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In Seismic Design Categories Do, D, and D2 where a grouted masonry stem wall is supported on a concrete footing and stem wall, a minimum of one No. 4 bar shall be installed at not more than 4 feet (1219 mm) on center. The vertical bar shall extend to 3 inches (76 mm) clear of the bottom of the footing and have a standard hook. In Seismic Design Categories Do, D1 and D2, masonry stem walls without solid grout and vertical reinforcing are not permitted. Exception: In detached one- and two- family dwellings which are three stories or less in height and constructed with stud bearing walls, isolated plain concrete footings supporting columns or pedestals are permitted. 20.10.110 CRC Section R507.1 amended— Decks Section R507.1 is amended to read as follows: R507.1 Decks. Where supported by attachment to an exterior wall, decks shall be positively anchored to the primary structure and designed for both vertical and lateral loads as applicable. Such attachment shall not be accomplished by the use of toenails or nails subject to withdrawal. Where positive connection to the primary building structure cannot be verified during inspection, decks shall be self- supporting. For exterior balconies with cantilevered framing members, connections to exterior walls or other framing members, shall be designed and constructed to resist uplift resulting from the full live load specified in Table R301.5 acting on the cantilevered portion of the exterior balcony. 20.10.120 CRC Section R506.2.4 amended — Reinforcement support. Section R506.2.4 is amended to read as follows: R506.2.4 Reinforcement support. Where provided in slabs on ground, reinforcement shall be supported to remain in place from the center to upper one third of the slab for the duration of the concrete placement. As a minimum, and in all cases where a slab is to be placed inside of a building, the slab shall be reinforced with not less than six inches by six inches ten gauge welded wire mesh, or an approved alternate. In all slabs under habitable spaces, a minimum of 4 inches (102 mm) of crushed rock capillary water barrier shall be provided under a minimum 10 mil vapor retarder. The vapor barrier shall be protected by a minimum of 2 inches (51 mm) of sand or equivalent protection. 20.10.130 CRC Table R602.10.3(4) amended — Bracing Requirements based on Seismic Design Category.