I want to install a wood single piece crown molding. Given that my ceiling trusses only run one direction, I will have nothing to nail into on two of the 4 ceiling sides of my room. I dont want to glue a backer board to my ceiling. Dont want to glue anything to my walls in case I need to take crown molding down. Is it necessary for me to nail the crown molding to the ceiling as long as I am nailing the crown molding into the studs in the walls? thx
Yes you definitely need to nail your crown molding into the ceiling joists as well it will prevent the top edge that is attached to the ceiling from sagging over time. I've done trim carpentry for ever 20 years.