I'm going to install crown molding in my family room and would like ideas on
the best way to attach the molding. Wall construction is drywall on 2x4
studs @ 16" o.c. and ceiling construction is drywall on trusses fabricated
from 2x4s and 24" o.c. Molding is MDF 5-1/4" standard crown molding.
In the past, I used a nail gun to shoot finish nails into the studs and
ceiling members. But where the trusses are parallel to the wall, there is
no nailing member at the top of the molding. Also, when I shoot nails near
the inside corners of the room, often the molding pulls in toward the wall
and the tight joints become loose.
One idea I have is to shoot nails into the studs at the bottom of the
molding and use construction adhesive along the top of the molding. Other
We always nail to the studs and to the trusses. On the side where you
have no nailing you can add a scab to the ceiling for your nailing.
Hold your crown up against a wall and see how much room you have
behind the molding. You can rip some material with a 45 on one edge
and nail it to the ceiling, toe-nailing into the top plate. Depending
on how much room you have behind the crown you may be able to nail the
scab against the wall instead of the ceiling. Your just trying to get
close enough so that your fastener will attach to the scab. Also
don't cut the scab where it will be tight behind the crown molding.
You want to leave enough room for some flexibility.
If you leave the end of the first piece loose you can dry fit the
either the second piece (cut long) or a piece of waste crown with the
correct cut. This will help to locate the proper position for the
first piece. Nail it tight before installing the next piece.
I guess this could work but I've never found it necessary.
On runs where there is no structure, I cut blocks to fit behind the crown.
The blocks are matched to the spring angle (38 deg) of the crown and are
glued with construction adhesive and tacked to the wall. This helps keep
the corners in the right position also. Good luck! --dave
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