Why Joint Layout Is Decided Before the Pattern
Every exterior slab needs control joints, which give concrete a planned place to crack instead of a random one. On plain flatwork the joints are simply spaced across the area. On a stamped surface they also have to land somewhere that doesn't cut through the middle of a pattern element in an obvious way.
That's why the pattern and the joint plan are drawn together before forming. Skipping the step doesn't remove the joints; it just means they end up in the worst possible place visually. Joint spacing is set from the slab dimensions and the conditions at your property, so it is decided per project rather than by a fixed rule.



