the essentials of egress presented by. schirmer engineering corporation 2 seminar scope code...

The Essentials of Egress

Presented by

Schirmer Engineering Corporation2

Seminar Scope

Code fundamentals for drawing reviews Terms and definitions Fire and life safety drawing review for

conditions of egress Handouts for comparison of 2006 IBC and

NFPA 101, Life Safety Code


So Far…

The fundamental program for the project is set.

The schematic design has been accepted.

Next step:– Develop the preliminary design.


Preliminary Design

Already determined are: The State/Local Codes If there is a Zoning/Planning Code If the project is in a Historic District If accessibility must be met (ADAAG –

ANSI A117.1)


Preliminary Design -Model Building Codes

ICC International Building Code (IBC)

BOCA BOCA National Building Code (BNBC)

ICBO Uniform Building Code (UBC) NFPA Building Construction and

Safety Code (NFPA 5000)Life Safety Code (NFPA 101)

SBCCI Standard Building Code (UBC)


Preliminary Design -Model Building Codes - ICC

ICC International Family of Codes

IBC, IRC, IMC, IPC, IFC, etc.

47 states & Dept. of Defense use IBC 42 states & DC use IFC 45 states & DC use IRC

Website – www.iccsafe.org


Preliminary Design -Model Building Codes - ICC

Website – www.iccsafe.org


Preliminary Design -Design Items to Check

Already checked are:– Site restrictions, e.g. easements?– Construction Type?– Occupancy Classification?– Maximum building area limits?– Maximum building height limits?– Sprinkler systems requirements?


Preliminary Design -Design Items to Check

But…what about the Means of Egress?


Terms & Definitions -Means of Egress

A continuous and unobstructed path of vertical and horizontal egress travel from any occupied portion of a building or structure to a public way. A means of egress consists of three separate and distinct parts: the exit access, the exit and the exit discharge.

(2006 IBC)


Public Way

A street, alley or other parcel of land open to the outside air leading to a street, that has been deeded, dedicated or otherwise permanently appropriated to the public for public use and which has a clear width and height of not less than 10 feet.

(2006 IBC)


Exit Access

That portion of a means of egress system that leads from any occupied portion of a building or structure to an exit.

(2006 IBC)


Exit Access and Exits


Exit

That portion of a means of egress system which is separated from other interior spaces of a building or structure by fire-resistance-rated construction and opening protectives as required to provide a protected path of egress travel between the exit access and the exit discharge.

(2006 IBC)


Types of Exits

Exits include exterior exit doors at ground level, exit enclosures, exit passageways, exterior exit stairs, exterior exit ramps and horizontal exits.


Exit Discharge

That portion of a means of egress system between the termination of an exit and a public way.

(2006 IBC)


Exits and Exit Discharge

.

(2006 IBC)


More Terms & Definitions -Exit Passageway

An exit component that is separated from other interior spaces of a building or structure by fire-resistance-rated construction and opening protectives, and provides for a protected path of egress travel in a vertical or horizontal direction to the exit discharge or public way.

(2006 IBC)


Accessible Means of Egress

A continuous and unobstructed way of egress travel from any accessible point in a building or facility to a public way.

(2006 IBC)


Area of Refuge

An area where persons unable to use stairways can remain temporarily to await instructions or assistance during emergency evacuation.

(2006 IBC)


Plan Review for Egress

Code Matrix Occupant Content (OLF’s) Number of Exits Exit Capacity (min. stair widths, door

widths, etc.)


Plan Review for Egress

Travel Distance Common Path of Travel Dead End Distance Swing of Doors (in direction of exit, …)


Egress –Occupant Load

The number of persons for which the means of egress of a building or portion thereof is designed.

(2006 IBC)


Use and Occupancy Classification

Assembly Group A Business Group B Educational Group E Factory Group F High-Hazard Group H Institutional Group I

Mercantile Group M Residential Group R Storage Group S Utility & Miscellaneous

Group U


Occupant Load Factors

Use/Function of Space NFPA ICC

2006 LSC IBC 2006

Table 7.3.1.2 T-1004.1.1

ft2 /occupant ft2 /occupant

Assembly – Gaming floors (keno, slots, etc.) 11 gross 11 gross

Assembly with fixes seats See Slide See Slide

Assembly without fixed seats

Concentrated (chairs only – not fixed) 7 net 7 net

Standing space 3 net 5 net

Unconcentrated (tables and chairs) 15 net 15 net

sarah rice

all about FUNCTION OF SPACE NOT if its a Group A or Group B building per Chpt 3 but how is the space going to be usedNR - not regulatedthe LSC has stuff the IBC doesn't and vice versa

sarah rice

these are not all of the occ load factors just samples to see how they work


Gross Floor Area

The floor area within the inside perimeter of the exterior walls of the building exclusive of vents shafts and interior courts . . .

(2006 IBC)


Net Floor Area

The actual occupied area not including unoccupied accessory areas such as corridors, stairways, toilet rooms, mechanical rooms and closets.

(2006 IBC)


Occupant Load Factors

Use/Function of Space NFPA ICC

2006 LSC IBC 2006

Table 7.3.1.2 T-1004.1.1

ft2 /occupant ft2 /occupant

Bowling centers, 5 persons/lane including 15 feet of runway

7 net 7 net

Business (e.g., offices) 100 gross 100 gross

Courtrooms – other than fixed seating areas NR 40 net

Dormitories 200 gross 50 gross

Educational

Classroom area 20 net 20 net

Shop and other vocational room areas (e.g., dormitories)

50 net 50 net


AREA = 30,074SF

BUSINESS OFFICE

STORE ROOM(3,000SF)

CONFERENCEROOM(3,000SF)


Egress –Minimum Number of Exits

Occupant Load per Story

LSC ICC

NFPA 101-2006 IBC 2006

Section 7.4.1.2 Table 1019.1

500 or less 2 2

501 – 1,000 3 3

Over 1,000 4 4


Effect of Partitions on Exit Count

Fig. 1004.1.1 again to explain number of exits if partitioned.

.

(2006 IBC)


Minimum Exit Widths

Stairs & Corridors – 44 inches

Doors – Clear width of 32 inches

There are exceptions for each.

(2006 IBC)


Minimum Exit Width for Stair

Fig. 1009.4(1) – min. exit width of stair

.START……………

(2006 IBC)


Measuring Door Clear Width

Fig. 1008.1.1(2) – min. exit width of door and clear width

Start…..

(2006 IBC)


Minimum Corridor Width

Fig. 1005.2 regarding corridor widths

.

(2006 IBC)


Determining Exit Capacity


Vertical Exits

Capacity is based on largest occupant count on one floor served by the stair; not cumulative.

Exception: when 2 or more floors converge into the stairwell.

Width cannot decrease in the direction of exit.


Convergent Occupants in Stairwell

Fig. 1004.5(2) To illustrate previous text slide.

.

(2006 IBC)


Egress –Exit Access Travel Distance

Exits shall be so located that the maximum length of exit access travel, measured from the most remote point to the entrance to an exit along the natural and unobstructed path of egress travel . . .

(2006 IBC)


Egress –Exit Access Travel Distances

Use Group LSC ICC

NFPA 101-2006 IBC 2006

Table A.7.6.1 Table 1016.1

Without sprinkler

With sprinkler

Without sprinkler

With sprinkler

feet feet feet feet

A 150 200 200 250

B 200 300 200 300

E 150 200 200 250

F-1 200 250 200 250

F-2 300 400 300 400


Egress –Buildings with One Exit (1 story)

Use Group Maximumnumber of stories

above grade

NFPANFPA 101-2006

ICCIBC 2006

Section 7.4.1.1 and occupancy chapters

Section 1019.2

occupants / feet of travel occupants / feet of travel

A 1 Story Two exits required 49 / 75

B 1 Story 100 / 100 49 / 75

E 1 Story Two exits required 49 / 75

F 1 Story NR / 50 49 / 75

H-2 1 Story Two exits required 3 / 25



I 1 Story Two exits required 10 /75

M 1 Story NR / 75 49 / 75

R 1 Story NR / NR 10 / 75

S 1 Story See occupancy Chpt 30 / 75


Egress –Buildings with One Exit (2 story)

Use Group Maximumnumber of stories

above grade

NFPANFPA 101-2006

ICCIBC 2006

Section 7.4.1.1 and occupancy chapters

Section 1019.2

occupants / feet of travel occupants / feet of travel

B 2 Stories Two exits required 49 / 75

F 2 Stories Two exits required 49 / 75

M 2 Stories NR / 50 49 / 75

S 2 Stories See occupancy Chpt 29 / 100

U 2 Stories Two exits required 49 / 75

R-2 2 Stories 4 dwelling units 50 feet


Egress –Common Path of Travel

The distance measured from the most remote point in a space to the point in the exit path where the occupant has access to two required exits in separate directions.

(2006 IBC Commentary)


Egress –Common Path of Egress Travel

Use Group LSC ICC

NFPA 101-2006 IBC 2006

Table A.7.6 Section 1014.3

W/out sprinkler With sprinkler W/out sprinkler With sprinkler

feet feet feet Feet

A 20/75 20/75 75 75

B 75 100 75 100

E 75 100 75 75

F 50 50 75 100

I-1 75 100 75 75

I-2 NR NR 75 75

I-3 50 100 100 100

M 75 100 75 75

R-1/R-2 35 50 75 75/125

S-1 50 100 75 100

S-2 NR NR 75 100


100'

75' MAX

50' MAX

_<

EXIT EXIT


Dead End Distance

Where more than one exit or exit access doorway is required, the exit access shall be arranged such that there are no dead end corridors greater than 20 feet in length.

(2006 IBC)


EXIT

"X"

EXIT


Egress –Dead End Corridors/Passageways

Use Group LSC ICC

NFPA 101-2006 (Table A.7.6) IBC 2006 (Section 1017.3)

Without sprinkler With sprinkler Without sprinkler With sprinkler

feet feet feet Feet

A 20 20 20 20

B 20 50 20 50

E 20 50 20 20

F 50 50 20 50

H 0 0 20 20

I-1 20 50 20 20

I-2 30 30 20 20

I-3 50 50 20 50

M 20 50 20 20

R-1/R-2 35 50 20 20

S-1 50 100 20 20

S-2 NR NR 20 20


Other Items for Egress Review

Fire Resistance of Egress Components (exit access corridors, passageways, etc.)

Opening Protectives (doors, through-penetrations, fire and smoke dampers, etc.)

Signage and Emergency Lighting Accessibility (areas of refuge, ramps, etc.) Remoteness of Exits


Egress –Corridor Fire Resistance Ratings

Use Group LSC ICC

NFPA 101-2006 IBC 2006

Section 7.1.3.1 & occupancy Chapters

Section 1017.1

W/out sprinkler With sprinkler W/out sprinkler With sprinkler

hours hours hours hours

A, B, E & F 1 1 1 0

H 1 1 N/P 1

I-1 1 0 NP 1

I-2 1 0 NP 0

I-3 1 0 NP 1

M 1 0 1 0

R 1 1/2 N/P 1

S & U 1 0 1 0


Additional Comparison of Egress –IBC and NFPA 101, LSC

Handout material

Thank You

the essentials of egress presented by. schirmer engineering corporation 2 seminar scope code...

Documents