Efficiency is important in office Design, whether it’s improvements to an existing space or a new building. Swinging doors are typical, however in certain applications, a sliding door is allowable by code and can improve the plan. Should you use a Swinging doors or sliding doors in your design?
Swinging doors take up room to allow for them to open and close. Sliding doors are more compact. A swinging door will open up to a wall. Doors can open 180 degrees against a wall, but in a smaller office, there may not be room for this to occur. Remember to provide the necessary clearances around doors as described in the post “Clearance around a door”. In a space with millwork or cabinets, a swinging door in its open position will affect accessibility to millwork. Below are a few scenarios.
Office Design with 90 degree swinging door
Office design with 180 degree swinging door
ADA compliance affected. Room will require more room to meet door clearances.
Office design with sliding door
Space is more efficient allowing for a more functional space.
The sliding door is much more efficient. If located properly, it allows for additional wall space where the door would swing to place more furniture or more maneuverability within the space
In locations such as a breakroom, millwork or other elements may conflict with swinging doors. In the two examples below, one layout shows where a sliding door will improve the functionality of the space.
Breakroom with swinging vs sliding door
When is a sliding door allowed?
There are a few instances where sliding doors are allowed by code. The following are some examples based upon the 2018 IBC codes. check your local jurisdiction for current code adopted and their interpretation.
Per section 1010.1.2 Door Swing. – Egress doors shall be of the pivoted or side-hinged swinging type. Exceptions where this doesn’t apply:
Private garages, office areas, factory and storage areas with an occupant load of 10 or less.
Group I-3 occupancies used as a place of detention.
Critical or intensive Care patient rooms within suites or health care facilities.
Doors within or serving a single dwelling unit in Groups R-2 and R-3.
In other than Group H occupancies, revolving doors complying with Section 1010.4.1.
In other than group H occupancies, special purpose sliding, accordion or folding door assemblies complying with Section 1010.1.4.3. This pertains to specialty doors which are power operated etc. Example of this is in grocery stores. The doors typical have the ability to hinge during a emergency or when the power disrupts the operation of the door and remains in a closed position.
Power-operating doors in accordance with Section 1010.1.4.2.
Doors serving a bathroom within an individual sleeping unit in Group R-1.
In other Group H occupancies, manually operated horizontal doors are permitted in a means of egress from spaces with an occupant load of 10 or less.
Items in blue, exception 1 and 9 pertain to office spaces.
There are various solutions for sliding doors. Ensure the solution you select meets ADA requirements. Acoustical properties is another factor to consider when picking the type of sliding door. A typical barn door will not have acoustical properties as it doesn’t have a seal at the opening, so if this is a concern, do some research on the type of door system. There are numerous examples of acoustical sliding doors. One example that has acoustical properties is AD Systems.
Summary
When planning your next office, determine if sliding doors would be a solution to make your office design more efficient. Will it save space and make it more functional. Follow the examples above for reference but as always, refer to the local jurisdiction, the current ADA guidelines and a local professional to ensure your projects success.
As an Architect, I interact with clients, engineers and contractors who have acquired bits of information about Building Codes. Sometimes, those bits are misconceptions and regurgitated information. The building codes can be intimidating and have no beginning or end. To learn the code, the best way is jumping in feet first.
Upcoming Blog Posts
In the next series of blog posts, I will explore common simple and more complex Building Codes. Each City has adopted a code but most in Arizona use the IBC (International Building Code).
The issues to be addressed in the following blog posts are:
The item in bold is addressed in this post. As an Arizona Architect, most City’s jurisdictions work with the IBC (International Building Code). The code analysis is based upon the IBC.
Door Fire Rating
A door is part of the ‘Means of egress’ of a building. The wall rating determines the rating of the door assembly. A door and its components, glazing and hardware will have different required ratings. Wall ratings fall within 1 hour increments, ranging from 1 to 4 hours. The rating describes the ability of the wall to ‘prevent the spread of fire’ from adjacent spaces or buildings.
There are actually three main classifications of fire walls: Fire walls, Fire barriers and fire partitions.
Fire Wall – ‘A fire resistance-rated wall having protected openings, which restricts the spread of fire and extends continuously from the foundation to or through the roof, which sufficient structural stability under fire conditions to allow collapse of construction on either side without collapse of the wall.’Useful in fire separation of occupancy types.
Fire Barrier – ‘A fire-resistance-rated wall assembly of materials designed to restrict the spread of fire in which continuity is maintained’
Fire Partitions – ‘A vertical assembly of materials designed to restrict the spread of fire in which openings are protected.’
Door Fire Rating
Door Fire Rating – Glazing
Specialty Frame Assemblies
For glass doors that require 20-120 minute rated conditions, there are numerous manufacturers who have design and tested systems. A few examples are Safti First, Fireglass, Aluflam etc. They design window door assemblies with glazing for specific rated conditions. The glazing manufacturer determines the size of the glazing based upon its constraints. A few examples are links to various types of glazing available or manufacturers who can assist you to determine the best system. The size of the glazing will depend on the type of glazing they offer within their systems.
Fireglass.com – Firelite Plus – Available in 20 min to 3 hour rating
Pilkington – Pyrostop – Available in 20 min. to 3 hour rating
I recommend researching either with a system manufacturer to determine the type of door/window system and glazing type that best suites your project needs.
Summary
Fire rated doors and their glass required ratings are determined upon the required rated of the wall assembly. Door rating doesn’t quite match the wall rating as depicted in the example above. Windows within a rated door are restricted to only 100 sq. in. Sidelights can be as large as a window manufacturer ability to rate its glazing. To determine what is required for your project, hire an expert or contact a company specializing in fire rated assemblies.
As an Architect, I interact with clients, engineers and contractors who have acquired bits of information about Building Codes. Sometimes, those bits are misconceptions and regurgitated information. The building codes can be intimidating and have no beginning or end. To learn the code, the best way is jumping in feet first.
Upcoming Blog Posts
In the next series of blog posts, I will explore common simple and more complex Building Codes. Each City has adopted a code but most in Arizona use the IBC (International Building Code).
The issues to be addressed in the following Blog Posts are:
The item in bold is addressed in this post. As an Arizona Architect, most City’s jurisdictions work with the IBC (International Building Code). The code analysis is based upon the IBC.
Clearances Around a Door
The ADA (American with Disabilities Act), established in 1990 and in affect in 1988, establishes the minimal clearances required around a door to allow the building occupant to easily approach and open a door with ease. It begin when parents of children with disabilities who began to fight against the exclusion or segregation of their children to minimize the barriers created within public buildings.
The door clearances are depicted in the following vignettes. Click on image for enlarged view.
Door Swinging OUT or in direction of travel
Door Swinging IN
Both doors swing in Both doors swing out Door swinging in same direction
Summary
Clearance around a door is established by the ADA. The clearances allow for the ease of an occupant to open and pass through a door opening, whether on foot, in a wheelchair or using crutches. A door which swings inward generally increases the required clearances as shown on images above. Other effects like door closures, automatic door openers can affect the operation of a door, however maintaining the shown clearances makes it easier for the occupants and satisfies the current codes established.
As an Architect, I interact with clients, engineers and contractors who have acquired bits of information about Building Codes. Sometimes, those bits are misconceptions and regurgitated information. The building codes can be intimidating and have no beginning or end. To learn the code, the best way is jumping in feet first.
Upcoming Blog Posts
In the next series of blog posts, I will explore common simple and more complex Building Codes. Each City has adopted a code but most in Arizona use the IBC (International Building Code).
The issues to be addressed in the following Blog Posts are:
Door swing direction. Which way should the door swing, out of a room or in?
The item in bold to be addressed in this post. As an Arizona Architect, most City’s jurisdictions work with the IBC (International Building Code). The code analysis is based upon the IBC.
Door Swing Direction
A buildings exit pathway typically consists of and exit pathway with hallways containing doors from offices, restrooms, mechanical rooms, leading to the exterior. In certain scenarios, the doors can swing either in or out. In some cases, functionality within the space dictates a swing direction unless code overrides. Below is a graphic showing door swing IN versus OUT.
There are sliding doors, roll up doors, revolving doors, however ‘most’ of those do not meet code requirements. I say ‘most’ because there are some exceptions and some manufacturers who have come up with creative solutions around this issue. Note in the graphic above, the door swinging out or into the hallway would block circulation. There is code requirements for clear hallway width, which will be discussed in upcoming blog posts. In this scenario, swinging into the office was preferable. Each office was small enough to allow doors to swing in.
Hinged (swinging) doors required unless:
Private garages, office areas, factory and storage areas with an occupant load of 10 or less.
Group I-3 Occupancies used as a place of detention
Critical or intensive care patient rooms within suits of health care facilities
Doors serving single dwelling unit (apartments/child care) under specific occupancy count (see code)
Doors serving a bathroom in Occ. R-1 (residential)
etc. The code goes into more details with exceptions
The factors which typically dictate the direction of the door swing are as follows:
Number of occupants.
Type of Occupancy
Hazardous condition of room
Number of occupants is determined by Occupancy type. For instance, the code has a table which calculates the number of occupants per s.f. For example, an office space of 4,000 s.f. would have an occupant load of 4000/100 or 40 occupants. See example below.
When occupant load is 50 or greater, doors shall swing in direction of travel or ‘out’.
Office Scenario
In the example below, each office may have less than 50 occupants. Those individual office doors swing in. The accumulation of all office occupants however exceeds 50 occupants. The door out of the general office area to the main exit corridor (in dark red) would need to swing ‘out’.
Other factors such as hazardous conditions can dictate the swing of a door. For example, within an electrical room, when the overall power exceeds 1200A, doors must swing in direction of travel.
Summary
What is the reasoning for swinging doors in the direction of travel in larger occupant loads or hazardous conditions? Imagine you are at an event with over 50 people and an emergency occurs, such as a fire. If you are the first person to reach the door and all 50 people rush in panic to the exit door at the same time, it would be difficult to swing the door towards yourself. Everyone would be pushing to move forward and out of the space. Therefore, swinging out would be easier to open. The code is created, reviewed and modified from years of learning from past mistakes.
When learning building codes, once you begin digging into the code, it begins to make sense. In regards to door swing, swinging in the direction of travel or outward will work for all conditions in the code. However when it is not required, such as in a small office, storage room or bedroom, functionally it may make sense to swing into the room. Look at how many occupants are within the room and determine if the room is a hazardous condition. When in doubt, rely on an Arizona Architect to explore the code and assist you.
