Basement Band Room Project Update Photos and Questions

[HokieMan]

I've gotten a lot of help from this message board and the guys at supersoundproofing on my project. I'm finishing a room in my basement that will be used as a rehearsal/recording space. My goal is to get the best soundproofing at a moderate price. My goal is that after I'm done my drumset will still be heard throughout the house but at a reasonable level, and barely noticeable from outside the house.

Anyways. I have pictures and would love some suggestions for the next steps.

What I've done so far:
- Roxul insulation in the walls, and R30 fiberglass insulation in the ceiling joists
- 2 Layers of black roofing felt stapled to the studs
- Double drywall and green glue on all the walls (1/2 inch, I was hanging it myself and 5/8 wasn't doable).
- RC2 channel on the ceiling and 5/8" drywall
- Ordered solid core doors

Next things to do:
- Caulking! - electrical boxes, lights
- Installing the doors and soundproofing all gaps
- HVAC vent soundproofing? - I have no idea how to do this
- Am I missing something?

This gives you a good idea of the wall structure http://db.tt/4OouWwrl
The room, looking at the stairway door http://db.tt/wUqkV2U9
Looking at the laundry room http://db.tt/RrOIIPXz
A closet area under the stairs. I guess there is some soundproofing to be done in here? Notice the drum set all packed away and dusty http://db.tt/EHubezL0
I had to use electrical box extenders because of the double drywall. Should I just caulk away at all any gaps? http://db.tt/9UjNvCUY
There are two holes in the drywall I had to make to have access to the main water shutoff valve. I'm not sure what the best way to soundproof this would be, other than stuffing in roxul
http://db.tt/z2xD3gdb

I'm looking for any help/suggestions, but also specifically how to address the electrical boxes, holes for water vales, and air vent. Thanks!

[Randy S]

HokieMan,

The next steps will be to seal this room like a fish tank with acoustical caulk.

There are a couple problems that I have noticed from your pictures...

The best way to deal with this is for you to call me.

Before you seal the room..

[whatismisophonia]

Why felt? we have a  layer of roofing felt between me and my brother's room, and he hears my tv over there louder than i hear it over in my room(pretty sure the felt isnt actually sealed up though).  If you were going to go with roofing, why not actual roll roofing as apposed to underlayment?  You must have realy been pressed for space.

[HokieMan]

The felt was my lame attempt at doing MLV.

I had read this article (almost a year ago) that said 2 layers of roofing felt was a poor man's 'equivalent' of MLV: http://www.drumdojo.com/j15/dojo2/tech/soundproofing/budget_mlv_soundproofing.htm

A few months ago was when I first talked to Randy- and it became clear to me that the felt won't really do much and doesn't come close to MLV.  It only put me out about $60 and I had already installed it- so I left it up.

Randy gave me a lot of good suggestions yesterday on the phone about addressing the air vents, electrical boxes, and gap at the bottom of the drywall. The conclusion we came to was that I should wait for the doors to arrive, install them, caulk everything, and give the room a test. Then address things one by one.

I'll probably be buying some foam mat to deal with water valves and metal pole:
http://www.supersoundproofingsales.com/Foam-Mat/products/17/

I'm also going to be needing some backer square to deal with big gaps:
http://www.supersoundproofingsales.com/Tapes/products/23/

I already had bought a box of acoustical caulking, but I'm guessing that I'll need another one before the job is done.

Also - he was a little freaked out by a leaning piece of drywall,   - But I explained how it is just a piece I haven't installed yet.

As always, Randy was very helpful while not being pushy to buy buy buy. I doubt this project would've turned out this well without his help.