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Old 06-10-2010, 07:42 PM   #1
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A/C grille extensions


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.

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Old 06-10-2010, 08:19 PM   #2
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A/C grille extensions


There aren't special extensions made for this, but you can make a sheet metal sleeve, raw on one end with 3/4" flange out on other end. Make the sleeve long enough to lap into the existing boot by about 1"and then pop-rivet or screw inside the boot. Then screw the register to the flange.

You should be able to make one yourself easy enough by using a short piece of duct bought from one of the DIY stores like HD, but if you have a sheet metal shop nearby they should be able to make them for you fairly quickly, provided you supply accurate measurements.

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Old 06-11-2010, 12:53 AM   #3
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A/C grille extensions


My educated guess is sound transmission?

Before you glue drywall on check out products like Z channel, http://soundproofing.org/infopages/channel.htm

Quiet rock http://www.quietrock.com/quietrock-d...FRabnAod7ERcXg

Do a google search, on sound transmission, noise complaints, Condo problems, sound deadening, etc. All the noise may not be coming through the walls and the glued on drywall may not completely solve the problem.

I believe Holmes on Holmes did a show on soundproofing a condo?? It would be worth doing a Google on that one!!
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Old 06-11-2010, 08:19 AM   #4
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A/C grille extensions


#1 If you aren't able to remove any existing drywall, then forget about z-channel, etc. Channels are great but need to be applied to the bare joist or stud.

#2 Pre-damped "soundproof" drywall will simply jack your cost up greatly. Stick to your plan as you've outlined.

#3 You won't need extenders, only longer screws, perhaps.

Take care that the sound you're looking to reduce isn't going to come in through the ducts...
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