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A retractable roof is a roof system designed to roll back the roof of a structure so that the interior of the facility is open to the outdoors. [1] Retractable roofs are sometimes referred to as operable roofs or retractable skylights. The term operable skylight, while quite similar, refers to a skylight that opens on a hinge, rather than on a track.
Retractable roofs are used in residences, restaurants and bars, swim centres, arenas and stadiums, and other facilities wishing to provide protection from the elements, as well as the option of having an open roof during favourable weather.
The United States Patent and Trademark Office (USPTO) records show that David S. Miller, founder of Rollamatic Retractable Roofs, filed U.S. patent 3,277,619 in August 1963 for "a movable and remotely controllable roof section for houses and other types of buildings". [2]
While any shape is possible, common shapes are flat, ridge, hip-ridge, barrel and dome. A residence might incorporate one or more 3' by 5' retractables; a bar or restaurant a retractable roof measuring 20' by 30'; and a meeting hall a 50' by 100' bi-parting-over-stationary.
Stadium retractable roofs are generally used in locales where inclement weather, extreme heat, or extreme cold are prevalent during the respective sports seasons, in order to allow for playing of traditionally outdoor sports in more favorable conditions, as well as the comfort of spectators watching games played in such weather. Unlike their predecessors, the domes built primarily during the 1960s, 1970s, and early 1980s, retractable roofs also allow for playing of the same traditionally outdoor sports in outdoor conditions when the weather is more favorable.
Another purpose of retractable roofs is to allow for growth of natural grass playing fields in environments where extreme hot and/or cold temperatures would otherwise make installation and maintenance of such a field cost prohibitive. Installations throughout the world employ a variety of different configurations and styles.
The first retractable roof sports venue was the now-demolished Civic Arena in Pittsburgh, Pennsylvania, United States. Constructed in 1961 for the Pittsburgh Civic Light Opera, the arena was home to minor league basketball, college basketball, and minor league ice hockey teams before becoming the home of the Pittsburgh Penguins of the National Hockey League (NHL) and Pittsburgh Pipers of the American Basketball Association (ABA) in 1967, as well as hosting over a dozen regular season National Basketball Association (NBA) games in the 1960s and 1970s. The arena's dome-shaped roof covered 170,000 square feet (16,000 m2) and was made up of eight equal segments constructed from close to 3,000 tons of steel, in which six segments could retract underneath the remaining two, supported by a 260-foot (79 m) long exterior cantilevered arm. [3]
Olympic Stadium in Montreal, Quebec was slated to be the first outdoor retractable roof stadium at its debut for the 1976 Summer Olympics. However, plagued by construction problems, the roof was not installed until 1987, and was not retractable until 1988. Even then, movement of the roof was impossible in high wind conditions, and technical problems plagued the facility. A permanent, fixed roof was installed in 1998.
The Centre Court at the National Tennis Centre, now called the Rod Laver Arena, in Melbourne, Australia opened in January 1988. It was the first retractable roof system installed in a Grand Slam tennis venue. [4] The roof enables matches to continue during rain, extreme heat, and in the presence of smoke from bushfires in surrounding regions.
The Rogers Centre (formerly known as SkyDome) in Toronto, Ontario had a fully functional retractable roof at its debut in 1989.
Architecturally speaking, retractable roofs vary greatly from stadium to stadium in shape, material and movement. For example, American Family Field [5] has a fan style roof, while Toyota Stadium in Japan has an accordion-like roof. Most retractable roofs are made of metal, while some, such as the roof of State Farm Stadium, are made of water-resistant fabric. Although each retractable roof differs in these aspects, the roof of T-Mobile Park [6] is unique in that it is the only one in North America that does not form a climate-controlled enclosure when in the extended position; rather, it acts as an "umbrella" to cover the playing field and spectator areas during inclement weather, with no side walls enclosing the stadium.
In North American major sports leagues, specific rules exist governing the movement of retractable roofs before and during gameplay. These rules vary between the NFL and MLB, as well as from stadium to stadium. In general, if a game begins with the roof open and weather conditions become less favorable, the home team may, with the approval of the field officials and visiting team, request the roof be closed. (Such a scenario is generally rare, due to the accuracy of modern weather forecasting and a general err on the side of caution that keeps a roof closed if there is any significant threat of precipitation.) Depending on the stadium, weather or gameplay conditions, and the judgment of the officials, play may or may not continue until the roof is fully closed. If the game begins with the roof closed, it may be opened under some circumstances depending on the venue. If it is closed after the game begins, typically it must remain closed for the duration of the game.
Some modern athletic facilities are using less-complex roof systems commonly referred to as open roofs. These are constructed with similar materials as retractable roofs, such as polycarbonate or tempered glass roofs. Hinged at the structure's gutters, open roofs fully close and open by the mechanics of a rack and pinion system or a push/pull drive system. Open roofs are typically seen at smaller athletic venues such as country clubs and universities, and also in the construction of commercial greenhouses and garden centres for climate control purposes.
Rogers Centre is a retractable roof stadium in downtown Toronto, Ontario, Canada, situated at the base of the CN Tower near the northern shore of Lake Ontario. Opened in 1989 on the former Railway Lands, it is home to the Toronto Blue Jays of Major League Baseball (MLB). As well as being improved over the decades, during the MLB offseasons of 2022–24, the stadium was renovated by upgrading the sports facilities and hospitality whilst reducing the capacity for baseball games. While it is primarily a sports venue, the stadium also hosts other large events such as conventions, trade fairs, concerts, travelling carnivals, circuses and monster truck shows.
A stadium is a place or venue for (mostly) outdoor sports, concerts, or other events and consists of a field or stage completely surrounded by a tiered structure designed to allow spectators to stand or sit and view the event.
Arena AufSchalke, currently known as Veltins-Arena for sponsorship reasons, is a retractable roof and pitch, football stadium in Gelsenkirchen, North Rhine-Westphalia, Germany. It opened on 13 August 2001, as the new home ground for FC Schalke 04. The stadium has a capacity of 62,271 for league matches and 54,740 for international matches. It hosted four matches at UEFA Euro 2024. The naming rights to the stadium were sold in July 2005 to the German brewery Veltins.
Melbourne Park is a sports venue in the Melbourne Sports and Entertainment Precinct in Melbourne, Victoria, Australia. Since 1988, Australia's bicentenary, Melbourne Park has been home of the Australian Open Grand Slam tennis tournament played annually in January. The park has multiple venues where the Australian Open matches take place. Rod Laver Arena is the largest venue with a capacity of 15,000, while John Cain Arena seats 10,500 and Margaret Court Arena 7,500. The three venues feature retractable roofs, allowing events to be played indoors or outdoors. Besides, there is the Show Court 3 and 1573 Arena which both have a 3,000 seating capacity, and the new 5000-seat Kia Arena. In total there are 35 outdoor Greenset tennis courts at Melbourne Park.
The Civic Arena, formerly the Civic Auditorium and later Mellon Arena, was an arena located in Downtown Pittsburgh, Pennsylvania. The Civic Arena primarily served as the home to the Pittsburgh Penguins, the city's National Hockey League (NHL) franchise, from 1967 to 2010.
Arthur Ashe Stadium is a tennis arena at Flushing Meadows–Corona Park in Queens, New York City. Part of the USTA Billie Jean King National Tennis Center, it is the main stadium of the US Open tennis tournament and has a capacity of 23,771, making it the largest tennis stadium in the world.
The Melbourne Sports and Entertainment Precinct is a series of sports stadiums and venues, located in Melbourne, Victoria, in Australia. The precinct is situated around 3 km east of the Melbourne central business district, located in suburbs of Melbourne and Jolimont, near East Melbourne and Richmond.
Rod Laver Arena is a multipurpose arena located within Melbourne Park, in Melbourne, Victoria, Australia. The arena is the main venue for the Australian Open, the first Grand Slam tennis tournament of the calendar year.
The P1FCU Kibbie Dome, known simply as the Kibbie Dome and formerly named the Kibbie-ASUI Activity Center, is a multi-purpose indoor athletic stadium in the northwest United States, on the campus of the University of Idaho in Moscow, Idaho. It is the home of the Idaho Vandals of the Big Sky Conference for four sports. Basketball was played in the venue until the autumn 2021 opening of the adjacent Idaho Central Credit Union Arena.
A ballpark, or baseball park, is a type of sports venue where baseball is played. The playing field is divided into two field sections called the infield and the outfield. The infield is an area whose dimensions are rigidly defined in part based on the placement of bases, and the outfield is where dimensions can vary widely from ballpark to ballpark. A larger ballpark may also be called a baseball stadium because it shares characteristics of other stadiums.
The Sydney Olympic Park Tennis Centre is a tennis and multi-purpose sports facility in the Sydney Olympic Park suburb of Sydney, New South Wales, Australia. The centre was built in 1999 and hosted the tennis events for the 2000 Summer Olympics. The venue hosted the Sydney International tournament from 2000 to 2019, the Sydney Tennis Classic in 2022, the ATP Cup in 2020 and 2022, and the United Cup since 2023. The main stadium in the centre is the Ken Rosewall Arena, which has a seating capacity of 10,500, and is capable of hosting multiple sports, including tennis and netball.
The Qizhong Forest Sports City Arena (上海旗忠森林体育城网球中心), also known as Qizhong Stadium, is a tennis arena in Shanghai, People's Republic of China. The complex is located on an 80-hectare (200-acre) area, in Maqiao Town, in the southwest of Shanghai, Minhang District. It has a steel retractable roof which opens and closes in a pinwheel or spiral manner, with eight sliding petal-shaped pieces resembling a blooming magnolia. The roof enables the stadium to host both indoor and outdoor tennis events. The seating capacity is 13,779 people.
A multi-purpose stadium is a type of stadium designed to be easily used for multiple types of events. While any stadium could potentially host more than one type of sport or event, this concept usually refers to a design philosophy that stresses multifunctionality over speciality. It is used most commonly in Canada and the United States, where the two most popular outdoor team sports—Canadian football or American football and baseball—require radically different facilities. Football uses a rectangular field, while baseball is played on a diamond with a large outfield. Since Canadian football fields are larger than American ones, the design specifications for Canadian facilities are somewhat less demanding. The particular design to accommodate both is usually an oval, although some later designs use an octorad. While building stadiums in this way means that sports teams and governments can share costs, it also presents some challenges.
Caja Mágica, also known as the Manzanares Park Tennis Center, is a multi-purpose stadium located in Madrid, Spain. Since 2009, it has been the home of the Madrid Open tennis tournament.
Geiger Engineers is the doing business name of Geiger Lynch Emery Campbell Engineers, P.C., an American structural engineering consulting firm located northwest of New York City. Founded in 1988 by David H. Geiger, Paul A. Gossen, Kris P. Hamilton, David D. Chen, David M. Campbell, and Mike Liao, the company has worked on large projects throughout the world. Starting from long span and tensile membrane structures, Geiger Engineers has branched out over the years into a range of specialties from designing sports facilities to providing engineering services for the entertainment industry.
A skylight is a light-permitting structure or window, usually made of transparent or translucent glass, that forms all or part of the roof space of a building for daylighting and ventilation purposes.
Mercedes-Benz Stadium is a multi-purpose stadium in Atlanta, Georgia, United States. Opened in 2017 as a replacement for the Georgia Dome, it is the home of the Atlanta Falcons of the National Football League (NFL) and Atlanta United FC of Major League Soccer (MLS). The stadium is owned by the state of Georgia through the Georgia World Congress Center Authority, and operated by AMB Group, the parent organization of the Falcons and Atlanta United FC. In 2016, the total cost of its construction was estimated at US$1.6 billion.
The 2014 NHL Heritage Classic was an outdoor regular season National Hockey League (NHL) game held indoor, part of the Heritage Classic series of outdoor NHL ice hockey games in Canada. It took place on March 2, 2014, in BC Place in Vancouver, with the Ottawa Senators facing off against the home team Canucks. It is the first "outdoor" game to be played in what technically is an indoor stadium, albeit one of a larger capacity than a typical NHL arena; BC Place is a retractable roof venue, and it is unknown if the stadium has the capabilities to keep its roof open during inclement weather. The game was televised nationally in Canada on CBC and nationally in the United States on NBCSN.
The National Hockey League (NHL) first held a regular season outdoor ice hockey game in 2003, and since 2008 the league has scheduled at least one per year.
It was on January 11, 1988 when the current site of the Australian Open tennis championships – then called the Australian National Tennis Centre at Flinders Park – opened its doors for the first day of championship play, featuring its first-of-its kind-in-tennis retractable roof over its center court stadium.