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
| Jan 31, 2012
KBE selected for school project in Waterbury, Conn.
Located adjacent to the existing elementary school, the $28 million, 82,000 s/f Pre-K to eighth Grade school is expected to host its first students in the fall of 2013.
| Jan 31, 2012
Construction Law Firm Allensworth & Porter, LLP adds May to the firm
Prior to joining Allensworth & Porter, May served as the staff attorney for the Texas Civil Justice League, and was responsible for drafting, analyzing, and tracking civil justice and business-related legislation during the 82nd Legislative Session.
| Jan 31, 2012
Skanska USA Civil promotes Bradley to southeast general superintendent
In Bradley’s new position, he will manage field operations for all Skanska Civil projects in the southeast.
| Jan 30, 2012
Siemens and Air-Ex Team deliver building controls training to Mt. San Antonio College students
Siemens contributes training modules and technology to support hands-on courses.
| Jan 30, 2012
Hollister Construction Services to renovate 30 Montgomery Street in Jersey City, N.J.
Owner Onyx Equities hires firm to oversee comprehensive upgrades of office building.
| Jan 27, 2012
Caterpillar reports record sales and profit for 4Q and full-year 2011
Momentum carries into 2012 with sales and revenues outlook raised to $68 to $72 billion.
| Jan 27, 2012
Smith Seckman Reid opens two new offices
Smith Seckman Reid, Inc. (SSR), an engineering design and facility consulting firm, has opened two new offices, one in Chicago, the other in Washington, D.C.
| Jan 27, 2012
BRB Architects designs new campus center for Molloy College
Intended to be the centerpiece of the College’s transformation from a commuter college to a 24-hour learning community, the “Public Square” will support student life with spaces such as a café, lounges, study rooms, student club space, a bookstore and an art gallery.
| Jan 27, 2012
Columbia University’s New Core Laboratory aims for LEED Silver
Construction manager Sordoni Construction Co. along with the design team of Payette Architects and Vanderweil Engineers will provide design and construction services to renovate the majority of the existing Core Lab building to create the new Lamont Center for Bio-Geochemistry.
| Jan 26, 2012
Three dead, 16 missing in Rio buildings collapse
The buildings, one 20 floors high, collapsed on Wednesday night in a cloud of dust and smoke just one block away from the city's historic Municipal Theater.
