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you need to toenail screw into joist from below. Use the right size screws.

Randy S.
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Is the basement poured concrete or cinder block?
if so the ceiling is where you need to focus most of your effort, if not I promise your walls will have little effect on what your neighbors hear.

I have done this mistake before, look at it like shaking a soda can up and popping the top..all the sound will go up and since that will be the area of least resistance they will hear your noise.

decoupling and mass will be the primary factors on this build.
speed of sound through air is 1129 fps but through wood framing is 13,000 fps

Why dont you give me a call direct and we can discuss.

Best Regards,

Randy S.
760-752-3030
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 I live in a condo with neighbors above me who have carpeting and underlayment but I still continue to hear loud squeaking noise when they step on certain parts of the subfloor making me think the subfloor has separated from the joists. Unfortunately there is no way for me to easily secure the subfloor back to the joist from their side because there is a layer of soft concrete above the plywood subfloor. Is there a way from my side above my ceiling drywall to minimize this effect my pulling and securing the subfloor to the joist from beneath. Something that would minimize the up and down effect from compression from foot fall?
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Hey all! First post here. I'm sorry if I'm not adhering to any rules I may have missed.

I'm looking at DIY'ing (inexpensively) soundproofing for a condo basement in Canada. I'm familiar with the basic concepts of soundproofing (mass=blocker, resonance is bad, viscoelasticity, etc), but need advice here.

Basically, I have adjoined neighbors to the east and west. I'm planning on making the basement a theater room (on a budget, since we both work part-time to support ourselves in volunteer work) soundproofing the basement walls against my neighbors to at least provide some level of sound dampening. Not the ceiling, since I won't be able to get access up there without major renovations, and I'm hoping the fact it'd need to travel through additional walls (the ceiling, floor, and then neighboring walls) will help avoid the need to touch the ceiling. The east wall is a straight 8' by about 10-12' stretch. Along the west wall has my mechanical room - this is basically a room within the basement, and this allows me currently to access the inside of that wall to insulate. I can also add drywall to the walls INSIDE the mechanical room since there isn't any as of yet. Total stretch would be about 14'-16', excluding the mechanical room?

Basically, I'm down to 3 options. I'm looking for best "bang for your buck". I'd like to watch Interstellar, for example, at reasonable volumes with a proper soundsetup without worrying about my elderly neighbors in their upstairs bedroom. I want to mitigate as best as I can.

1. Tear down the east wall, add insulation (planning to use Rockwool), and replace with new drywall. Instead of 1/2 drywall ($12/sheet) or "soundproofing" drywall with a viscoelastic layer ($60/sheet)", I'm planning to use 5/8 Type X (firecode) drywall ($17/sheet), which is 100lb a sheet vs 40lb a sheet for regular drywall. The drywall will be well over 1lb/ft. Then insulate the back of the west wall with Rockwool. Leave the west wall itself as is. Not sure if there's resilient channel?

2. Tear down both the east and west walls, add Rockwool, and replace both walls with Type X drywall.

3. Leave the existing walls and add a new layer of drywall to both the east and west sides, possibly with MLV in between (most expensive by far, $241/100sqft from a local supplier where I pickup, so probably $500+ just in MLV). I would have no idea how to do this, or what hardware to use for spacing the drywall.

I'm not familiar with "green glue" or any other specialty building products for sound reduction. My expertise is in auto sound reduction, which isn't really "expert" by any means. What's my best option here...?

The existing flooring is carpet, and I'm planning on redoing the floor with hardwood as well. So if adding another drywall layer is best, how should I do the flooring...? First? Doing the flooring first might be slightly problematic since we have a painter already working through the house, I'd like to get this done before he gets to the basement (within a couple of weeks), and this will be a job I'm working on almost entirely in my off-time (evenings).
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I really enjoy these basement builds, they make for great rooms. With that being said you have a great opportunity to do this right by avoiding some serious mistakes.
Yes your bricks in one of the stud walls is a great idea but you would have to seal them in with mortar for full effect.
For this build you will need mass loaded vinyl and some other products to make the ceiling system reach a high STC rating.
You also need to make sure the inner frame does not touch the ceiling assembly.

Give me a call direct and i will go over a few key tips so you avoid negating your efforts.

Randy S.
760-752-3030
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I'm building a basement music room. 3 walls are poured concrete. The 4th is going to be double stud walls with drywall, etc. I've read some things about wall "mass" and had a thought. I have about 1000 new bricks leftover from our house construction 2 years ago. Is there any value in stacking these inside one of the stud walls to increase sound attenuation? If so, is stacking sufficient, or would they need to be mortared in place. Thanks for the thoughts?
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Soundproofing Windows and Doors / Anderson Combination Unit (Storm) Windows
« Last post by Jericho75 on February 26, 2019, 06:30:17 PM »
Anyone have experiencing with the Anderson combination storm window units?

https://parts.andersenwindows.com/detail_1610237__w_dh_comb.html
"They are energy efficient and ideal for sound reduction for locations near airports, busy roadways, or other noisy environments"

On the description it states it help with sound but when i contacted them Anderson i couldn't get an answer on what the STS rating is or even the thickness of the glass.
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Soundproofing Windows and Doors / Re: Cost/Pricing issues
« Last post by Janhaus on February 19, 2019, 02:18:10 PM »
Another question on measuring: One of my windows has no sill, so I need to do a recessed mount. How much clearance compared to the actual window opening should I try to get a window for? An inch less width-wise and height-wise? Or even less than that?
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Soundproofing Windows and Doors / Re: Cost/Pricing issues
« Last post by Janhaus on February 19, 2019, 01:25:19 AM »
Got it ok no problem. Can a regular window sill support the weight? I'm told the 3/8 71x60 acrylic will be 67 lbs..
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Soundproofing Windows and Doors / Re: Cost/Pricing issues
« Last post by Randy S on February 18, 2019, 10:11:59 PM »
http://www.soundproofing.org/infopages/magnetseal_windows.htm

1 layer of 3/8" will work fine. hopefully you have 2" or greater sill depth.
Depending on your install, if you are going to rest the acrylic on the window sill then it would be 1" at the to and 2" additional inches for the width. you are basically using the L frame as corner framing, except at the bottom.

P.S. I am not in charge of the verification questions sorry.

Randy S.

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anything