Just realized the guy on the job next door was using a 4 foot level for taping. Said he learned it from his uncle who did commercial work in Chicago. | Drywall Installers - Rigidtalk
Used a 5 footer on a commercial lobby once. Totally changes how you see the wall. You catch dips and bows way faster than with a 4. Just watch your corners and inside angles, they can fool you.