Author Topic: Soundproofing a Ceiling  (Read 3141 times)


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Soundproofing a Ceiling
« on: November 10, 2018, 01:05:45 PM »
I bought a condo. The broker apparently showed it only when the upstairs neighbors weren’t home. The condos excessive ceiling lighting is proving to be a nightmare. I hear muffled conversations if directly overhead and can pinpoint where the various people are at all times given footfalls.
I’m considering soundproofing. I’ve read up and know there are two types of sound. Simplistically, footfalls and airborne.
All the forums say spray foam doesn’t really work. The solution seems to be:
1.   Cut off the existing ceiling
2.   Seal any holes with something like Green Glue Acoustic Sealant
3.   Insert rockwool safe and sound (or similar) in the joists – this should handle the airborne noise
4.   Use some kind of resilient channel system (metal rods) to run perpendicular to the joists. Goal being to create separation from the joists and my ceiling drywall to stop footfall driven soundwaves from traveling through
5.   Put up new drywall potentially quietrock
I talked to a local soundproofer and they said it was probably a $40k job. I really had that spare $40k laying in the corner slated for something else! So…I watched some youtube videos. Steps 1, 2, 3, and 4 seems fairly DIY. I’m no contractor, but this seems doable. I imagine I could hire a laborer to hang drywall for well shy of 40k.
Even if it was DIY this isn’t cheap. Rockwool seems to be about $50ish for a 5 square foot panel. So for a 225 sq ft room, I’m going to spend $2250 in rockwool alone. Quietrock seems to be about $350 for this space while regular drywall is about $50. Green glue is $100ish for a case online. Lowes seems to have a resilient channel system that is pretty affordable ($50 for the room). I’ve also seen the clip systems. I’m not having a really easy time getting pricing online but let’s say its $500 to be conservative with a lot of clips.
So, without labor help to hang drywall, I’m talking around $3k for supplies for a room. Probably a few hundred more for saws, masks, etc for the demolition.
Sheesh, wish there was an easier solution. Regardless, some questions:
•   Anything missing from my calculations?
•   Is there an effective and more affordable rockwool alternative?
•   Does anyone have proof of how effective this actually is? Would be tragic to spend the money and do all this and have it not really work. I know proper install is a big part of success but that seems to come from making sure you screw drywall into the resilient channel not the joists.
•   How do I deal with vents? Does anyone sell vent extenders?
•   How about lights and fans?
•   Will vents convey the sound and defeat the purpose?
•   Rockwool can’t cover the little Xs between the joists, does that matter?
•   If I do this to say a bedroom but don’t do the attached bathroom, will the footfall noise from the bathroom just transfer to the bedroom? I’m hoping the resilient channel will stop the vibration when it enters the soundproofed room but don’t know. Guessing rockwool will kill the airborne.
Thank you

Randy S

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Re: Soundproofing a Ceiling
« Reply #1 on: November 13, 2018, 04:09:14 PM »
ok you have been doing a lot of good research, however there are a few things missing.

I need more information as to when it was built and where you are located.

and this ceiling project should only cost you about 3k max in material, if your willing to do the work yourself.

Give me  a call direct to discuss particulars and principles.

I look forward to hearing from you.

Randy S.