Door Types
Commercial Glass Door Types
Commercial glass doors serve different functions and traffic patterns. The five major types each have distinct characteristics, advantages, and ideal applications. Understanding these differences is the foundation for selecting the right door for your building entrance.
Herculite (All-Glass) Doors
Premium AestheticHerculite doors are made from a single piece of heavy tempered glass -- typically 1/2-inch or 3/4-inch thick -- with minimal metal hardware.
Ideal Applications
High-end retail, professional offices, galleries, luxury hospitality, and any entrance where visual transparency and architectural elegance are priorities.
Key Considerations
Higher cost than framed doors. Requires precision fabrication (all holes and cutouts must be made before tempering). Door weight requires robust pivot hardware. Not suitable for fire-rated applications in standard configurations.
Aluminum-Framed Glass Doors
Most CommonThe workhorse of commercial entrances. An aluminum frame surrounds a tempered or insulated glass panel, providing structural support, weatherstripping.
Ideal Applications
Storefronts, office buildings, medical facilities, schools, government buildings, restaurants, and the vast majority of commercial entrances.
Key Considerations
Standard aluminum frames conduct heat -- specify thermally broken frames for energy-code compliance. Narrow-stile doors provide a more modern appearance but have less surface area for hardware mounting.
Automatic Sliding Glass Doors
High TrafficMotorized doors that open and close automatically in response to motion sensors, push plates, or access control systems.
Ideal Applications
Retail entrances, grocery stores, medical facilities, airports, hotels, and any high-traffic entrance where hands-free operation improves flow and accessibility.
Key Considerations
Require overhead structural support for the track and motor. Need dedicated electrical connection. Require regular maintenance of motors, sensors, and track systems. Must have breakaway capability for emergency egress.
Revolving Glass Doors
Energy EfficientThree or four glass wings rotate around a central shaft within a cylindrical enclosure.
Ideal Applications
High-rise office lobbies, hotels, hospitals, and any building where HVAC energy loss through the entrance is a significant concern. Particularly effective in the DMV where summer cooling loads and winter heating loads are both substantial.
Key Considerations
Require significant floor space for the enclosure. Must include adjacent swing doors for ADA accessibility (standard revolving doors are not ADA-compliant as a sole means of entrance). Higher installation cost. Require specialized maintenance.
Balanced Glass Doors
Wind ResistantBalanced doors use an offset pivot point (approximately one-third of the way from the hinge edge) rather than edge-mounted hinges.
Ideal Applications
Building entrances exposed to high wind conditions, tall building lobbies where stack effect creates pressure differentials, and entrances where a standard door would be difficult to open due to building pressurization.
Key Considerations
Requires a balanced door header and special pivot hardware. The offset pivot reduces the clear opening width compared to a conventionally hinged door of the same size. Higher cost than standard hinged doors.
Accessibility
ADA Compliance Requirements for Glass Doors
The Americans with Disabilities Act (ADA) establishes mandatory accessibility standards for commercial entrances. Non-compliance exposes businesses to legal liability, fines, and costly retrofits. Every commercial glass door installation should be designed for ADA compliance from the outset.
Clear Opening Width
Minimum 32 inches when the door is open 90 degrees (measured between the face of the door and the opposite door stop). A 36-inch door provides a 34-inch clear opening and is the recommended standard for new construction.
Opening Force
Interior doors: maximum 5 pounds of force to fully open. Exterior doors are exempt from the force requirement but must comply with all other ADA provisions. Fire-rated doors may require up to the minimum force necessary to close and latch the door for fire protection.
Hardware
All operating hardware must be operable with one hand, without tight grasping, pinching, or twisting of the wrist. This eliminates round knobs. Acceptable hardware includes lever handles, push/pull bars, panic bars, and touchless automatic operators.
Threshold Height
Maximum 1/2-inch threshold height (1/4 inch for non-beveled edges). Beveled thresholds with a maximum slope of 1:2 are required for any threshold above 1/4 inch. Flush thresholds are preferred for wheelchair accessibility.
Bottom Rail / Kick Plate
Glass doors must have a smooth surface on the push side within 10 inches of the floor to accommodate wheelchair footrests. This is typically achieved with a bottom rail or kick plate that prevents feet from catching under the door.
Visibility
Full-glass doors and sidelights must include visual indicators (decals, bands, or etching) between 30 and 36 inches above the floor to make the glass visible to people with low vision. Two-inch-wide horizontal bands or logos are common solutions.
Maneuvering Clearance
Adequate floor space must be provided on both sides of the door for wheelchair approach, opening, and passage. The specific dimensions depend on door type (push/pull) and approach direction (front, side, latch side). This often governs the layout around the door more than the door itself.
Life Safety
Panic Hardware and Exit Devices
Panic hardware enables immediate emergency egress by pushing a single horizontal bar. The International Building Code requires panic hardware on doors serving spaces with occupancy loads of 50 or more people and on doors in the means of egress from assembly and educational occupancies.
For glass doors, panic hardware comes in several configurations that balance safety compliance with the clean aesthetic that commercial glass doors provide.
Rim Exit Devices
Surface-mounted on the interior face of the door. A horizontal push bar retracts a latch at the door edge. The most common type for aluminum-framed glass doors. Visible hardware -- provides a clear visual cue for egress direction.
Concealed Vertical Rod Devices
Latching rods extend vertically into the header and threshold from within the door stile. The push bar retracts both rods simultaneously. Preferred for double doors without center mullions because no astragal or coordinator is needed.
Touchbar Exit Devices
A slim, low-profile push bar designed for all-glass (herculite) doors. The bar mounts directly to the glass with through-bolt fittings. Provides the clean aesthetic that herculite doors demand while meeting panic hardware requirements.
Motorized Exit Devices
Electrically powered exit devices that can be integrated with access control systems. The door latches automatically when closed and releases upon push-bar activation, card reader signal, or fire alarm. Required in buildings with electronic access control at exits.
Expert Tip: Panic Hardware Coordination
Panic hardware must be specified simultaneously with the glass door order. On herculite doors, all through-bolt holes must be drilled before the glass is tempered -- they cannot be added afterward. On framed doors, the stile width must accommodate the exit device. Failing to coordinate these requirements is one of the most common (and costly) mistakes in commercial glass door projects.
Fire Safety
Fire-Rated Glass Door Options
Where building codes require fire-rated door assemblies -- corridor walls, stairwell enclosures, occupancy separations -- the entire assembly (glass, frame, hardware, and seals) must be tested and listed as a unit. Standard tempered glass is not fire-rated and will fail within minutes of fire exposure.
| Glass Type | Fire Rating | Radiant Heat Protection | Best Application |
|---|---|---|---|
| Wired Glass | 45-90 min | No | Legacy installations (limited new use due to impact safety concerns) |
| Ceramic Glass (Pyran, FireLite) | 20-180 min | No | Doors and sidelights where radiant heat protection is not required |
| Intumescent Laminated (SuperLite) | 20-120 min | Yes | Doors in rated walls where radiant heat must be blocked |
| Insulated Fire-Rated Glass | 60-120 min | Yes | Large glass panels in fire-rated walls with energy performance needs |
Energy Efficiency
Energy Performance and Weatherstripping
Commercial glass doors are a significant point of energy loss in building envelopes. Air infiltration around the door perimeter and heat transfer through the glass and frame contribute to increased HVAC costs. In the DMV climate (IECC Zone 4A), both heating and cooling seasons create year-round energy demands on commercial entrances.
Modern commercial glass doors address energy performance through four primary strategies.
Insulated Glass Units
Double-pane glass with argon gas fill reduces conductive and convective heat transfer by 40-50% compared to single-pane glass. Low-E coatings further reduce radiant heat transfer. For the DMV climate, insulated glass in commercial doors is now required by energy code for most applications.
Thermally Broken Frames
Standard aluminum frames conduct heat readily -- the frame can be the weakest thermal point in the door assembly. Thermally broken frames incorporate a non-conductive polyamide strip between the interior and exterior aluminum sections, reducing frame heat transfer by up to 60%. Required by IECC energy code for commercial applications in Zone 4A.
Comprehensive Weatherstripping
Quality weatherstripping at all four door edges reduces air infiltration to near zero when the door is closed. Brush seals, compression seals, and magnetic seals are used depending on the door type and gap conditions. Weatherstripping is the most cost-effective energy improvement for existing commercial glass doors.
Vestibule Design
An enclosed vestibule (airlock) with two sets of doors creates a buffer zone that prevents direct air exchange between interior and exterior. Energy codes require vestibules for buildings in climate zones 3 through 8 (which includes the DMV) unless the building has a revolving door or the entrance serves fewer than a specific number of occupants.
Security
Security Ratings and Glass Options
Standard tempered glass in commercial doors provides impact safety (it breaks into small fragments rather than shards) but does not resist forced entry. When security is a concern -- as it increasingly is for DMV businesses -- several glass and hardware upgrades provide meaningful protection.
Laminated Security Glass
Two or more glass layers bonded with a tough PVB or SGP interlayer. Even when the glass cracks from impact, the interlayer holds the fragments together, maintaining a barrier. Standard security laminate resists multiple impacts from blunt objects. Available in various thicknesses from basic security to forced-entry resistant.
Security Film Retrofit
Thick polyester film (8-14 mil) applied to existing glass doors provides impact resistance similar to laminated glass at lower cost. The film holds shattered glass in place, delaying entry. Most effective when combined with an anchoring system that secures the film to the door frame. A practical security upgrade for existing installations.
Multi-Point Locking
Instead of a single latch point, multi-point locks engage at two or three positions along the door edge -- typically top, center, and bottom. This distributes forced-entry loads across the door assembly and significantly increases resistance to pry-bar attacks. Available for both framed and herculite glass doors.
Access Control Integration
Electric strikes, magnetic locks, and card reader systems control access while maintaining emergency egress capability. Modern access control integrates with building security systems for audit trails, scheduled locking, and remote management. Essential for DMV offices and government-adjacent facilities with security requirements.
Details
Threshold and Bottom Rail Options
The threshold is the interface between the door and the floor, and it affects ADA compliance, weatherstripping effectiveness, and the overall appearance of the entrance. Bottom rails protect the glass edge at floor level and provide the smooth push-side surface required by ADA.
Flush Threshold
The threshold sits flush with the finished floor on both sides. Provides the best wheelchair accessibility and cleanest appearance. Requires careful coordination with floor finishes during construction. Drainage must be addressed for exterior doors to prevent water intrusion.
Saddle Threshold
A raised threshold (maximum 1/2 inch per ADA) that creates a positive weather seal. Beveled edges allow wheelchair passage. The most common threshold type for exterior commercial doors because it provides a reliable seal against water and air infiltration.
Thermal Break Threshold
An insulated threshold with a non-conductive separator between interior and exterior metal sections. Prevents cold bridging at the floor line, which is a significant energy loss point in commercial entrances. Required by energy codes in the DMV climate zone for many applications.
Standard Bottom Rail
A 4-inch to 6-inch aluminum rail at the bottom of the glass panel. Protects the glass edge, provides a mounting surface for door sweeps, and satisfies the ADA smooth-surface requirement. The standard choice for framed commercial glass doors.
Extended Bottom Rail
A 10-inch bottom rail that provides enhanced kick-plate protection and a larger surface area for the ADA push-side requirement. Preferred for high-traffic doors where wheelchair footrests and foot traffic create wear on the door bottom. Also provides a more substantial visual base for the door.
Common Questions
Frequently Asked Questions
What is the most common type of commercial glass door?
The aluminum-framed glass door is the most common commercial glass door in the DMV area. It combines durability, code compliance, and cost-effectiveness in a versatile package that works for storefronts, office entrances, and interior corridors. For a more upscale appearance, herculite (all-glass) doors with minimal hardware provide a premium frameless aesthetic commonly seen in high-end retail and professional offices in DC, Tysons, and Bethesda.
Are commercial glass doors required to be ADA compliant?
Yes. Under the Americans with Disabilities Act, commercial glass doors in places of public accommodation must meet specific requirements: a minimum 32-inch clear opening width (36 inches is recommended), maximum 5 pounds of opening force for interior doors, lever-style or push/pull hardware (no round knobs), a smooth bottom rail at least 10 inches high for wheelchair footrest clearance, and visibility markers or decals on full-glass doors so they are visible to people with low vision. Automatic doors satisfy ADA requirements by eliminating the need to physically open the door.
What type of glass is required in commercial doors?
All glass in commercial doors must be safety glazing -- either tempered glass or laminated glass -- per the International Building Code (IBC) Chapter 24 and CPSC 16 CFR 1201. Tempered glass is the most common choice because it is four to five times stronger than annealed glass and breaks into small, relatively harmless fragments. Laminated glass is used when security, sound reduction, or hurricane resistance is required. Fire-rated doors require specialized fire-rated glass such as ceramic glass or wired glass in listed assemblies.
How do I choose between automatic sliding doors and automatic swinging doors?
Automatic sliding doors are preferred for high-traffic entrances because they handle two-way traffic efficiently, require no door swing clearance, and provide a wide opening. They are the standard for retail stores, medical facilities, and grocery stores. Automatic swinging doors are better suited for lower-traffic entrances with limited width, retrofit applications where sliding door headers cannot be installed, or locations where the building code requires a fire-rated entrance. Both types meet ADA accessibility requirements.
What is panic hardware and when is it required on glass doors?
Panic hardware (also called exit devices or crash bars) is a door-opening mechanism that allows immediate egress by pushing a horizontal bar across the interior face of the door. It is required by the IBC on doors serving spaces with occupancy loads of 50 or more people. In the DMV area, this applies to most commercial glass doors in restaurants, retail stores, assembly spaces, and office buildings. Panic hardware on glass doors can be rim-mounted (surface-applied) or concealed (recessed into the door rails), and must be compatible with the specific glass door system.
Can commercial glass doors be energy efficient?
Yes. Modern commercial glass doors achieve good energy performance through several features: insulated glass units (double-pane with argon gas) reduce heat transfer through the glass; thermally broken aluminum frames prevent heat conduction through the metal frame; comprehensive weatherstripping at all four edges seals against air infiltration; and low-E coatings on the glass reduce solar heat gain in summer and heat loss in winter. For the DMV climate zone (IECC Zone 4A), energy codes require commercial glass doors to meet specific U-factor and SHGC requirements.
How long does it take to replace a commercial glass door?
Standard aluminum-framed glass door replacement typically takes 4 to 8 hours per opening, including removal of the existing door, frame adjustments if needed, installation of the new door and hardware, and adjustment and testing. Automatic door systems take 1 to 2 days due to the electrical connections, sensor programming, and safety testing required. Custom herculite doors may require 2 to 4 weeks for fabrication before installation. We schedule commercial door installations to minimize disruption to your business operations.
By the Expert Glass Repair Team
Serving the DMV since 2004 -- DC, Northern Virginia & Maryland
Expert Glass Repair installs, replaces, and repairs commercial glass doors throughout Washington DC, Northern Virginia, and Maryland. From single storefront doors to multi-opening automatic entrance systems, our team handles all commercial door types with full code compliance. Fully Insured.
Related Guides
Need a Commercial Glass Door?
We provide free on-site assessments for commercial glass door projects throughout DC, Northern Virginia, and Maryland. Our team evaluates your entrance, reviews code requirements, and recommends the right door system for your building.