Originally Posted by fumarate
Thanks Nick for your answer.
It was clear and easy to understand.
Based on your feedback I have researched some more.
It sounds like the air gap also helps to control the lower frequency sound better than just a single wall with clips and channel method?
The double stud wall construction with an air gap sounds like the best method.
I’m still debating if I will do the work myself or have someone else come in and do it.
I would like to save money and do it myself.
The single stud wall with clips and channels sounds a bit easier to do on your own. The double stud wall construction sounds like you will be building your own room within a room, a bit more of a challenge for a do it yourself project?
Please correct me, but the double stud wall construction then would be the following???:
Outside wall Drywall 5/8”
Standard Studs 24” OC + insulation R13? Or R19? in between
Air Gap 1 – 3”??
Inner wall Standard or Staggered?? Studs + insulation R13? Or R19? In between
Drywall 5/8” or OSB?
Is this correct?
See I was finishing my entire basement, so I bought myself a framing nailer. A bit pricey for a single room. I've used screws before (not as strong as nails) or the old nail/hammer method for smaller projects or before I had the framing nailer.
I would go 16" on center for studs. 24" is a "possibility" for exterior walls in *some* installs. General code/good practice is 16" OC. That is what people look for when trying to find studs inside a house once it is done. Plus the double layer drywall inside the theater will be heavy and you will want the structure..
If you insulate just the inside wall of the double wall, then you can go with a 1" gap. If you decide for some reason to insulate both sides, then I would go with a 3" gap. The air, like you said, will help with soundproofing. I know that in a staggered wall, you only insulate the inner wall so that there is an air gap of about 3.5" total.
So to maximize your space and keep costs down a touch, go with insulation on the inside wall only and have a 1" gap. I do NOT have any data to show what the different properties are for the inside and outside walls being insulated with the larger gap in the middle vs. a 1" gap and single (inner) wall being insulated. I would think that there would be some improvement, but not sure if it is enough to justify the insulation cost and additional 2" all around lost in sqft inside the room.
The studs can be lined up or staggered. It won't make a difference. If you use faced insulation (paper on one side which I read was a good idea) just staple it in place a little bit to hold it in the wall cavity that you want.
R19 insulation is designed for 5.5" thick (2x6 construction) walls. It won't work for what you want. The R13 will fit into the 2x4 wall cavity. I did use R19 above my ceiling, but again, different situation.
As for drywall vs. OSB for the first layer. 3/4" OSB *can* potentially resonate despite its thickness, but boy is it nice for screwing the drywall into as you will never "miss" with a drywall screw and I know that a number of people have used it in the past. I used it around my soffits and liked the properties mention about being able to put a drywall screw in anywhere I wanted.
Drywall is easier to cut (in my opinion), but also is less forgiving if it desides to "tear".
For more info on soundproofing with OBS/drywall you can read here:http://forum.studiotips.com/viewtopic.php?t=193
So here is a modified list from my perspective:Outside wall
Standard Studs 16” OC
Air Gap 1”Inner wall
Staggered Studs 16" OC + insulation R13 In between
Drywall 5/8” or OSB? (both have benefits/limitations)
Another tip to think about is using an acoustical sealer caulk on the edges/corners on the bottom layer of drywall/osb BEFORE putting up the GG and 2nd layer. I've heard of some success (dare I say it) with 50year silicone for a lot less cost. Probably not as much acoustical properties as the acoustical sealant, but significantly lower cost. Just be sure to get the 50 year pure silicone (clear stuff). It takes a little looking as most places stock 25year old, but I found mine at Lowes I think.