Can I joint the key joint at a 4 way or cross intersection?
Yes. At these intersections it is best to form the intersection using 4 separate pieces of key joint. To produce the strongest joint in the finished concrete the tongue of the key joint sections should all be facing in the same “circular” direction when viewed from on top of the joint. This also eliminates any need to trim or scribe any ends of the key joint sections to fit over the other sections.
