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
Architects | Sep 21, 2016
DLR Group broadens its practice range and market penetration with addition of Westlake Reed Leskosky
The merger, say company officials, creates “a global design leader” in a consolidating industry.
Architects | Sep 21, 2016
Design for the transition from thinking to creating
While heads-down work continues, the changing nature of learning and work has resulted in a shift toward frequent and spontaneous exchanges.
Codes and Standards | Sep 21, 2016
Healthy buildings becoming a key design priority for both architects and building owners
Nationwide survey finds nearly three of four architects cite health impacts influencing design decisions
Cultural Facilities | Sep 19, 2016
International competition recognizes insect-inspired design for Moscow Circus School
The proposal would make the school’s activities more transparent to the public.
Architects | Sep 19, 2016
A workplace designed for the innovation economy
Over the past 100 years, how we work has changed dramatically, and these changes have impacted workplace design.
Architects | Sep 16, 2016
Former architect now builds architectural wonders out of LEGO blocks
Adam Reed Tucker’s creations are currently on display at the Museum of Science and Industry.
Architects | Sep 15, 2016
Implicit bias: How the unconscious mind drives business decisions
Companies are tapping into the latest research in psychology and sociology to advance their diversity and inclusion efforts when it comes to hiring, promoting, compensation, and high-performance teaming, writes BD+C's David Barista.
Museums | Sep 14, 2016
Architectural model museum opens in Japan
The museum includes models from Japanese architects including Shingeru Ban, Kengo Kuma, and Riken Yamamoto.
Designers | Sep 13, 2016
5 trends propelling a new era of food halls
Food halls have not only become an economical solution for restauranteurs and chefs experiencing skyrocketing retail prices and rents in large cities, but they also tap into our increased interest in gourmet locally sourced food, writes Gensler's Toshi Kasai.
AEC Tech | Sep 6, 2016
Innovation intervention: How AEC firms are driving growth through R&D programs
AEC firms are taking a page from the tech industry, by infusing a deep commitment to innovation and disruption into their cultural DNA.