1. ID 234 Building Codes
Fall 2011
Means of Egress
Chapter 3, part II

2. General planning

3. Key terms Building core Common path of travel Corridor Means of egress
Means of escape
Natural path of travel
Occupant load
Passageway
Stairway
Story
Tenant

4. Elements of the egress system
Exit Access – anything (occupied room, space, doorway, aisle, corridor, stair, or ramp) on the way to the exit
Exit – any protected, fully enclosed space between the exit access and the exit discharge
Exit discharge – any portion of a means of egress between the termination of the exit and the public way
Public way – 10’w x 10’h
Area of refuge – temporary holding space for an emergency evacuation

10. Exit passageways

13. Exit Access travel distance
Choose the most remote part of plan to the furthest exit

14. Exit Signs

15. Aisles and Accessways

16. Maximum number of occupants

17. Separation of Exits Your diagrams:
Indicate overall diagonal graphically and with number
Indicate actual separation graphically and with number

18. Half Diagonal Rule (1/3 with sprinklers)

19. Exit Widths

20. Exit Access Travel Distance

21. Travel Distance Example
Your diagram:
On title page
Show only longest path

22. Emergency Lighting Required when two or more exits are required
Emergency electrical system or battery
General exit lighting and exit signs must be lit at all times

23. Egress system capacity
Based on occupant load
Based on sprinklers

24. Occupancy plan

25. Use a key for specific occupancy types

27. Number of Exits

30. Calculations Total number of occupants per floor
Quantity and dimension of egress components
Number of toilets, lavatories

31. Calculating Occupant Load
Use Revit, if you dare
Create/import Occupancy Calculations schedule
Indicate specific occupant load for each room
Create 1/32” scale Occupancy Plan and add color scheme to show graphically

32. Or, use Excel spreadsheet

35. Accessibility in the egress system
Mostly about dimensional constraints
Some in the building code
Some in the accessibility code

36. Door Dimensions

37. Corridor clearances

38. Door clearances

39. Section 17 Restaurants

40. Restaurant seating: general planning

41. Section 25 Entrances

42. Another Checklist

43. Assignment #1
Fire stair layout

44. Use your studio project dimensions
Due October 11th
Use your studio project dimensions
Floor to floor heights
Thickness of exterior walls and interior partitions (they’re different)
Use your design to calculate the occupant load

45. Step 1: calculate occupant load

46. Step 2: Calculate dimension of egress components

47. Step 3: Design fire stair
Plans, sections (2), and hidden elevation of center guard rail/hand rail
To scale
Fully dimensioned
Printed in black and white on 24x36” paper

48. Homework for next week Read ch.s 5 and 6
List all spaces and their areas in your studio project