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post #1 of 2 Old 08-22-2017, 10:50 PM - Thread Starter
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Question Help needed with basement build

Hello, I'm in need of some suggestions for my basement build. I have two walls that are concrete, and one open, and one that is drywall. I'm trying tp decided what insulation would work best for sound.

The room dimensions are 11' x 18' by 7' high to the bottom of the open joists.

Here is my proposed build plan:
- Sealing concrete with Radonseal or Redgard
- Adding a secondary moisture barrier
- Building in decoupled walls from the concrete wall with 2x4
- Using either Roxul Safe 'n Sound or some XPS (such as This board), or even potentially the ones with the foil backing for extra moisture barrier (just in case).
- Then finishing off with 5/8" drywall.
- For the wall with drywalled wall already, I was just going to add in the insulation.

For the ceiling I plan on doing a cleat system with either Roxul or XPS again, and some drywall hanging free between the joists.

I'm also going to have four in-ceiling speakers for eventual Atmos, and two in-wall 8" drivers for my surrounds.

My questions are:
1. Which insulation would be best, the Roxul, XPS, or something else? (I don't care about temp, just sound).
2. Is drywall going to be the best, or should I add anything beyond that?
3. How does that all sound for an overall build? Any suggestions or edits?

Budget-friendly is also helpful.


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post #2 of 2 Old 08-23-2017, 05:57 AM
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multiple vapor barriers can trap moisture which leads to mold. Depending on your climate/region you want one really good one. Picking a particular insulation is the least important aspect of building a room with sound isolation. You need to follow all four of the principles, Mass, Isolation, Dampening and Absorption. The articles at are a good start.
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