ExAC Podcast | Examitect

A safe stair is a relationship between several dimensions, not just a familiar shape. We explore rise, run, nosing, width, headroom, and landings, then separate the purpose of a handrail from that of a guard. The discussion helps you picture the movement and the fall risk behind the requirements before working through a calculation.

Travel distance follows the route a person can actually walk. We look at how to identify the most remote point, trace a usable path, and apply the requirement for the occupancy. Fire separations and sprinklers also enter the discussion, showing how the protection provided can affect the distance allowed before someone reaches a way out.

Getting out of a dwelling unit can involve more than the main entrance. We look at the provisions for doors, operable windows, and balconies, including the conditions that make each useful as part of egress. The episode also explains why distinguishing houses from other small buildings is essential before using an allowance.

A question about doors or washrooms may really begin with occupant load. We look at how the assumed population of a space feeds into exit counts, widths, and fixture requirements. We also discuss who needs to be included in the count and why the use of the space still matters alongside the number of people.

An egress door, an exit, and a means of egress are related terms with different meanings. We work through them before looking at exit numbers, clear widths, and door swing. The examples show why the first step in a dimensional question is identifying exactly which part of the route the question is asking about.

Fire separation, fire-resistance rating, and fire-protection rating need to stay distinct when you work through Part 9. We revisit the concepts through continuous separations and protected openings, then look at the conditions around closures. The discussion shows how familiar fire-safety principles remain in place even when the requirements for a smaller building differ.

A crawl space or basement can bring requirements you might not expect from its name. We explore how height, area, and the number of levels affect their treatment, including provisions that send you to Part 3. The episode builds a useful habit: notice the handoff in the code and follow it instead of staying inside Part 9 by default.

A mezzanine can change the storey count and, with it, the requirements that apply to the whole building. We look at open and enclosed areas, the allowances for each, and situations with more than one mezzanine. The aim is to read the arrangement carefully and count the space the way the code requires.

Part 9 is detailed and practical, but its scope still needs to be checked first. We introduce housing and small buildings, the permitted occupancies, and the role of size in deciding whether the part applies. The episode also explains why its prescriptive approach can make it feel different from the more general requirements used for larger buildings.

A worked wall assembly brings Appendix D's additive method into focus. We follow the contributions of framing and protective layers, then consider what happens when a higher rating is requested. The episode closes Part 3 by connecting that detailed exercise to the wider topic of classification, fire protection, egress, health, and accessibility.