How to read a life safety plan

A step-by-step guide to interpreting life safety drawings for plan review and code compliance

Life safety plans are specialized architectural drawings that show how a building protects occupants during fire and other emergencies. They consolidate information about fire-rated construction, means of egress, fire protection systems, and emergency signage into a single coordinated plan. These drawings are required for plan review submittals in most jurisdictions and serve as the primary tool for Authority Having Jurisdiction (AHJ) review.

Key statistics

Per NFPA data, the leading factors in fire deaths are failure to notify (no working alarms), blocked or inadequate egress paths, and failure of fire compartmentalization. Life safety plans address all three of these factors through coordinated design.

Step 1: Identify Occupancy Classifications

The IBC occupancy classification determines nearly every life safety requirement: construction type, fire separation, egress, sprinkler requirements, and alarm systems. Life safety plans should clearly label each space with its occupancy group.

A (Assembly)

Theaters, restaurants, churches, arenas

High occupant loads, panic risk, fixed seating egress

B (Business)

Offices, banks, clinics, educational above 12th grade

Moderate loads, typical egress requirements

E (Educational)

Schools K-12, daycare centers

Child occupants, special egress and fire alarm requirements

F (Factory)

Manufacturing, assembly plants, laundries

Hazardous materials, high fire load, industrial processes

H (High Hazard)

Chemical plants, paint shops, woodworking

Explosion/fire risk, special containment and suppression

I (Institutional)

Hospitals, prisons, nursing homes

Occupants cannot self-evacuate, defend-in-place strategy

M (Mercantile)

Retail stores, markets, gas stations

High transient loads, unfamiliar occupants

R (Residential)

Hotels, apartments, dormitories

Sleeping occupants, notification requirements

S (Storage)

Warehouses, parking garages, aircraft hangars

High fire load, limited occupants, rack storage heights

Step 2: Locate Fire-Rated Assemblies

Fire-rated walls and floors are shown on life safety plans using distinct line patterns. These assemblies compartmentalize the building to slow fire spread.

Fire Walls (2-4 hour)

Structural separation that divides a building into separate fire areas. Must extend from foundation to roof and resist building collapse on either side. Heavy solid line on plans.

Fire Barriers (1-2 hour)

Enclose exit stairways, exit passageways, horizontal exits, and shaft enclosures. Must extend from floor to underside of deck above. Long-dash line on plans.

Fire Partitions (1 hour)

Corridor walls, dwelling unit separations, tenant separations. Short-dash or dot-dash line on plans.

Smoke Barriers (1 hour)

Required in I-2 (healthcare) occupancies to create smoke compartments. Includes smoke and draft control doors. Dot-dot-dash line.

Horizontal Assemblies

Fire-rated floor/ceiling assemblies between occupancies. Rating must match the required occupancy separation per IBC Table 508.4.

Step 3: Trace Egress Paths

The means of egress has three components: the exit access (path to an exit), the exit (protected enclosure like a stairway), and the exit discharge (path from exit to public way). Life safety plans show the egress path from every occupied space.

Measure travel distance from the most remote point in each room to the nearest exit, verify against IBC Table 1017.2 maximums (200-300 feet depending on occupancy and sprinkler status)
Verify that dead-end corridors do not exceed maximum length (20 feet unsprinklered, 50 feet sprinklered per IBC 1020.4)
Check common path of egress travel, the distance before two separate paths become available (75 feet typical maximum)
Confirm required number of exits per floor (minimum 2 for most occupancies over 500 occupants or 49 occupants in some groups)
Verify exit separation: where 2 exits are required, they must be separated by at least 1/2 the diagonal distance of the floor area (1/3 with sprinklers)
Check that exit widths accommodate occupant load, 0.2 inches per occupant for stairs, 0.15 inches for level paths (IBC 1005.1)
Ensure exit doors swing in direction of egress travel when serving 50+ occupants

Step 4: Check Exit Signage Locations

Illuminated exit signs must be visible from every point along the means of egress. The life safety plan should show each sign location.

At every exit door

Signs required above or adjacent to every exit and exit access door

Along egress path

Where the direction of egress is not immediately apparent, directional signs with arrows are required

Maximum 100-foot visibility

If any point along the egress path is more than 100 feet from the nearest visible exit sign, additional signs are needed

Emergency illumination

Exit signs must remain illuminated for 90 minutes during power failure (battery backup or generator)

Step 5: Verify Fire Alarm Device Placement

Fire alarm devices include initiating devices (that detect fire) and notification appliances (that alert occupants). Placement requirements come from NFPA 72.

Manual Pull Stations

Required within 5 feet of each exit on the egress side. Mounted 42-48 inches AFF. Must be unobstructed and readily accessible.

Smoke Detectors

Required in elevator lobbies, mechanical rooms, electrical rooms, and in concealed spaces. Spacing per NFPA 72: 30-foot maximum for smooth ceilings.

Heat Detectors

Used in areas where smoke detectors would false alarm (kitchens, mechanical rooms, parking garages). Spacing depends on ceiling height and detector rating.

Horns/Strobes (Notification)

Must achieve 15 dB above ambient noise level. Strobes: 75 candela for corridors, 110-177 candela for large rooms. Ceiling-mount strobes follow different tables per NFPA 72.

Duct Smoke Detectors

Required in HVAC ducts serving over 2,000 CFM (per IMC). Located in supply and return air ducts to shut down air handling upon smoke detection.

Step 6: Review Sprinkler Coverage Areas

Life safety plans may show sprinkler coverage zones or reference the fire protection (FP) drawings. Key items to verify:

Light Hazard

One head per 200 SF, 15 ft max spacing

Offices, hotels, churches

Ordinary Hazard Group 1

One head per 130 SF, 15 ft max spacing

Restaurants, laundries, bakeries

Ordinary Hazard Group 2

One head per 130 SF, 15 ft max spacing

Mercantile, manufacturing

Extra Hazard

One head per 90-100 SF, 12 ft max spacing

Woodworking, plastics, flammable liquids

Step 7: Confirm ADA Egress Requirements

Accessible means of egress must be provided per IBC Section 1009. Key requirements include:

Each accessible space must have at least one accessible means of egress to an exit
Buildings with more than one exit require at least two accessible means of egress
Areas of refuge (or areas of rescue assistance) required in stairways where occupants cannot reach grade, sized for wheelchair spaces
Two-way communication required between area of refuge and fire command center
Elevators may serve as accessible means of egress only if they meet IBC 1009.4 requirements (standby power, water protection)
Accessible exit signs must include the International Symbol of Accessibility at areas of refuge

Common Life Safety Symbols

EXITExit Sign

Illuminated exit sign location (must be visible from 100 feet)

SDSmoke Detector

Photoelectric or ionization smoke detection device

HDHeat Detector

Fixed-temperature or rate-of-rise heat detection device

PSPull Station

Manual fire alarm pull station at exits (48" AFF typical)

H/SHorn/Strobe

Audible and visual notification appliance

●Sprinkler Head

Automatic fire sprinkler head (pendant, upright, or sidewall)

FEFire Extinguisher

Portable fire extinguisher location (75 ft max travel distance)

FDCFire Department Connection

Exterior Siamese connection for fire department supplemental supply

FAPFire Alarm Panel

Fire alarm control panel location (FACP)

AEDAED Location

Automated external defibrillator

Sources

IBC 2021, Chapter 10, Means of Egress

IBC 2021, Chapter 7, Fire and Smoke Protection Features

NFPA 72-2022, National Fire Alarm and Signaling Code

NFPA 13-2022, Standard for Installation of Sprinkler Systems

ADA/ABA Accessibility Guidelines, Chapter 2, Scoping Requirements

Keep exploring

Related references for fire, egress, and life safety review.

Fire Rating Guide

Walls, doors, and assembly fire ratings.

Egress Basics

Means of egress fundamentals.

How to Calculate Occupant Load

Determine occupant loads for egress design.

Fire Alarm Symbols Guide

Complete fire alarm symbol reference.

Fire Protection Drawing Review

Best practices for reviewing fire protection plans.

AI Fire & Life Safety Analysis

Automated egress, fire rating, and code compliance checks.

See Helonic on your drawings

Helonic's AI can analyze life safety plans to verify egress travel distances, check fire-rated wall continuity, validate exit sign coverage, and flag missing fire alarm devices, catching issues that manual review often misses.