Hello R. Reznick, first off, welcome to the forum, this is a great place to have questions answered, develop friendships, answer questions for others, and an information network to help you with issues. I believe that you possibly had some information miscommunicated to you regarding the joint design. I believe that both of these codes actually use the 22 1/2 degree a side bevel angle for an included angle of 45 degrees. Best regards, aevald