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[BS] A303.1 General
For the purposes of this chapter, any of the following conditions shall be deemed a structural weakness:
  1. Sill plates or floor framing that are supported directly on the ground without a foundation system that conforms to the building code.
  2. A perimeter foundation system that is constructed only of wood posts supported on isolated pad footings.
  3. Perimeter foundation systems that are not continuous.
    Exceptions:
    1. Existing single-story exterior walls not exceeding 10 feet (3048 mm) in length, forming an extension of floor area beyond the line of an existing continuous perimeter foundation.
    2. Porches, storage rooms and similar spaces not containing fuel-burning appliances.
  4. A perimeter foundation system that is constructed of unreinforced masonry or stone.
  5. Sill plates that are not connected to the foundation or that are connected with less than what is required by the building code.
    Exception: Where approved by the code official, connections of a sill plate to the foundation made with other than sill bolts shall be accepted if the capacity of the connection is equivalent to that required by the building code.
  6. Cripple walls that are not braced in accordance with the requirements of Section A304.4 and Table A304.3.1, or cripple walls not braced with diagonal sheathing or wood structural panels in accordance with the building code.

Related Code Sections

A301.2 Guidelines for the Seismic Retrofit of Existing Buildings, Scope
The provisions of this chapter apply to residential buildings of light-frame wood construction containing one or more of the structural weaknesses ...