Codes, Standards, and Regulations
Codes, Standards, and Regulations
IDFX tests applied code literacy, not memorization of every section. Know the model-code hierarchy: IBC for building construction, NFPA 101 for life safety, ADA Standards for accessibility, ASHRAE for energy and ventilation, and local amendments that may be stricter. Classify occupancy, calculate occupant load from use and area, then determine exits, egress width, travel distance, common path, dead ends, door swing, panic hardware, fire-resistance, alarms, and sprinkler criteria. Accessibility includes routes, clear floor space, turning space, reach ranges, and toilet-room clearances.
Core rules
- Occupant load drives exits and width; do not confuse it with design headcount.
- A 32 in clear door width is a minimum; required egress capacity may demand more or additional exits.
- Keep required egress unobstructed and ensure exit signs and illumination.
- Check both the model code and the locally adopted edition.
Worked example
A sprinklered business space has 120 occupants. Using the common egress-width factor of 0.15 in per occupant for other egress components, required capacity is 18 in-but a single 36 in door is not enough because the occupant load exceeds the one-exit threshold. Provide at least two exits, each with a clear width of at least 32 in, and verify travel distance and common-path limits. The arithmetic is simple; the exit-count and door-swing checks are where candidates lose points.
Traps
Applying a corridor minimum without checking capacity; ignoring door swing and hardware; using gross area where net occupant load is required; and overlooking local amendments or change-of-use requirements.