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Today at the usual hour we explore the literature, standards and codes that inform the design, construction, safety and sustainability of interior ceiling structures.
Educational classroom ceilings are shaped less by bold engineering and more by decades of accumulated institutional experience and unwritten tradition. Acoustics dominate: generations of teachers complained about echo and poor speech intelligibility, so by the 1950s–60s, suspended acoustic tile systems on metal grids became the default.
Case histories—fire tragedies like Our Lady of the Angels (1958) and later the Station nightclub fire—pushed strict flame-spread ratings, reinforcing mineral-fiber tiles and sprayed fireproofing on structure. Height settled around 9–10 ft (2.7–3 m) because pre-1970s HVAC systems needed plenum space above grids, and higher ceilings raised heating costs during the 1973 oil crisis; those budget lessons stuck.
Daylight and glare studies from the 1990s onward encouraged flat, matte white surfaces to diffuse light without hot spots. Modern codes merely codify what thousands of past classrooms already “already worked”: quiet, fire-safe, affordable, and bright enough. Tradition, filtered through decades of trial, error, and budget sign-offs, quietly dictates the design more than any single regulation.
Use the login credentials at the upper right of our home page.
In the United States, where the International Building Code (IBC) or its variants sets the standard, ceiling heights for habitable spaces and corridors—this includes most square footage in educational facilities—can be no lower than 7 feet 6 inches (2.29 m). Basements and non-habitable spaces may be as low as 7 feet 0 inches.
There is no single nationwide building code that directly mandates a specific maximum or minimum height for an auditorium, however. The allowable height of an auditorium (measured as floor-to-ceiling height or story height) is determined by a combination of the adopted model building code and fire code in that jurisdiction, along with the building’s occupancy classification, construction type, sprinkler protection, and sometimes egress/accessible means of egress requirements.
Sam Zell (1941–2023), the billionaire real estate investor and founder of Equity Group Investments, was a proud alumnus of the University of Michigan, earning both his B.A. (1963) and J.D. (1966) there. While an undergraduate, he managed apartment buildings and became a notable figure in campus entrepreneurship.
Zell and his fraternity brother Robert Lurie maintained a lifelong partnership that began at Michigan.He remained one of U-M’s most generous donors: the business school’s entrepreneurship program is named the Samuel Zell & Robert H. Lurie Institute for Entrepreneurial Studies, and he funded the Zell Lurie Founders Fund. The university awarded him an honorary doctorate in 2003 and he frequently returned to teach and mentor students.
IES Standards Open for Public Review
Standard Practice on Lighting for Educational Facilities
Recommended Practice: Lighting Retail Spaces
IES Method for Determining Correlated Color Temperature
Today we feature the catalog of the Illumination Engineering Society — one of the first names in standards-setting in illumination technology, globally* with particular interest in its leading title IES LP-1 | LIGHT + DESIGN Lighting Practice: Designing Quality Lighting for People and Buildings.
From its prospectus:
“…LIGHT + DESIGN was developed to introduce architects, lighting designers, design engineers, interior designers, and other lighting professionals to the principles of quality lighting design. These principles; related to visual performance, energy, and economics; and aesthetics; can be applied to a wide range of interior and exterior spaces to aid designers in providing high-quality lighting to their projects.
Stakeholders: Architects, interior designers, lighting practitioners, building owners/operators, engineers, the general public, luminaire manufacturers. This standard focuses on design principles and defines key technical terms and includes technical background to aid understanding for the designer as well as the client about the quality of the lighted environment. Quality lighting enhances our ability to see and interpret the world around us, supporting our sense of well-being, and improving our capability to communicate with each other….”
The entire catalog is linked below:
Illumination technologies run about 30 percent of the energy load in a building and require significant human resources at the workpoint — facility managers, shop foremen, front-line operations and maintenance personnel, design engineers and sustainability specialists. The IES has one of the easier platforms for user-interest participation:
IES Standards Open for Public Review
Because the number of electrotechnology standards run in the thousands and are in continual motion* we need an estimate of user-interest in any title before we formally request a redline because the cost of obtaining one in time to make meaningful contributions will run into hundreds of US dollars; apart from the cost of obtaining a current copy.
We maintain the IES catalog on the standing agendas of our Electrical, Illumination and Energy colloquia. Additionally, we collaborate with experts active in the IEEE Education & Healthcare Facilities Committee which meets online 4 times monthly in European and American time zones; all colloquia online and open to everyone. Use the login credentials at the upper right of our home page to join us.









Issue: [Various}
Category: Electrical, Energy, Illumination, Facility Asset Management
Colleagues: Mike Anthony, Gary Fox, Jim Harvey, Kane Howard, Glenn Keates, Daleep Mohla, Giuseppe Parise, Georges Zissis
* “Brownian Motion” comes to mind because of the speed and interdependencies.
LEARN MORE:
Illuminating Engineering Society Welcomes New Director of Development
Shayna Bramley Brings 21 years of Lighting Industry Experience to IESTo learn more, to go: https://t.co/YApdTPvR8E pic.twitter.com/PGDCtO4jrC
— Illuminating Engineering Society (@The_IES) December 26, 2018
The LD+A editorial and sales team members just couldn’t resist visiting Bugsy and Meyer’s Steakhouse (covered in the December 2021 issue) while in Las Vegas for LightFair! Read up on the details of the shadowy project here: https://t.co/7eoLPT69Dx #TheIES #LightFair2022 #lighting pic.twitter.com/uWmolsNpMz
— Illuminating Engineering Society (@The_IES) June 22, 2022

“Prometheus Bound” | Thomas Cole (1847)
NFPA 72 National Fire Alarm and Signaling Code is one of the core National Fire Protection Association titles widely incorporated by reference into public safety legislation. NFPA 72 competes with titles of “similar” scope — International Fire Code — developed by the International Code Council. We place air quotes around the word similar because there are gaps and overlaps depending upon whether or not each is adopted partially or whole cloth by the tens of thousands of jurisdictions that need both.
Our contact with NFPA 72 dates back to the early 2000’s when the original University of Michigan advocacy enterprise began challenging the prescriptive requirements for inspection, testing and maintenance (IT&M) in Chapter 14. There are hundreds of fire alarm shops, and thousands of licensed fire alarm technicians in the education facility industry and the managers of this cadre of experts needed leadership in supporting their lower #TotalCostofOwnership agenda with “code-writing and vote-getting”. There was no education industry trade association that was even interested, much less effective, in this space so we had to do “code writing and vote getting” ourselves (See ABOUT).
Code writing and vote getting means that you gather data, develop relationships with like minded user-interests, find agreement where you can, then write proposals and defend them at NFPA 72 technical committee meetings for 3 to 6 years. Prevailing in the Sturm und Drang of code development for 3 to 6 years should be within the means of business units of colleges and universities that have been in existence for 100’s of years. The real assets under the stewardship of these business units are among the most valuable real assets on earth.
Consider the standard of care for inspection, testing and maintenance. Our cross-cutting experience in over 100 standards suites allows us to say with some authority that, at best the IT&M tables of NFPA 72 Chapter 14 present easily enforceable criteria for IT&M of fire alarm and signaling systems. At worst, Chapter 14 is a solid example of market-making by incumbent interests as the US standards system allows. Many of the IT&M requirements can be modified for a reliability, or risk-informed centered maintenance program but fire and security shops in the education industry are afraid to apply performance standards because of risk exposure. This condition is made more difficult in large universities that have their own maintenance and enforcement staff. The technicians see opportunities to reduce IT&M frequencies — thereby saving costs for the academic unit facility managers — the enforcement/compliance/conformity/risk management professionals prohibit the application of performance standards. They want prescriptive standards for bright line criteria to make their work easier to measure.
While we have historically focused on Chapter 14 we have since expanded our interest into communication technologies within buildings since technicians and public safety personnel depend upon them. Content in Annex G — Guidelines for Emergency Communication Strategies for Buildings and Campuses — is a solid starting point and reflects of our presence when the guidance first appeared in the 2016 Edition. We shall start with a review of the most recent transcript of the NFPA Technical Committee on Testing and Maintenance of Fire Alarm and Signaling Systems
NFPA 72 First Draft Meeting (A2024)
Public Emergency Reporting Systems (SIG-PRS) First Draft
Public comment of the First Draft of the 2025 Edition is receivable until May 31, 2023. As always, we encourage direct participation in the NFPA process by workpoint experts with experience, data and even strong opinions about shortcomings and waste in this discipline. You may key in your proposals on the NFPA public input facility linked below:
You will need to set up a (free) NFPA TerraView account. Alternatively, you may join us any day at 11 AM US Eastern time or during our Prometheus or Radio colloquia. See our CALENDAR for the online meeting.
Issue: [15-213]
Category: Fire Safety & Security, #SmartCampus, Informatics
Colleagues: Mike Anthony, Joe DeRosier, Josh Elvove, Jim Harvey, Marcelo Hirschler
More
2013 NFPA 72 National Fire Alarm and Signaling Code (357 pages)
TIA-222 Standard For Towers And Antenna Supporting Structures
New update alert! The 2022 update to the Trademark Assignment Dataset is now available online. Find 1.29 million trademark assignments, involving 2.28 million unique trademark properties issued by the USPTO between March 1952 and January 2023: https://t.co/njrDAbSpwB pic.twitter.com/GkAXrHoQ9T
— USPTO (@uspto) July 13, 2023
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