Basic drywall installation ranges from $1-$2 per square foot. Adding soundproof drywall or accessories like Green Glue and resilient channels can increase the cost to $3-$5 per square foot.

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. It is typically ...