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
Market Data | Jan 30, 2018
AIA Consensus Forecast: 4.0% growth for nonresidential construction spending in 2018
The commercial office and retail sectors will lead the way in 2018, with a strong bounce back for education and healthcare.
Architects | Jan 29, 2018
14 marketing resolutions AEC firms should make in 2018
As we close out the first month of the New Year, AEC firms have made (and are still making) plans for where and how to spend their marketing time and budgets in 2018.
Education Facilities | Jan 29, 2018
My day as a kindergartner
The idea of a kindergarten-only school presents both challenges and opportunities in regards to the design.
AEC Tech | Jan 29, 2018
thyssenkrupp tests self-driving robot for ‘last mile’ delivery of elevator parts
“With driverless delivery robots, we could fill a gap and get spare parts from our warehouses to the jobsite faster,” said thyssenkrupp SVP Ivo Siebers.
Architects | Jan 26, 2018
Stephen Ayers, FAIA, honored with the 2018 AIA Thomas Jefferson Award
The award honors significant contributions to public architecture.
Architects | Jan 26, 2018
Recipients for the 2018 Collaborative Achievement Award selected
The recipients will be honored at the AIA Conference on Architecture 2018 in New York City.
K-12 Schools | Jan 25, 2018
Cost estimating for K-12 school projects: An invaluable tool for budget management
Clients want to be able to track costs at every stage of a project, and cost estimates (current and life cycle) are valuable planning and design tools, writes LS3P's Ginny Magrath, AIA.
Architects | Jan 25, 2018
Four keys to designing autistic-friendly spaces
Autism, in part, gave us modern architecture, writes PDR’s Julie Troung.
Sports and Recreational Facilities | Jan 25, 2018
Virginia Beach: A surf town with a wave problem no more
A world-class surf park will highlight Virginia Beach’s new live-work-play development.
Multifamily Housing | Jan 24, 2018
Apartment rent rates jump 2.5% in 2017, led by small and mid-sized markets
The average price for one-bedroom units increased the most.