Andrew Legge, CEO of Havelock Wool, a company that produces natural, sustainable building insulation made from wool, explains that a thin wall has a maximum thickness of 4.5 inches.

Soundproof quality of a wall is rated by the Sound Transmission Class. You can hear normal speech through a wall with an STC of 25. At an STC of 42, loud speech is audible as only a murmur. A well ...

Building this sound wall should not be too costly, especially if you do it yourself. You'll need 2-by-4 framing lumber, insulation made especially for sound attenuation, a few pieces of Sheetrock ...

One source of sound leakage is the void between the curtain wall and the interior wall partitions. "It's important to tightly seal the partition to the curtain wall, usually to the mullion," says ...