Code Reference(s):

NBC20, Div. B Table 3.1.3.1.

Subject:

Table 3.1.3.1. Major Occupancy Fire Separations

Title:

Removal of requirements for higher fire-resistance rating (FRR) in EMTC major occupancy separations

Description:

Extending application of the current requirements for fire-resistance rating in major occupancy fire separations of EMTC buildings to all newly proposed occupancy types would prove to be cumbersome and problematic. More importantly, upon deeper analysis it was determined that these requirements were historically introduced as a compensatory measure of a larger suite of code changes and are non-technical in nature. The requirements for fire-resistance ratings contained in Article/Table 3.1.3.1. have traditionally been determined on the fire risk (combined fuel load and ease of egress) of occupancies in relation to one another. Their purpose is to protect against the situation in which two occupancies having vastly different fire protection requirements are adjacent to one another and not suitably separated. For this reason, certain occupancies of similar risk are permitted by the Table to have separations with a FRR of 0. Therefore, requiring a higher FRR based off construction type, as has been done in the case of EMTC, is arbitrary and not based in sound fire safety principles. With this proposal to allow EMTC across most major occupancies, it is therefore proposed that these be removed. The array of fire protection principles whose effectiveness has been demonstrated over decades in buildings of both combustible and noncombustible construction should be considered sufficiently safe to protect EMTC buildings and their occupants as well.

*Note: this proposed change was provided by the Joint Task Group – Harmonized Variations for Mass Timber*

Related Proposed Change(s):

PCF01, PCF02, PCF03, PCF04, PCF06

PROPOSED CHANGE

Table 3.1.3.1. – Major Occupancy Fire Separations(1) – Forming Part of Sentence 3.1.3.1.(1)

Major Occupancy

Minimum Fire-Resistance
Rating
of Fire Separation, h

Adjoining Major
Occupancy

A-1

A-2

A-3

A-4

B-1

B-2

B-3

C

D

E

F-1

F-2

F-3

A-1

1

1

1

2

2

2

1

1

2

(2)

2

1

A-2

1

1

1

2

2

2

1(3)

1(4)

2

(2)

2

1

A-3

1

1

1

2

2

2

1

1

2

(2)

2

1

A-4

1

1

1

2

2

2

1

1

2

(2)

2

1

B-1

2

2

2

2

2

2

2

2

2

(2)

2

2

B-2

2

2

2

2

2

1

2

2

2

(2)

2

2

B-3

2

2

2

2

2

1

1

2

2

(2)

2

2

C

1

1(3)

1

1

2

2

1

1

2(5)

(2)

2(6)

1(7)

D

1

1(4)

1

1

2

2

2

1

(8)

3

(8)

(8)

E

2

2

2

2

2

2

2

2(5)

(8)

3

F-1

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

3

3

2

2

F-2

2

2

2

2

2

2

2

2(6)

(8)

2

F-3

1

1

1

1

2

2

2

1(7)

(8)

2

Notes to Table 3.1.3.1.:

(1) Section 3.3. contains requirements for the separation of occupancies and tenancies that are in addition to the requirements for the separation of major occupancies.

(2) See Sentence 3.1.3.2.(1).

(3) Where the building or part thereof is constructed in accordance with Article 3.2.2.48. or 3.2.2.51. a fire separation with a 2 h fire-resistance rating is required between the Group C and Group A, Division 2 major occupancies.

(4) Where the building or part thereof is constructed in accordance with Article 3.2.2.57. or 3.2.2.60. a fire separation with a 2 h fire-resistance rating is required between the Group D and Group A, Division 2 major occupancies.

(5) See Sentence 3.1.3.1.(2).

(6) See Sentence 3.1.3.2.(2).

(7) Where the building or part thereof is constructed in accordance with Article 3.2.2.48. a fire separation with a 2 h fire-resistance rating is required between the Group C major occupancy and a storage garage.

(8) Where the building or part thereof is constructed in accordance with Article 3.2.2.57. a fire separation with a 1 h fire-resistance rating is required between Group D and Group E or Group F, Division 2 or 3 major occupancies.