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-   -   MLV - Under New Flooring (https://www.avsforum.com/forum/19-dedicated-theater-design-construction/3106616-mlv-under-new-flooring.html)

zoso124 12-02-2019 12:32 PM

MLV - Under New Flooring
 
I stumbled upon a Youtube video called "Sound Proofing Secret that Actually Works".

In it the Contractor states the secret is placing MLV between sub-flooring and carpeting/hardwood will reduce the sound coming from the above floor into the finished basement/home theater.

States this is much cheaper and easier than putting clips, hat channel, 2 sheets 5/8”drywall, and GG. If find this is hard to believe. I believe it can help with the sound coming into the theater but I’m skeptical it will do as much with the sound escaping from the theater. Thoughts?

BIGmouthinDC 12-02-2019 12:53 PM

snake oil, there is a LOT of bad advice on soundproofing that can be found on YouTube

zoso124 12-02-2019 06:46 PM

Quote:

Originally Posted by BIGmouthinDC (Post 58903244)
snake oil, there is a LOT of bad advice on soundproofing that can be found on YouTube

Thought so, we're planning on putting down LVP in the next year on the main floor above the future theater. Any recommendations on what to put down between it and the subfloor?

BIGmouthinDC 12-02-2019 07:18 PM

when I ripped up carpet and put down Hardwood above my finished theater I added a layer of 1/2 OSB with Green Glue I felt it made a difference. There are other resilient mats on the market that I think also make sense marketed for under hardwood/laminate floors.

niccolo 12-02-2019 07:58 PM

Quote:

Originally Posted by zoso124 (Post 58905186)
Thought so, we're planning on putting down LVP in the next year on the main floor above the future theater. Any recommendations on what to put down between it and the subfloor?


The usual soundproofing advice applies...add mass. The better isolated, the better. Damped, isolated mass, even better. And then deal with the gaps as best you can. For floors, extra layers of subfloor, floated over rubber layers if possible, and maybe with Green Glue between the layers, though my hunch--and that's all it is--is that rubber mats may be a better floor choice than Green Glue. And then caulk the seams. Of course, if you don't want to raise the floor, all of this is infeasible.

BIGmouthinDC 12-02-2019 08:12 PM

I agree, floating a new sub-floor on rubber mats would be my first choice today.

zoso124 12-02-2019 09:30 PM

Thanks guys! Appreciate the suggestions.

zoso124 12-07-2019 06:43 AM

Quote:

Originally Posted by BIGmouthinDC (Post 58905586)
I agree, floating a new sub-floor on rubber mats would be my first choice today.

I stumbled on these Acoustic Sleeper Pads, you put them down spaced out 24" OC then two layers of 7/16 OSB. I'm wondering how much give is between blocks. Meaning would the floor seem saggy.

https://isostore.com/stc-acoustic-sl...dproofing.html

BIGmouthinDC 12-07-2019 10:50 AM

there is also this: https://kineticsnoise.com/arch/rim.html
I think the bottom line is you may not need 100% coverage to decouple a subfloor, I imagine the choice of subfloor material will determine if it sags. 3/4 plywood does pretty good mounted on joists spaced 16 inches OC

Bigus 12-07-2019 01:39 PM

We had this discussion a while back. Taking a circular saw to some tractor supply horse stall mats and spacing out smaller squares of material would certainly save money. Whether it was better or worse is anyone's guess. I don't even have the software anymore to take a crack at that one. You lose mass, which is bad. But you lower spring rate and coupling area, which up to a point is good.

BIGmouthinDC 12-07-2019 01:47 PM

I've cut rubber mats and would grab a hook nose utility blade before a good circular saw, I would use the junker I have that I have used for scoring concrete in the past.

Bigus 12-07-2019 01:58 PM

I'll keep that in mind if I get brave enough to try it. Thanks.


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