San Francisco Building Inspection Commission Codes § 503.11 Substantial structural alteration

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work involves a substantial structural alteration, the lateral load-resisting system of the altered building shall satisfy the requirements of Sections 1609 of the [ ← ]

The arrow represents the location of language that has been deleted by San Francisco from the applicable California Code.

San Francisco Building Code and section 304.3.2 of this code. Where the building is assigned to Seismic Design Category D or F, supports and attachments for nonstructural components required to serve any portion of the building with a use included in Risk Category IV shall comply with Section 1613 of the [ ← ]

The arrow represents the location of language that has been deleted by San Francisco from the applicable California Code.

San Francisco Building Code or shall comply with ASCE 41 using an objective of Position Retention nonstructural performance with the BSE-1E earthquake hazard level.

Exceptions:

1. Buildings of Group R occupancy with not more than five dwelling or sleeping units used solely for residential purposes that are altered based on the conventional light-frame construction methods of the [ ← ]

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San Francisco Building Code. [ ← ]

The arrow represents the location of language that has been deleted by San Francisco from the applicable California Code.

2. Where the intended alteration involves structural components of the lowest story of a building and Section 506 does not apply, [ ← ]

The arrow represents the location of language that has been deleted by San Francisco from the applicable California Code.

the lateral load-resisting system above that story need not comply with this section.

SECTION 506 – CHANGE OF OCCUPANCY

506.5.3 Add the following sections:

506.5.3.1 Increase in Occupant Load. Where the occupant load of the entire building or structure is increased by more than 10 percent and by more than 100 persons as compared to the occupant load of the existing legal use or the use for which the building was originally permitted, the building shall comply with Section 304.3.2 for the reduced seismic criteria.

506.5.3.2 Group E. A building changing occupancy to an E occupancy, and is otherwise subject to Section 329, shall comply with Section 329.

Add the following sections:

SECTION 508 – MOVED STRUCTURES

508.1 Conformance. Structures moved into or within the jurisdiction shall comply with the provisions of the San Francisco Building Code for new structures.

508.2 Removal of Debris. Immediately after the building is moved and before it is occupied at the new site, the permittee must remove all debris and all walls and footings above grade at the site from which it has been moved, except where such walls provide support to adjacent buildings, structures or property. All excavated areas must be filled in or protected by substantial fences not less than 5 feet (1524 mm) in height. Add the following Chapter: