In addition to the other requirements set forth in this subchapter, any building or structure, or portion thereof, used for the storage or handling of any grain or grain product or any food or food product for human or animal consumption, except dwellings or apartments, shall be ratproofed as follows:
(A) Ratproofing. Buildings shall be ratproofed in such a manner as may be prescribed in the Los Angeles County Health and Safety Code and/or the Uniform Building Code, as adopted by the city.
(B) Screening. All underfloor vents, openings in foundations, roof vents and skylights shall be screened by the use of screening of at least one-half inch mesh hardware cloth.
(C) Foundations.
(1) All foundations, except as otherwise provided in this subchapter, shall be continuous masonry foundations as specified for Type V buildings in the Uniform Building Code.
(2) Buildings erected without a continuous foundation and upon a slab of cement or asphaltic concrete not less than three inches in thickness need not be ratproofed as required if a concrete curb not less than one foot in depth below the natural ground grade is run continuously around and under the outside edges of such slab.
(3) Buildings under 400 square feet in area, having an 18-inch clearance under the floor joists and supported on piers, need not have the required continuous foundation.
(D) Walls. A 12-inch strip of non-corrodible metal lath, weighing not less than three-fourths pounds per square yard, shall be placed under wall coverings on the inside and outside of all exterior stud walls at the floor level; provided, however, such strip need not be placed on the outside face when there is maintained a clearance of 18 inches under the floor joists, or when the exterior wall covering is stucco. ('65 Code, § 6-2.606) (Ord. 492, passed - - ) Penalty, see § 10.99