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Old 06-10-2010, 06:40 PM   #1
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Adding green glue and 5/8"


I live in a 1st floor condo and I have decided to add green glue and a layer of 5/8" drywall to the entire ceiling and 2 shared walls. How do I extend the a/c grilles down an extra 5/8" to accomodate the new finish height? Do they sell extensions of some sort or do I just attach the finish grille with longer screws. I know they have electrical box extensions for when I do the extra layer on the walls and the recessed lights are adjustable.
Secondly, one of the shared walls is only shared for 2/3 of the way down the wall and then I have a door that goes to the exterior. Obviously I'm only concerned about adding the extra layer on the 2/3 that is shared but I have to carry it all the way down around the door so it is even. If I do that,how is the door caseing going to work beacause I have just increased the thickness of the wall around the door. If I just reattach the caseing to the new layer the caseing will be sitting 5/8" off the jamb and will not look right. Thanks for any info guys.

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Old 06-11-2010, 08:31 AM   #2
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Adding green glue and 5/8"


The air vent question was addressed on another post, but your door will require field-built extension jambs. Usually clear Pine or Poplar is used. You rip stock wood down with a table saw to fill that 5/8" gap. Sand smooth and paint to match.

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Old 06-11-2010, 08:47 PM   #3
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Adding green glue and 5/8"


Ok thanks alot. So I guess i would drywall first then just fill in whatever gap is there 5/8" + or -. I just didnt know if there was something more complex than that. very simple thanks again.
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Old 06-14-2010, 11:11 AM   #4
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Adding green glue and 5/8"


Let us know how this works!
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Old 06-17-2010, 08:59 PM   #5
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Adding green glue and 5/8"


If it's an inswing door then the extension jamb will prevent the hinges from opening all the way. If you reinstall the whole jamb in 5/8" so the hinges work you could put the extension jambs on the outside - but then you should also extend the door sill.

I'd be tempted to end the drywall short of the door and finish the edge with a bullnose, trim or even a small drywall box as if you needed a chase there.
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Old 06-17-2010, 09:04 PM   #6
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Adding green glue and 5/8"


Good point about the jamb and hinges. Regarding the drywall, for sound isolation you ideally want to run the drywall to the jamb and seal it to the jamb with quality acoustical sealant.

The gap that is commonly left between the drywall and jamb (window or door) and drywall is a common flanking path. Meaning the sound sneaks through, even if covered by cosmetic trim molding.

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adding layer of drywall, door caseing, door jamb thickness, extra drywall and door, green glue


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