What is the appropriate root opening for open -root joints? 1/8^n to 1/4^14 (3.2 to 6.4 mm) 1/4^n to 1/2^n (6.4 to 12.7 mm) 1/16'' to 1/8'' 1.6 to 3.2 mm) 1/32'' to 1/16^n (0.8 to 1.6 mm)

The appropriate root opening for open-root joints is $1/16''$ to $1/8''$ (1.6 to 3.2 mm). This range is suitable for providing sufficient space for the root gap and ensuring proper joint stability and strength.