One wall of my family room has a soffit with a duct within it running the length of the room; another wall has a soffit with a duct about 1/5 the length of the room. The plan is to install crown along both, but I'm concerned that securing it only to the roof joists won't work, and I'm concerned about leakage if I start punching nailgun holes into the ducting itself.
Moving the ductwork is not an option.
One thing I'm pondering is to somehow secure a 1/2" thick wood frame around the soffit to provide a secure nailing surface, attaching it at the ceiling and to the studs beneath the soffit, but that's an ugly solution and I'm hoping for something smarter.
(Skipping the crown would be inconvenient, as I'm planning to use the crown to hide the speaker wire for the home theater setup.)
Thoughts or suggestions would be very much appreciated!
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