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Old 01-07-2013, 12:23 AM   #1
Join Date: Jan 2012
Location: Pittsburgh, Pennsylvania
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Crown Molding

Hello all,
I just put up all new drywall in my living room and I was thinking about using crown molding at the ceiling.

My question is that if I am using crown molding do I still need to mud and tape the ceiling/wall joint?

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Old 01-07-2013, 12:32 AM   #2
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Location: Hartfield VA
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Crown Molding

Yes to seal the envelope, other wise air will leak into the attic.
But you can get away with just one coat of mud.
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Old 01-07-2013, 12:35 AM   #3
Join Date: Jan 2012
Location: Pittsburgh, Pennsylvania
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Crown Molding

I appreciate the fast response and understand what you are saying but prior to hanging my drywall I added a 6 mil vapor barrier that came down about 6 inches onto the walls where I glued it to the top plates.

I will still proably add the mud and tape anyways, just curious if I had too.
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Old 01-07-2013, 05:03 AM   #4
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Crown Molding

Yes,you do---that single layer of tape and mud is called 'fire tape' and will slow down the advance of a fire into the plastic you used as a vapor barrier.
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