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

General planning

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

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

Exit passageways

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

Exit Signs

Aisles and Accessways

Maximum number of occupants

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

Half Diagonal Rule (1/3 with sprinklers)

Exit Widths

Exit Access Travel Distance

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

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

Egress system capacity Based on occupant load Based on sprinklers

Occupancy plan

Use a key for specific occupancy types

Number of Exits

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

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

Or, use Excel spreadsheet

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

Door Dimensions

Corridor clearances

Door clearances

Section 17 Restaurants

Restaurant seating: general planning

Section 25 Entrances

Another Checklist

Assignment #1 Fire stair layout

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

Step 1: calculate occupant load

Step 2: Calculate dimension of egress components

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

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