11.4. Performance Level Evaluation and Compensating Construction — OBC 2006 (in force 31 December 2006 to 1 January 2014)

11.4. — Performance Level Evaluation and Compensating Construction

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11.4.1. — General

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11.4.1.1. — Performance Level

(1) The performance level of a building after construction shall not be less than the performance level of the building prior to construction.

(2) For the purposes of Sentence (1), reduction of performance level shall be determined in accordance with Subsection 11.4.2.

(3) Where the proposed construction would reduce the performance level of an existing building, compensating construction shall be required in conformance with Subsection 11.4.3.

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11.4.2. — Reduction in Performance Level

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11.4.2.1. — Structural

(1) The performance level of an existing building is reduced where after proposed construction in all or part of an existing building,

(a) the major occupancy will change to a different major occupancy,

(b) the occupant load will increase by more than 15%, or

(c) the live load will increase due to change in use within the same major occupancy,

and the existing structural floor and roof framing systems and their supporting members after the construction are not adequate to support the proposed dead loads and live loads.

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11.4.2.2. — Increase in Occupant Load

(1) Except as required in Sentences 11.4.2.5.(2) and (3), the performance level of an existing building is reduced where proposed construction will increase the occupant load of an existing building by more than 15%.

(2) The performance level of an existing building is reduced where proposed construction will increase the occupant load by 15% or less and the new occupant load will be more than 15% above the occupant load for which a fire alarm system is required under Sentence 3.2.4.1.(2).

(3) The performance level of an existing building is reduced where proposed construction will increase the occupant load by 15% or less and the new occupant load will be more than 15% above the existing exit capacity as required under Article 3.4.3.4.

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11.4.2.3. — Change of Major Occupancy

(1) Except as required in Sentence 11.4.2.5.(4), the performance level of an existing building is reduced where proposed construction will result in,

(a) the change of the major occupancy of all or part of an existing building to another major occupancy of a greater hazard index,

(b) the conversion of a suite of a Group C major occupancy into more than one suite of Group C major occupancy,

(c) a suite or part of a suite of a Group A, Division 2 or a Group A, Division 4 major occupancy is converted to a gaming premises,

(d) the change of a farm building or part of a farm building to a major occupancy,

(e) the change of a building or part of a building is to a post-disaster building, or

(f) the change in use of a building or part of a building where the previous major occupancy of the building or part of the building cannot be determined.

(2) For the purpose of this Article and Sentences 11.4.2.1.(1) and 11.4.2.5.(4), the change of use set out in Clauses (1)(b) to (e) shall also be deemed to constitute a change in major occupancy.

(3) The performance level of an existing building is reduced where the early warning and evacuation systems requirements of other Parts for the proposed major occupancy exceed those of the existing building.

(4) The performance level of an existing building is reduced where the proposed major occupancy in the building is not separated from the adjoining major occupancies by fire separations having fire-resistance ratings conforming to Tables 3.1.3.1. and 11.4.3.4.B.v1

(5) The performance level of an existing building is reduced where the occupancy of all or part of an existing building of combustible construction is changed to a new major occupancy that would require the building, if it were a new building, to be constructed of noncombustible construction.

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11.4.2.4. — Plumbing

(1) The performance level of an existing building is reduced where the existing building is extended or subject to material alteration or repair, and plumbing in the existing building is adversely affected by the extension, alteration or repair.

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11.4.2.5. — Sewage Systems

(1) The performance level of an existing building is reduced where the existing building is extended or subject to material alteration or repair and a sewage system serving the existing building is adversely affected by the extension, alteration or repair of the existing building.

(2) Except as provided in Sentence (3), the performance level of an existing building is reduced where proposed construction will increase the occupant load of an existing building, and the new occupant load will result in the total daily design sanitary sewage flow of the building, calculated in accordance with Article 8.2.1.3., exceeding the capacity of any component of a sewage system serving the building.

(3) The performance level of an existing dwelling unit is reduced where proposed construction that,

(a) increases the number of bedrooms in the dwelling unit,

(b) exceeds 15% of the finished area of the dwelling unit, or

(c) adds new plumbing fixtures to the dwelling unit,

will result in the total daily design sanitary sewage flow of the dwelling unit, calculated in accordance with Article 8.2.1.3., exceeding the capacity of any component of a sewage system serving the dwelling unit.

(4) The performance level of an existing building is reduced where proposed construction will result in the change of a major occupancy of all or part of the existing building to another major occupancy and,

(a) the total daily design sanitary sewage flow of the proposed major occupancy, calculated in accordance with Article 8.2.1.3., exceeds the capacity of any component of a sewage system serving the building, or

(b) the type or amount of sanitary sewage which will, under the proposed major occupancy, be discharged to a sewage system serving the building, is prohibited by Article 8.1.3.1.v1

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11.4.3. — Compensating Construction

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11.4.3.1. — General

(1) Where the performance level of an existing building is reduced under Subsection 11.4.2., compensating construction shall be carried out in accordance with this Subsection.

(2) Except as provided in Sentence (3) compensating construction required under this Subsection applies to the part of the building being altered and shall include,

(a) fire separations, with the required fire-resistance ratings, separating the part being altered from the floor areas immediately above and below and from the immediate adjacent areas, and

(b) access to exits and exits from the building, where the alteration adversely affects the exit system of the building.

(3) Compensating construction required under this Subsection applies to the existing building systems that are adversely affected by the proposed construction.

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11.4.3.2. — Structural

(1) Where the performance level of an existing building is reduced under Sentence 11.4.2.1.(1),

(a) remedial measures shall be taken to support the proposed loads, or

(b) the portion of the floor affected by the proposed loads shall be restricted to the loading it will support and signs stating the restrictions shall be posted.

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11.4.3.3. — Increase in Occupant Load

(1) Where the performance level of an existing building is reduced under Sentences 11.4.2.2.(1)v1, (2) or (3) 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.

(2) Sentence (1) does not apply in a Group C occupancy where the new total occupant load is,

(a) 14 persons or fewer in a boarding, lodging or rooming house, except that where the occupant load is between 10 and 15 persons, an interconnected system of smoke alarms in corridors near stairways is required, or

(b) 16 persons or fewer in a building containing residential suites which are dwelling units, except that where the occupant load is between 10 and 17 persons, an interconnected system of smoke alarms in corridors near stairways is required.

(3) Where the performance level of an existing building is reduced under Sentence 11.4.2.2.(1)v1, additional construction shall be required in order that the building or part of the building subject to the increase in occupant load conforms to the requirements of Sentence 6.2.2.1.(2)v1, Subsection 3.7.4. and Article 9.31.1.1.

Editor's note

This map follows the as-filed text of O. Reg. 350/06 for Article 11.4.3.3. of Division B, in which Sentence (1) reads 'reduced under sentences 11.4.2.2.(1), (2) or (3) the building' — plural 'sentences' and no comma before 'the building'. The e-Laws consolidation editorially renders 'sentences' as the singular 'sentence' and inserts a comma after '(3)'; no amending regulation makes either change. This map preserves the as-filed wording.

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Table 11.4.3.3. For Evaluation and Upgrading of Early Warning/Evacuation Forming Part of Sentences 11.4.3.3.(1) and (2)

Col. 1	Column 2	Column 3
Notes	Early Warning and Evacuation, Evaluation and Upgrading	Part 11 Compliance Alternative ⁽¹⁾
⁽²⁾	Early Warning and Evacuation to be checked against (a) access to exit widths based on occupant load in Subsection 3.3.1. or 9.9.3.; (b) exit widths based on occupant load in Subsection 3.4.3. or 9.9.3.; (c) exit signs in Subsection 3.4.5. or 9.9.10; (d) lighting of exits, lighting of access to exits and emergency lighting in Subsection in Subsection 3.2.7. or 9.9.11.; (e) fire alarm system in Subsection 3.2.4. or 9.10.18.; (f) smoke alarms in Subsection 9.10.19.; (g) travel distance and number of exits in other Parts; and (h) door release hardware requirements in Articles 3.3.1.12. and 3.4.6.15., and deficiencies shall be upgraded.	EARLY WARNING (a) Compliance alternatives as listed may be used. EVACUATION (b) Compliance alternatives as listed to access to exit and exit widths, number of exits, door release hardware, and travel distance may be used.
⁽³⁾	Early Warning and Evacuation to be checked against (a) access to exit widths based on occupant load in Subsection 3.3.1. or 9.9.3.; (b) exit widths based on occupant load in Subsection 3.4.3. or 9.9.3.; (c) exit signs in Subsection 3.4.5. or 9.9.10; (d) lighting of exits, lighting of access to exits and emergency lighting in Subsection in Subsection 3.2.7. or 9.9.11.; (e) fire alarm system in Subsection 3.2.4. or 9.10.18.; (f) smoke alarms in Subsection 9.10.19.; (g) travel distance and number of exits in other Parts; (h) smoke control measures, and at least one elevator to permit transport of fire fighters to all floors in hotels whose floor level is more than 18 m high measured between grade and floor level of the top storey as per Subsection 3.2.6., and (i) door release hardware requirements in Articles 3.3.1.12. and 3.4.6.15., and deficiencies shall be upgraded.	EARLY WARNING (a) Compliance alternatives as listed may be used. EVACUATION (b) Compliance alternatives as listed to access to exit and exit widths, number of exits, door release hardware, and travel distance may be used.

Notes to Table 11.4.3.3.:

⁽¹⁾ See Table 11.5.1.1.A.v1, 11.5.1.1.B.v1, 11.5.1.1.C.v1, 11.5.1.1.D/E.v1 and 11.5.1.1.F.v1 for compliance alternatives that may be used.

⁽²⁾ Applies to change of major occupancy to one of equal or lesser hazard, and to increase in occupant load by 15% or less.

⁽³⁾ Applies to change of major occupancy to one of greater hazard, and to increase in occupant load greater than 15%.

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)v1, 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., Sections 3.7., 3.11., 3.12., Sentences 6.2.2.1.(2)v1, 6.2.3.9.(1)v1 and 6.2.4.7.(10), Articles 9.5.1.1. to 9.5.1.5, Articles 9.5.3.1. to 9.5.10.1, 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)v1, 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.v1

(4) Where the performance level of an existing building is reduced under Sentence 11.4.2.3.(4)v1, 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)v1 the requirement for noncombustible construction is satisfied if the building is sprinklered.

Editor's note

Table-11.4.3.4.A. — This map follows the as-filed text of O. Reg. 350/06 for the notes to Table 11.4.3.4.A. of Division B. The as-filed renders each note number — '(1)', '(2)', '(3)' — as a superscript followed by a space; the e-Laws consolidation renders the number in plain text with no following space (for example, '(1) One' becomes '(1)One'). Neither change is made by any amending regulation, and the note text is unchanged. This map preserves the as-filed rendering. The divergence persists into the later versions of this Article.

Editor's note

Table-11.4.3.4.B. — This map follows the as-filed text of O. Reg. 350/06 for the heading row of Table 11.4.3.4.B. of Division B, in which the label 'Part 11' is set directly against the italicized 'Compliance Alternative' with no separating space. The e-Laws consolidation renders the heading with a space ('Part 11 Compliance Alternative') throughout this edition; this is a presentational difference made by no amending regulation. This map preserves the as-filed text. The divergence persists across the versions of this Article.

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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.v1 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.v1 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.v1 ratings for C.I. of 4	Provide sprinklers in locations where assemblies do not comply with Table 11.2.1.1.A.v1	Combustible to Combustible. Noncombustible to Noncombustible.
H.I.5	C.I. 4 to 5	Comply with Table 11.2.1.1.A.v1 ratings for C.I. of 5	Provide sprinklers in locations where assemblies do not comply with Table 11.2.1.1.A.v1
H.I.5	C.I. (1, 2 or 3) to 5	Comply with Table 11.2.1.1.A.v1 ratings for C.I. of 5	Provide sprinklers in locations where assemblies do not comply with Table 11.2.1.1.A.v1	Combustible to Combustible. Noncombustible to Noncombustible.
H.I.6	C.I. 5 (Non- combustible) to 6	Comply with Table 11.2.1.1.A.v1 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.v1 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.v1 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.v1 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.v1 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.v1 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.v1 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.

11.4.3.5. — Plumbing

(1) Where the performance level of an existing building is reduced under Sentence 11.4.2.4.(1), upgrading of plumbing in the existing building which is adversely affected by the extension, alteration or repair shall be required in conformance with Part 7.

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11.4.3.6. — Sewage Systems

(1) Where the performance level of an existing building is reduced under Article 11.4.2.5., upgrading of a sewage system which is adversely affected by the construction, increase in occupant load, increase in the total daily design sanitary sewage flow or change in amount or type of sanitary sewage shall be required in conformance with Part 8.

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11.4.

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