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OBC 2006 › Division B

11.4.3.

Version 0 — in force 31 December 2006

In force
Verified · covered Verified against the 2006-12-31–2007-04-01 consolidation, whose range covers the query date. How to read this

Provenance

OBC 1997 · continues from 11.4.3. — Pro

Base · O. Reg. 350/06 · ext← current

Original — base regulation

OBC 2012 · continues as 11.4.3. — Pro

11.4.3. — Compensating Construction

Content not available for this version.

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.

Text · e-Laws consolidated snapshot

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.

Text · e-Laws consolidated snapshot

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.

Text · e-Laws consolidated snapshot

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

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

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.

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.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.

Text · e-Laws consolidated snapshot

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.

Text · e-Laws consolidated snapshot