Hi again,
Continuing from here
http://recforums.prosoundweb.com/index.php/t/27038/19870/ but being more focused on one issue at a time, I'm hoping for some feedback on my choices below.
Goal
- maximum soundproofing keeping sound from getting out. No concern with sound treatment yet.
Room
- 550 sq ft (pretty much square)
- 3rd floor office building
- existing floor carpet on wood
Current plan:
- pulling baseboard, fill/seal everything
- lay heavy poly so it comes up about 6" on the walls, all taped/sealed
Now I'm thinking 2 options, no idea if either is better by much or at all.
Option 1 - floating floor
- closed cell neoprine blocks (or whatever I can get), minimize contact with existing floor
- 2x4 floor frame
- fill cavities with rockwool (or whatever I can get)
- 2 layers 1/4" plywood with greenglue beteween, offsetting seams, screwed together
- top layer of either carpet or thin rubber/neoprine/foam (whatever I can find) likely not more than 1/2"
Option 2 - no frame/blocks
- basically the same as Option 1 but no neoprine blocks or 2x4 frame
I'm mostly unsure about
- would having any type of cavity be worth the cost?
- would filling the cavity with rockwool be more useful than empty air?
- is there a more effective combination of materials for the floor sandwich?
The floow will be built to as close to the wall as possible, but not touching. The gap would be sealed. I was thinking angled rubber glued/caulked down to the wall/floor at the seam.
I'm hoping to begin work this week and will be documenting with pictures.
Thanks for any help
Another article I found useful here
http://www.uhfmag.com/Issue63/soundproofing.html