Section 506A

CHANGE OF OCCUPANCY 506 A .1 Conformance. No change shall be made in the use or occupancy of any building, that would place the building in a different division of the same group of occupancy or in a different group of occupancies, unless such building is made to comply with the requirements of the California Building Code for the use or occupancy. Subject to the approval of the building official, the use or occupancy of existing buildings shall be permitted to be changed and the building is allowed to be occupied for purposes in other groups without conforming to all the requirements of the California Building Code for those groups, provided the new or proposed use is less hazardous, based on life and fire risk, than the existing use.

PRESCRIPTIVE COMPLIANCE METHOD

uated and designed for live loads approved prior to the alteration. If the approved live load is less than that required by California Building Code Section 1607A, the area designed for the nonconforming live load shall be posted with placards of approved design indicating the approved live load. Where the alteration does result in increased design live load, the live load required by Cali- fornia Building Code Section 1607A shall be used.

[BS] 503 A .4 Existing structural elements carrying lateral load. Except as permitted by Section 503A.13, where the alteration increases design lateral loads in accordance with California Building Code Section 1609A or 1613A, or where the alteration results in a prohibited structural irregularity as defined in the California Building Code, or where the alter- ation decreases the capacity of any existing lateral load-car- rying structural element, the structure of the altered building or structure shall be shown to meet the requirements of Cali- fornia Building Code Sections 1609A and 1613A.

Exceptions: For incidental and minor alterations:

1) Any existing lateral load-carrying structural ele- ment whose demand-capacity ratio with the alter- ation considered is no more than 10 percent greater than its demand-capacity ratio with the alteration ignored shall be permitted to remain unaltered. For purposes of calculating demand-capacity ratios, the demand shall consider applicable load combina- tions with design lateral loads or forces per Califor- nia Building Code Sections 1609A and 1613A. For purposes of this exception, comparisons of demand- capacity ratios and calculation of design lateral loads, forces, and capacities shall account for the cumulative effects of additions and alterations since original construction.

2) Drift limits based on original design code shall be permitted to be used in lieu of the drift limits required by ASCE 7.

[BS] 503 A .5 Seismic Design Category F. Not permitted by OSHPD.

[BS] 503 A .6 Bracing for unreinforced masonry parapets on reroofing. Not permitted by OSHPD.

[BS] 503 A .7 Anchorage for concrete and reinforced masonry walls. Not permitted by OSHPD.

[BS] 503 A .8 Anchorage for unreinforced masonry walls in major alterations. Not permitted by OSHPD.

[BS] 503 A .9 Bracing for unreinforced masonry parapets in major alterations. Not permitted by OSHPD.

[BS] 503 A .10 Anchorage of unreinforced masonry parti- tions in major alterations. Not permitted by OSHPD.

[BS] 503 A .11 Substantial structural alteration. Not permit- ted by OSHPD.

[BS] 503 A .12 Roof diaphragms resisting wind loads in high-wind regions. Not permitted by OSHPD.

[BS] 503 A .13 Voluntary seismic improvements. Alterations to existing structural elements or additions of new structural elements that are not otherwise required by this chapter and

106 2019 CALIFORNIA EXISTING BUILDING CODE

Copyright © 2019 ICC. ALL RIGHTS RESERVED. Accessed by Kevin Day (kevin.day@dgs.ca.gov), (California Building Standards Commission) Order Number #100735044 on Jul 24, 2019 03:54 PM (PDT) pursuant to License Agreement with ICC. No further reproduction or distribution authorized. Single user only, copying and networking prohibited. ANY UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT, AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.

100735044

PRESCRIPTIVE COMPLIANCE METHOD

Determined by the Secretary of the U.S. Department of Interior as contributing to the historical significance of a registered historic district or a district preliminarily determined to qualify as an historic district.
Designated as historic under a state or local historic preservation program that is approved by the Department of Interior.

[BS] 507 A .4 Structural. Historic buildings shall comply with the applicable structural provisions in this chapter.

Exceptions:

The code official shall be authorized to accept existing floors and existing live loads and to approve operational controls that limit the live load on any floor.
Repair of substantial structural damage is not required to comply with Sections 405A.2.3, and 405A.2.4. Substantial structural damage shall be repaired in accordance with Section 405 A .2.1.

506 A .1.1 Change in function. A change in function shall require compliance with all the functional requirements for new construction in the California Building Code, including requirements in California Building Code Sec- tion 1224.

Exception: Minimum room clearances, areas, and dimensions may meet the requirements of the 2001 Cal- ifornia Building Code for existing rooms re-used for a similar purpose, subject to the approval of OSHPD.

506 A .2 Certificate of occupancy. A certificate of occupancy shall be issued where it has been determined that the requirements for the new occupancy classification have been met.

506 A .3 Stairways. Existing stairways in an existing structure shall not be required to comply with the requirements of a new stairway as outlined in California Building Code Section 1009 where the existing space and construction will not allow a reduction in pitch or slope.

506 A .4 Structural. When a change of occupancy results in a structure being reclassified to a higher risk category, the structure shall conform to the seismic requirements for a new structure in the California Building Code of the higher risk category.

Exception: Specific seismic detailing requirements of Cal- ifornia Building Code Section 1613A for a new structure shall not be required to be met where it can be shown that the level of performance is equivalent to that of a new structure. A demonstration of equivalence shall consider the regularity, over strength, redundancy, and ductility of the structure.