OBC 2006 › Division B

11.4.3.4.

Version 2 — in force 1 April 2010

In force · amended

Verified · covered Verified against the 2010-04-01–2010-06-30 consolidation, whose range covers the query date. How to read this

In force · amended

Verified · covered Verified against the 2010-04-01–2010-06-30 consolidation, whose range covers the query date. How to read this

Provenance

OBC 1997 · continues from 11.4.3.4. — Pro

Base · O. Reg. 350/06 · ext v0 →

O. Reg. 503/09, cl. 216 · ext v1 →

In force 2010-01-01

O. Reg. 205/08, cl. 13 · ext ← current

In force 2010-04-01

OBC 2012 · continues as 11.4.3.4. — Pro

11.4.3.4. — Change in Major Occupancy

(1) Where the performance level of an existing building is reduced under Sentence 11.4.2.3.(1)v2, additional upgrading shall be required in conformance with Table 11.4.3.4.A. and so that the construction index of the building is increased to at least equal the hazard index of the new major occupancy that the building is to support.

(2) A building or part of the building subject to change of major occupancy shall conform to the requirements of Subsection 3.2.6.v1, Sections 3.7., 3.11., 3.12., Sentences 6.2.2.1.(2), 6.2.3.9.(1) and 6.2.4.7.(10), Subsections 9.5.1. and 9.5.3. to 9.5.10., Section 9.7., Subsection 9.10.17., Sections 9.31. and 9.32., and Subsections 9.34.1. to 9.34.3. as they apply to the new major occupancy that the building or part of the building is to support.

(3) Where the performance level of an existing building is reduced under Sentence 11.4.2.3.(3)v2, the building shall be evaluated, and the early warning and evacuation systems shall be upgraded, in conformance with the applicable requirements of Table 11.4.3.3.

(4) Where the performance level of an existing building is reduced under Sentence 11.4.2.3.(4)v2, upgrading of those systems shall be required in conformance with the applicable requirements of Article 3.1.3.1. and Table 11.4.3.4.B.

(5) Where the performance level is reduced under Sentence 11.4.2.3.(5)v2 the requirement for noncombustible construction is satisfied if the building is sprinklered.

(6) Where the performance level is reduced under Sentence 11.4.2.3.(6)v2, the storey subject to the change shall be sprinklered.

Text · e-Laws consolidated snapshot

Table 11.4.3.4.A. Additional Upgrading Forming Part of Sentence 11.4.3.4.(1)

Column 1	Column 2	Column 3	Column 4	Column 5
New Major	Increase of C.I. to Equal	Additional	Part 11	Comments
Occupancy	H.I. to Support New	Required	Alternative
(H.I.) Number ⁽³⁾	Major Occupancy	Upgrading	Compliance
H.I.2	C.I. 1 to 2	Comply with Table 11.2.1.1.A. ratings for C.I. of 2	(a) Provide Early Warning system or
			(b) Comply with any A.C.’s in Col. 4.
H.I.3	C.I. (1 or 2) to 3	Comply with Table 11.2.1.1.A. ratings for C.I. of 3	(a) Provide Early Warning system or	Combustible to Combustible only.
			(b) Comply with any A.C.’s in Col. 4.
H.I.4	C.I. (1, 2 or 3) to 4	Comply with Table 11.2.1.1.A. ratings for C.I. of 4	Provide sprinklers in locations where assemblies do not comply with Table 11.2.1.1.A.	Combustible to Combustible. Noncombustible to Noncombustible.
H.I.5	C.I. 4 to 5	Comply with Table 11.2.1.1.A. ratings for C.I. of 5	Provide sprinklers in locations where assemblies do not comply with Table 11.2.1.1.A.
H.I.5	C.I. (1, 2 or 3) to 5	Comply with Table 11.2.1.1.A. ratings for C.I. of 5	Provide sprinklers in locations where assemblies do not comply with Table 11.2.1.1.A.	Combustible to Combustible. Noncombustible to Noncombustible.
H.I.6	C.I. 5 (Non- combustible) to 6	Comply with Table 11.2.1.1.A. ratings for C.I. of 6	(a) Provide sprinkler system, plus 45 min roof rating.
H.I.6	C.I. 5 (Heavy timber) to 6	Comply with A.C.	(b) Provide sprinkler system.
H.I.6	C.I. 5 (Combustible) to 6	Comply with A.C.	(c) Provide 1 h rating plus sprinkler system.
H.I.6	C.I. (3 or 4) to 6*	Comply with Table 11.2.1.1.A. ratings for C.I. of 6	(d) Provide sprinkler system, plus 45 min rating.	* For Noncombustible construction only.
H.I.6	C.I. (1, 2, 3 or 4) to 6**	Comply with A.C.	(e) Provide 1 h rating plus sprinkler system.	** For Combustible construction only.
H.I.7	C.I. 6 to 7	Comply with Table 11.2.1.1.A. ratings for C.I. of 7	(a) Provide sprinkler system.
H.I.7	C.I. (3, 4 or 5) to 7*	Comply with Table 11.2.1.1.A. ratings for C.I. of 7	(b) Provide 1 h rating plus sprinkler system.	* For Noncombustible construction only.
H.I.8	C.I. 7 to 8	Comply with Table 11.2.1.1.A. ratings for C.I. of 8	(a) Provide sprinkler system.
H.I.8	C.I. 6 to 8	Comply with Table 11.2.1.1.A. ratings for C.I. of 8	(b) Provide supervised sprinkler system.
H.I.8	C.I. (3, 4 or 5) to 8*	Comply with Table 11.2.1.1.A. ratings for C.I. of 8	(d) Provide sprinkler system, plus 1 h rating.	* For Noncombustible construction only.

Notes to Table 11.4.3.4.A.:

⁽¹⁾ One asterisk (*) refers to noncombustible construction.

⁽²⁾ Two asterisks (**) refers to combustible construction.

⁽³⁾ Group B, occupancy with any H.I. shall be sprinklered.

Table 11.4.3.4.B. (1) Additional Upgrading for Multiple Major Occupancies Forming Part of Sentences 11.4.2.3.(4) and 11.4.3.4.(4)

Column 1	Column 2	Column 3	Column 4
New Major Occupancy	Code Requirements	Part 11Compliance Alternative
All⁽²⁾	Table 3.1.3.1. and Subsection 9.10.9.	For Existing	If Sprinklered
		Building Reduce to	Reduce to
	Where:
	1 h rating required	45 min	30 min
	2 h rating required	1.5 h	1 h
	3 h rating required	2 h	1.5 h

Notes to Table 11.4.3.4.B.:

⁽¹⁾For buildings with multiple major occupancies only, where there is a change in major occupancy.

⁽²⁾See Section 11.4.