Author Topic: Duplex: Soundproofing between floors, next steps?  (Read 6641 times)

afry316

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Duplex: Soundproofing between floors, next steps?
« on: April 14, 2018, 08:23:41 PM »
Hello -

This community is awesome. I have read numerous stories and learned a lot, my only regret is not finding this website sooner :-o

My story/request:

I have a duplex, which is split level and is of brick construction (exterior walls) and solid wooden joists. I live in the bottom portion and rent out the top. The entire upstairs is carpeted/padded except for the kitchen. The kitchen happens to be above my bedroom. In the past this was not a problem, but my new tenants work late (dont come home til 10-11) and then they are stomping around in the kitchen. I have talked to them about being quite and honestly I am not even sure if its them at this point or just the poor construction. Once I realized this problem I scrambled to fix it in several attempts.

Attempt 1: I cut holes at every joist and blew in insulation. This worked good for the airbone noises. I could not really hear anyone talking or any noise like that. However, I could still hear them walking around and dropping things.

Attempt 2: I found out about Green Glue and read that adding mass to the ceiling would lessen the vibrations. So, I added two layers of 5/8 drywall to the ceiling with green glue sandwiched in between. This helped a bit, but not a dramatic improvement. Airborne noises are virtually non existent, but the impact noises were still easily heard.

Attempt 3: I asked the tenants to let me know when they were going on vacation and I would do some improvements upstairs. The kitchen floor was porceline tile, which was on cement board that was screwed directly to the wooden subfloor - no underlayment. So what I did while there were gone was I installed a floating lament floor on top of the tile floor. I used a premium wool underlayment underneath the floating floor, which claimed high IIC numbers. This seemed to work well. It definitely dampened the impact noise but I can still hear it. Its not terrible, but I have become fixated on figure this out once and for all.

So that takes me to today. I am not sure where I should attack this problem from now. Should I installed a vinyl floor on top of the floating with a better underlayment? Should I throw in the towel on my bedroom ceiling and do a decoupled ceiling? Any suggestions on what would be the best approach?

Thanks for listening!

-Andrew


Randy S

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Re: Duplex: Soundproofing between floors, next steps?
« Reply #1 on: April 16, 2018, 06:30:19 PM »
Andrew,

In order to reduce impact noise you have to decouple somewhere.. either the ceiling below or the floor above..in the end as you can see decoupling is the only principle that provides the best perceived reduction of impact.

also remember if you decouple from the ceiling you could have some slight impact coming from the walls after the project is complete..normally in the field I find this to be minimum.

Randy S.
760-752-3030
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

afry316

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Re: Duplex: Soundproofing between floors, next steps?
« Reply #2 on: April 19, 2018, 03:41:18 PM »
Randy -

Thank you very much for your reply. I am quite familiar with your recommendations on how to decouple a ceiling as I have read quite a few of your posts. However, I have not found anything regarding your recommendation (process & products) for decoupling the floor. Would you mind either pointing me to a post or giving me a quick rundown on how to achieve floor decoupling.

Also, which do you think would be more effective in reducing impact noise - floor decouple or ceiling - if you HAD to choose.

Thank you sir!!

Randy S

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Re: Duplex: Soundproofing between floors, next steps?
« Reply #3 on: April 19, 2018, 03:51:55 PM »
Soundproofing at the source will always deliver the best reduction.

Flooring systems are normally reviewed in detail prior to system recommendations. The systems require enough space to raise the new floated floor anywhere from 1 1/8" to 2.5" lift before final flooring.
you can see some of the decouplers here on this page.
http://www.supersoundproofingsales.com/Flooring/products/27/

It would best just to reach me direct when you have some time to discuss the particulars that way the right system can be recommended.

Randy S.
760-752-3030
randy@soundproofing.org
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

kk0710

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Re: Duplex: Soundproofing between floors, next steps?
« Reply #4 on: March 31, 2019, 03:07:54 AM »
I hope you don't mind me bumping an old thread.  I have a similar situation except I haven't done anything yet since I want to do my research and keep the cost down.  I own a duplex and live down stairs, my house is old and the ceilings are lath and plaster. This is why removing them is just not an option.  New carpet upstairs so work from above isn't an option.  I have 10' ceilings so originally was thinking of building a secondary ceiling, nailing a ledger board to existing wall about an inch down and running new "joists." I wasn't sure how I would be able to get the wood into some of the rooms though.  Then I was thinking about taking some metal/wood studs or resilient channel right through the plaster to the existing joists, as this would be the least amount of work.  I like the new gap idea because then I can also add overhead power which several rooms desperately need,  add insulation with double 5/8th drywall, possibly with green glue.  It sounded good until I started reading that having a third leaf like that isn't the best option, one old post on here even said it would INCREASE sound and impact noise? Any thoughts?

Randy S

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Re: Duplex: Soundproofing between floors, next steps?
« Reply #5 on: April 01, 2019, 06:49:48 PM »
kk0710

For this type of project it would be best to contact me direct to discuss the particulars in depth due to possible effects and potential results for dealing with lath and plaster.

Best Regards,

Randy S.
760-752-3030
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

kk0710

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Re: Duplex: Soundproofing between floors, next steps?
« Reply #6 on: April 02, 2019, 03:30:08 AM »
I don't want to waste your time since this is a DIY thing ant not profitable to you. 

Randy S

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Re: Duplex: Soundproofing between floors, next steps?
« Reply #7 on: April 02, 2019, 02:52:01 PM »
kk0710
Helping people solve these problems successfully is not at all a waste of time and it could save you from making expensive mistakes.

I look forward to speaking with you.

Randy S.
760-752-3030
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

kk0710

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Re: Duplex: Soundproofing between floors, next steps?
« Reply #8 on: April 03, 2019, 01:59:27 AM »
Alright Randy, I appreciate that.  What is your time zone, and what are the best times to reach you? 

Randy S

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Re: Duplex: Soundproofing between floors, next steps?
« Reply #9 on: April 03, 2019, 02:44:12 PM »
Pacific Standard Time  8:00 am to 5:00 pm


Randy S.
760-752-3030
888-942-7723
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

 

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