Section R404.1, Concrete and masonry foundation walls, of the IRC, is hereby amended by adding the following paragraph:
Section R404.1 Concrete and masonry foundation walls lateral support Prior to backfill in lieu of a poured in place floor slab to provide bottom lateral support, one of the following may be provided - (1) a full depth (minimum 1-1/2") nominal 2" x 4" keyway may be formed into the footings to secure the bottom of the foundation wall -or- (2) 36" long vertical # 4 rebar may be embedded a minimum of 6" into the footings not to exceed 7' o.c. spacing