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403.1.1.1 Add the following section:
403.1.1.1 Stairways. For stairway replacement, see San Francisco Building Code Section 1011.12.3.
(Added by Ord. 65-19, File No. 190136, App. 4/12/2019, Eff. 5/13/2019)
403.13 Add the following section:
403.13 Substantial change.
403.13.1 Non-structural alterations. Whenever altera- tion work in a building or structure involves substantial changes to elements such as walls, partitions or ceilings, on 2/3 or more of the number of stories excluding basements, the building or structure as a whole shall comply with Section 301.2. The term “substantial change” in- cludes the addition, removal, repair or modification of such elements. All such work included in alteration permits issued within two years of the date of a permit application shall be included in the determination of whether the application is proposing substantial change to the building or structure.
Removal and replacement of interior gypboard or plaster in Type V (wood framed) R3 occupancy (one or two residential units) is not to be considered as “Substantial Change”.
The replacement gypboard must be 5/8" Type X with 5d cooler nails @ 4 inches on center or equivalent screws.
403.13.2 Structural alterations. When more than 30 percent of the floor and roof areas of the building or structure have been or are proposed to be involved in substantial structural alteration, the building or structure shall comply with Section 301. The areas to be counted towards the 30 percent shall be those areas tributary to the vertical load carrying components (joists, beams, columns, walls and other structural components) that have been or will be removed, added or altered, as well as areas such as mezzanines, penthouses, roof structures and infilled courts and shafts.
EXCEPTIONS:
1. When such alterations involve only the lowest story of a wood frame building or structure and Section 407 does not apply, only the lateral force resisting components in and below that story need comply with Section 301.2, or
2. When such alterations involve the lowest story of a Type V building or structure of R3 occupancy and that floor’s proposed use is as a garage, that level is exempt from Section 403.12.2. Such alterations need not be counted as part of the cumulative total of tributary area of structural alterations.
(Amended by Ord. 65-19, File No. 190136, App. 4/12/2019, Eff. 5/13/2019)
403.14 Add the following section:
403.14 Mandatory Seismic Retrofit. Submittal docu- ments shall include plans indicating locations and con- struction of existing, new and modified building elements used to comply with Chapter 4B.
(Amended by Ord. 65-19, File No. 190136, App. 4/12/2019, Eff. 5/13/2019)