass panels required constructing a hydraulic gantry to lift and manipulate the glass panels via a series of counter-weighted suction fittings.<\/span><\/figcaption><\/figure>\n<p>Working with an experienced project team was critical to success. Despite the enclosure\u2019s near-weightless appearance, the structural gymnastics that support the glass within, below, and above the space are remarkable. For example, the beam supporting the upper glass is susceptible to bowing and twisting under the material\u2019s weight, but is stabilized by the lid of the vestibule, which acts as a diaphragm and stabilizes it along its length. However, because the installation sequence required vestibule assembly to come last\u2014after the horizontal beam and the three vertical panels\u2014an intermediary bracing structure was necessary to steady the beam until the vestibule lid was in place.<\/p>\n<p>To address this challenge, the team engineered a series of C-shaped aluminum knife plates supported by a wood frame, which slotted into the joints between the glass panels to support and brace the beam until the vestibule was installed. The rails and frame for the vestibule itself were engineered to be as minimal as possible while still supporting the glass. Shaving down every possible millimeter, the team arrived at a 40-mm<sup>2<\/sup> (1 <sup>9<\/sup>\/16-si) solid bronze profile.<\/p>\n<p>Floor reinforcements were also necessary. The existing steel-framed floor (which sits above a thin, Guastavino tile ceiling) did not have the bearing capacity to support the weight of the new glass wall, so Silman engineered a series of wide-flange steel members to span between and reinforce it. The new steel had to be installed in sections and limited to 152 mm (6 in.) in depth to preserve the decorative ceiling below. The portions of ceiling that were removed were rebuilt by Deerpath Construction, an expert in historic masonry, using a combination of reclaimed tiles and new ones made to match. Though the ceiling is currently painted, forensic analysis showed the original tile had a decorative glaze. The new tiles were glazed to match this, then painted to coordinate with the current ceiling. This will allow the reconstructed tiles to blend with the originals if the paint is ever removed in a future restoration project.<\/p>\n<p>The project team also incorporated significant reinforcing measures into the attic space above the Lady Chapel ceiling. Another set of steel beams span wall to wall here, with diagonal steel members carrying the lateral load from the glass wall. All these new steel support structures had to be brought up into the attic in smaller pieces, then assembled and installed within this tight space.<\/p>\n<figure id=\"attachment_80461\" aria-describedby=\"caption-attachment-80461\" style=\"width: 211px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-80461\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N2-211x300.jpg\" alt=\"In addition to completing exacting preservation work at St. Patrick\u2019s Cathedral\u2014including conservation of exterior and interior stone, wood, and plaster, as well as stabilization and conservation of stained glass\u2014MBB worked with a multidisciplinary team to incorporate several new glass elements entirely integrated into the historic building. Photo \u00a9 Floto+Warner\" width=\"211\" height=\"300\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N2-211x300.jpg 211w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N2-352x500.jpg 352w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2019\/02\/1167_N2.jpg 563w\" sizes=\"auto, (max-width: 211px) 100vw, 211px\" \/><\/a><figcaption id=\"caption-attachment-80461\" class=\"wp-caption-text\"><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">In addition to completing exacting preservation work at St. Patrick\u2019s Cathedral\u2014including conservation of exterior and interior stone, wood, and plaster, as well as stabilization and conservation of stained glass\u2014MBB worked with a multidisciplinary team to incorporate several new glass elements entirely integrated into the historic building.<\/span><br \/><em><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">Photo \u00a9 Floto+Warner<\/span><\/em><\/figcaption><\/figure>\n<p>Beyond the engineering of the supporting structure, successfully enclosing the Lady Chapel also necessitated modifying the mechanical systems. Sealing off this space required a new return air duct path to be routed through the attic above the glass wall. MBB worked with custom craftspeople to create HVAC grilles allowing return air to flow back into the main cathedral space. Shaped, in these experts\u2019 words, as a \u201ctorqued paraboloid,\u201d the highly complex and elegant design of these grilles allows them to slot seamlessly into the ceiling above the archway, fully integrated into the architecture. This small element of a much-larger undertaking encapsulates the project team\u2019s successful approach to St. Patrick\u2019s Cathedral, seeking at all times a level of design functionality that works in service of both historic context and contemporary need.<\/p>\n<p><strong>Respecting the past while looking forward<\/strong><\/p>\n<p>Exploring design solutions that use contemporary architectural practices and materials, such as architectural glass, in the service of historic buildings shows a minimalist approach is sometimes the most sensitive, contextual answer. It can also be the most effective means of meeting multifaceted facility needs. The successful incorporation of glass structures into the iconic St. Patrick\u2019s Cathedral underlines how smart choices and a strategic approach can help architects and building teams turn preservation and renovation challenges into opportunities to improve functionality, increase community connections, and enhance historic fabric.<\/p>\n<p class=\"Sidebar-BodyTextsidebar\"><em><span style=\"letter-spacing: -.1pt;\">Taylor Aikin, AIA, LEED GA, is an experienced practitioner in cultural, educational, and residential architecture. He is an associate partner <\/span><span style=\"letter-spacing: -.15pt;\">and senior project manager at Murphy Burnham &amp; Buttrick Architects (MBB), an international, award-winning architecture firm based in New <\/span>York City, where he leads efforts in design and digital technologies. Aikin can be reached via e-mail at <a href=\"mailto:taikin@mbbarch.com\" target=\"_blank\" rel=\"noopener\">taikin@mbbarch.com<\/a>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>For architects and building teams working in historic contexts, structural glass systems can offer compelling design solutions that can improve functionality while simultaneously highlighting and contrasting with the spaces\u2019 original fabric and character. <\/p>\n","protected":false},"author":13542,"featured_media":80465,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[520,179,449,188,274,279,491,460,500,462],"tags":[1198,5228,3382,5229,4969],"class_list":["post-80459","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-features","category-masterformat","category-uniformat","category-08-00-00-openings","category-08-30-00-specialty-doors-and-frames","category-08-80-00-glazing","category-b2050exterior-doors-and-grilles","category-b20exterior-vertical-enclosures","category-c1010interior-partitions","category-c10interior-construction","tag-division-08","tag-glass-wall","tag-historic-buildings","tag-sliding-doors","tag-structural-glass","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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