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
| Jul 19, 2012
BIM finally starting to pay off for AEC firms
In surveying Giants 300 firms about BIM, we went right for the jugular: Is BIM paying off—through cost savings, higher quality, or client satisfaction? Here’s what they told us.
| Jul 19, 2012
Contractors finally ‘moving off the bottom’
C and CM Agent + PM Giants 300 Firms also taking steps to improve project efficiency.
| Jul 19, 2012
The best states for a construction job
The top anticipated engineering and skilled labor shortages according to a survey of 2,223 construction industry professionals.
| Jul 19, 2012
Suffolk Construction launches subcontractor development series
Professional certificate program to provide core construction management skills to disadvantaged, minority, and women business enterprises.
| Jul 19, 2012
Construction begins on military centers to treat TBI and PTS
First two of several centers to be built in Fort Belvoir, Va. and Camp Lejeune, N.C.
| Jul 18, 2012
U.S. engineering firms set sail for foreign ports
Other E/EA Giants 300 firms are just dipping their toes into foreign waters, still looking for international business but choosing not to establish additional offices.
| Jul 18, 2012
Architecture giants spreading their wings
A/AE Giants 300 rankings reveal firms branching out globally, merging, adding services.
| Jul 18, 2012
Green expert Kats joins GreenWizard as an advisor
Kats' role is to help further expand GreenWizard’s impact in the sustainable construction industry.
| Jul 18, 2012
Construction employment stagnates in June
Lack of hiring in construction combined with job growth elsewhere threatens to create skilled-labor gap once contractors are ready to hire again.
| Jul 18, 2012
Legat & Kingscott relocates architecture/interior design office
Move enables the architecture/interior design firm to better serve its expanding clientele.