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Discussion Starter · #1 · (Edited)
Building a small structure adjacent to the main house.

This source shows STC data for various wall types, but doesn't help me understand how effective it will be below 125 Hz.


I'm building a double walled structure, and plan on on inner wall of 3/4" OSB, green glue and 5/8" drywall.

For the main structure outer wall, I was planing on conventional stick walls with standard fiberglass insulation.

Since mass is a key to soundproofing bass (by lowering the resonance frequency of the wall) would a switch to cement block outer walls be substantially more effective to reduce bass transmitted to the main house, located a few feet away?

Another suggestion was filling a wall with sand, but I would be concerned with 1) moisture absorption and mold, and 2) sand leaking out.
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