Cheap Soundproofing layer on top of subfloor before carpet - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 18 Old 09-15-2019, 04:06 PM - Thread Starter
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Cheap Soundproofing layer on top of subfloor before carpet

I initially put this in the wrong section...

Anyway, We are starting to put together our HT (21'x16'x9') and I need some quick help. My wife is building the riser (yes she is the better carpenter) and I need some advice on what to put under it (and under the carpet for the rest of the room).

It is an OSB subfloor and has a room (kitchen) under it. Unfortunately I can't do anything with the space between the floor and the ceiling underneath. But I can lay down something on the subfloor before building the riser on it, and before carpeting the rest of the room (and the riser). But I can't spend very much - I have about 360 sq ft to cover and couldn't spend more than a couple hundred dollars. Is there something you recommend that I can put down or roll out before building the riser and putting down the carpet that will at least help deaden some of the sound? I do plan to shove a bunch of insulation into the riser.

If nothing else I was thinking this. https://www.amazon.com/UltraSeal-Und...ct_top?ie=UTF8 or this https://www.amazon.com/Roberts-70-19...SIN=B008N6Q7HI

I appreciate the help.
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post #2 of 18 Old 09-15-2019, 04:19 PM
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post #3 of 18 Old 09-15-2019, 05:05 PM - Thread Starter
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Originally Posted by BIGmouthinDC View Post
Those look great but unfortunately out of my price range right now. Seems I would need about 15 of them = $675. I know, small price to pay for the long term benefit but I've got other factors to contend with (WAF).
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post #4 of 18 Old 09-15-2019, 05:31 PM
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keep your eyes open locally for a gym that is going out of business and selling their rubber floor mats

For the riser, you could just cut strips for under the framing and you really only need enough for the perimeter if you build it right.

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post #5 of 18 Old 09-15-2019, 06:30 PM - Thread Starter
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Originally Posted by BIGmouthinDC View Post
For the riser, you could just cut strips for under the framing and you really only need enough for the perimeter if you build it right.
Good idea, thank you. So those rubber mats are much better than the rolls I linked?

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post #6 of 18 Old 09-15-2019, 09:15 PM
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can you stay warmer in a parka compared to a T-shirt?
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post #7 of 18 Old 09-16-2019, 02:04 AM
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Searching "horse stall mat" on my local Craigslist page turned up the following link. Not sure how it would work for your purpose, but for someone on a tight budget it might be worth considering (if you can get it locally or shipping isn't too expensive).
https://atlanta.craigslist.org/atl/g...971762049.html

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post #8 of 18 Old 09-16-2019, 06:40 AM - Thread Starter
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Thanks for the link, I'll take a look through that.

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post #9 of 18 Old 09-16-2019, 06:49 AM
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I suspect that the conveyor belts are harder less resilient. Not as desirable but they do have mass which is good.
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post #10 of 18 Old 09-16-2019, 07:09 AM - Thread Starter
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Good tip on the gym. I found one going out of business. They only have seven left though. And still more than I want to pay ($25 each). Decisions.

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post #11 of 18 Old 09-16-2019, 08:12 AM - Thread Starter
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Well I decided to get those mats for under the riser. For the rest hopefully I can find some more for cheap or I'll have to get them at tractor supply. Either way I'm going to be in trouble for weeks.
To save a little money do you think I should still cut strips for under the riser? Or will the lack of mass there be noticeable?

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post #12 of 18 Old 09-16-2019, 12:03 PM - Thread Starter
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Nevermind, I recalculated and I only need 10 panels. So after these 7, I just need 3 for the whole floor. I'll just fill the whole space. Thanks for the help.

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post #13 of 18 Old 09-20-2019, 06:31 AM - Thread Starter
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Quote:
Originally Posted by BIGmouthinDC View Post
I am going to start laying down these heavy horse mats. Is there anything I should put between the osb subfloor and the horse mats? I found some green glue at a good price on Craigslist. Would it be at all effective between the osb and horse mats?

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post #14 of 18 Old 09-20-2019, 08:44 AM
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The gg will not provide any benefit, a carpet adhesive intended for rubber backed carpets would keep the mats from moving around.
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post #15 of 18 Old 09-20-2019, 09:38 AM
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Those mats are pretty heavy themselves and the riser will be heavy as well, so I doubt it will move anyways.
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post #16 of 18 Old 09-20-2019, 09:52 AM - Thread Starter
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So those mats have one side smooth and one textured. Do you think it will matter which size is up or down? It will be carpeted on top of them in the non-riser places.

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post #17 of 18 Old 09-20-2019, 06:03 PM
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Quote:
Originally Posted by qlizard View Post
I am going to start laying down these heavy horse mats. Is there anything I should put between the osb subfloor and the horse mats? I found some green glue at a good price on Craigslist. Would it be at all effective between the osb and horse mats?

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Originally Posted by BIGmouthinDC View Post
The gg will not provide any benefit, a carpet adhesive intended for rubber backed carpets would keep the mats from moving around.

Agreed with BIG, GG is for damping relatively rigid layers, using it with rubber would seem to either provide minimal or no benefit at all.


Roberts, which makes various glues, has very particular recommendations for attaching a rubber layer to OSB. I wrote up some feedback they shared here, but you may want to reach out to their customer service directly yourself. https://www.avsforum.com/forum/19-de...l#post58546412

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post #18 of 18 Old 09-20-2019, 07:20 PM
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I would place textured side down. Minimizes contact area.
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