Use scarf joints on long walls.
Join crown molding middle wall.
Most crown comes in 16 foot lengths so unless you re trimming out a gymnasium a single piece can usually span each wall.
Known as splicing or a scarf joint this task is fairly simple with the right tools.
Mdf plinth 2 3 4 in x 4 1 2 in interior white mdf classic mid moulding block.
Join sections of crown on long walls using scarf joints.
Set your miter saw to 22 1 2 degrees and make scarf cuts with the molding upside down just as you did for other miter cuts.
On occasion you may find that you need to join 2 pieces in the middle of a wall.