As someone else commented, a lot of times extra layers of drywall are added to add mass to a wall (this is a fairly effective solution). But there are complicat

As someone else commented, a lot of times extra layers of drywall are added to add mass to a wall (this is a fairly effective solution). But there are complications to 'thickening' the wall like this (at least, if you want it to look professional in the end!). There's a great document from the US HUD on the topic: https://www.hud.gov/sites/documents/DOC_16419.PDF https://www.hud.gov/sites/documents/DOC_16419.PDF