What gauge is used for horizontal joint reinforcement?

• A. 16-18 gauge
• B. 8-11 gauge
• C. 12-14 gauge
• D. 6-8 gauge

Answer: (B)

Horizontal joint reinforcement uses steel bars placed in the mortar joints to tie adjacent masonry wythes together and resist lateral shear from wind, seismic forces, and temperature movements. The gauge indicates wire thickness, and thicker gauges (lower numbers) provide more tensile strength, while thinner gauges are easier to place but weaker. In everyday practice, 8 to 11 gauge is the standard range for joint reinforcement because it balances sufficient strength to prevent sliding and cracking with workable installation in typical bed joints. Using thinner gauges would not offer enough reinforcement for lateral loads, while much thicker gauges would be heavier, harder to install, and not necessary for standard walls. This range aligns with common manufactured products and installation practices.