4" outside corner.
A carpenter would charge you a mint to install actual wood crown molding, but when it’s 8’ above your head, who can tell if it’s wood or not? Instead, this Easy Crown Molding needs just peel-and-stick installation—you don’t even need a tape measure! lightweight, 52” long, plastic molding pieces with 3M self-adhesive backs, . Just overlap the sections (or trim with scissors) and stick them on the ceiling. You’re done! Leave it white or paint to match décor.