Appendices > Appendix A - Table of Horizontal Temperature and Shrinkage Reinforcing

Typical Horizontal Rebar Spacing for .0007 Ag Masonry and .002 Ag for concrete
Mat’l	Thick	#3	#4	#5	#6	#7
Concrete	6	9	17	18	18	¾
Concrete	7	8	14	18	18	¾
Concrete	8	7	12	18	18	¾
Concrete	9	6	11	17	18	¾
Concrete	10	5.5	10	15	18	¾
Concrete*	12	9	17	18	18	¾
Concrete*	14	8	14	18	18	¾
Concrete*	16	7	12	18	18	¾
CMU	6	24	48	48	48	¾
CMU	8	16	32	48	48	¾
CMU	10	16	24	32	48	¾
CMU	12	12	24	32	48	¾
CMU	16	8	16	24	40	48

*	ACI 318-14 Section 11.7.2.3 requires two layers in walls over 10” thick, but “basement walls” are exempted, which presumably applies to retaining walls also. However, the above spacings assume that the specified rebar will be placed on each face.