# R606.12.3.2 Minimum Reinforcement Requirements for Masonry Walls

Masonry walls other than those covered by Section R606.12.2.2.3 shall be reinforced in both the vertical and horizontal direction. The sum of the cross-sectional area of horizontal and vertical reinforcement shall be not less than 0.002 times the gross cross-sectional area of the wall, and the minimum cross-sectional area in each direction shall be not less than 0.0007 times the gross cross-sectional area of the wall. Reinforcement shall be uniformly distributed. Table R606.12.3.2 shows the minimum reinforcing bar sizes required for varying thicknesses of masonry walls. The maximum spacing of reinforcement shall be 48 inches (1219 mm) provided that the walls are solid grouted and constructed of hollow open-end units, hollow units laid with full head joints or two wythes of solid units. The maximum spacing of reinforcement shall be 24 inches (610 mm) for all other masonry.

MINIMUM DISTRIBUTED WALL REINFORCEMENT FOR BUILDINGS ASSIGNED TO SEISMIC DESIGN CATEGORY D_{0} or D_{1}

NOMINAL WALL THICKNESS (inches) | MINIMUM SUM OF THE VERTICALAND HORIZONTAL REINFORCEMENT AREAS ^{a}(square inches per foot) | MINIMUM REINFORCEMENT ASDISTRIBUTED IN BOTH HORIZONTAL AND VERTICAL DIRECTIONS ^{b}(square inches per foot) | MINUMUM BAR SIZE FORREINFORCEMENT SPACED AT 48 INCHES |

6 | 0.135 | 0.047 | #4 |

8 | 0.183 | 0.064 | #5 |

10 | 0.231 | 0.081 | #6 |

12 | 0.279 | 0.098 | #6 |

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 square inch per foot = 2064 mm^{2}/m.

- Based on the minimum reinforcing ratio of 0.002 times the gross cross-sectional area of the wall.
- Based on the minimum reinforcing ratio each direction of 0.0007 times the gross cross-sectional area of the wall.