Beyond the door material, another important decision is determining whether a more sophisticated door system is required for the application. In the MasterFormat section 08 30 00, Specialty Doors and Frames, a number of door types are listed for special functions, access locations, sliding and folding hardware, and even pressure-resistant types. Among these, there are several mentioned by Building Teams for consideration today:
• Pivoted or hinged doors. Both pivots and hinges can be used interchangeably, although hinged, prefabricated doors are generally less expensive. The presentation of the door types is the key factor. A hinged door typically reveals a knuckle spanning 4½ inches, while a pivot door’s profile is much smaller, with a 1½-inch knuckle. (Means Illustrated Construction Dictionary defines a door knuckle as “one of the enlarged, protruding, cylindrical parts of a hinge through which the pin is inserted.) The pivot door also offers a higher level of durability, making it a common choice for commercial applications.
• Balanced doors. Ideal for windy climates, a balanced door is a more sophisticated, engineered system for exterior entrances. “The balanced door system is a complete assembly where the hanging and closing of the door is controlled by the door system, negating some of the effects of excessive wind conditions,” says Jim Berg, a veteran door systems consultant.
If a balanced door isn’t in the budget, then pivoted or hinged doors need to be designed with higher opening and closing forces, as more of the door leaf is exposed to the wind.
• Automatic and revolving doors. Automatic doors are commonly used to meet the requirements of the Americans with Disabilities Act, or simply to handle highly trafficked entrances, as in hospitals and grocery stores. Because the price difference between automatic and revolving doors is substantial, revolving doors are usually reserved for buildings with significant weather requirements.
Revolving doors can also be helpful in mitigating the effects of strong negative and positive air pressures created by the HVAC systems and outdoor conditions, which cause wear and tear to a typical door. Consequently, the number of service calls is reduced with revolving or vestibule door systems.
According to Studio 08 Principal Rick Lewis, the most common type of revolving door is the single-post door. However, “Many of the airports are now using a type that allows more people to be in the door unit at one time, to move more traffic,” he says. Today there are small, three- and four-wing models for lower-traffic applications, while the large, two-wing or three-wing automatic revolving doors are more common in retail centers, hospitals, and transportation centers.
In most applications, a low-energy power operator meeting ANSI A156.19 (Standard for Power Assist and Low Energy Power Operated Doors) is specified as an ADA-compliant installation. However, for industrial settings, a heavy-duty power operator compliant with ANSI A156.10 (American National Standard for Power Operated Pedestrian Doors) is used. The industrial types are often specified with a ramp and guides, as the doors generally don’t stop and reset if a person or object enters the sensory field.
While the lower energy operators do stop and reset, this action can eventually wear down the mechanism. “Currently, manufactured units are considerably better than the ones that first came out 20 years ago,” says Lewis. “However, an ANSI A156.10 unit requires a lot of maintenance because the door operator is used each time a person, cart, or motorized vehicle passes through the opening.” Lewis says there is considerable power and momentum in the door as an operator is functioning, and “this causes not only the operators to receive a lot of abuse, but also the doors and frames.”
While retrofitting ordinary doors into automatic doors can be difficult and expensive, there are cases where there is no way around the problem for certain types of buildings, such as churches, temples, mosques, and other religious institutions, which are now required by ADA standards to update their access points. +
Related Stories
| Mar 29, 2011
City's design, transit system can ease gas costs
Some cities in the U.S. are better positioned to deal with rising gas prices than others because of their design and transit systems, according to CEOs for Cities, a Chicago-based nonprofit that works to build stronger cities. The key factor: whether residents have to drive everywhere, or have other options.
| Mar 29, 2011
Chicago’s Willis Tower to become a vertical solar farm
Chicago’s iconic Willis Tower (formerly the Sears Tower) is set to become a massive solar electric plant with the installation of a pilot solar electric glass project.
| Mar 29, 2011
Read up on Amazon.com's new green HQ
Phase IV of Amazon’s new headquarters in Seattle is nearly complete. The company has built 10 of the 11 buildings planned for its new campus in the South Lake Union neighborhood, and is on-track for a 2013 grand opening.
| Mar 29, 2011
Portuguese architect Eduardo Souto de Moura wins Pritzker Architecture Prize
Portugese architect Eduardo Souto de Moura, whose precisely-honed buildings reflect the influence of the late Chicago modernist Mies van der Rohe, is the 2011 winner of the Pritzker Architecture Prize, the field's highest honor.
| Mar 25, 2011
Qatar World Cup may feature carbon-fiber ‘clouds’
Engineers at Qatar University’s Department of Mechanical and Industrial Engineering are busy developing what they believe could act as artificial “clouds,” man-made saucer-type structures suspended over a given soccer stadium, working to shield tens of thousands of spectators from suffocating summer temperatures that regularly top 115 degrees Fahrenheit.
| Mar 23, 2011
AIA adds 13 new contract documents to Documents-on-Demand service
Web-based solution adds 13 popular Architect’s Scope of Services Documents to AIA Documents-on-Demand, providing easy access to documents anytime, anywhere.
| Mar 23, 2011
After 60 years of student lobbying, new activity center opens at University of Texas
The new Student Activity Center at the University of Texas campus, Austin, is the result of almost 60 years of students lobbying for another dedicated social and cultural center on campus. The 149,000-sf facility is designed to serve as the "campus living room," and should earn a LEED Gold certification, a first for the campus.
| Mar 23, 2011
Architecture Billings Index shows nominal increase
The American Institute of Architects (AIA) reported the February Architecture Billings Index score was 50.6, up slightly from a reading of 50.0 the previous month. This score reflects a modest increase in demand for design services (any score above 50 indicates an increase in billings). The new projects inquiry index was 56.4, compared to a mark of 56.5 in December.
| Mar 22, 2011
The American National Standards Institute accredits Stantec for greenhouse gas verification
Stantec Consulting Ltd.’s Atmospheric Environment Group has been awarded accreditation by the American National Standards Institute (ANSI) for verification of assertions related to greenhouse gas (GHG) emissions. The Scope of Accreditation is for verification of emissions and removals at the organizational level for Group 1 – General.
| Mar 22, 2011
Mayor Bloomberg unveils plans for New York City’s largest new affordable housing complex since the ’70s
Plans for Hunter’s Point South, the largest new affordable housing complex to be built in New York City since the 1970s, include new residences for 5,000 families, with more than 900 in this first phase. A development team consisting of Phipps Houses, Related Companies, and Monadnock Construction has been selected to build the residential portion of the first phase of the Queens waterfront complex, which includes two mixed-use buildings comprising more than 900 housing units and roughly 20,000 square feet of new retail space.
