After a renovation, the last thing anyone wants is paper-thin walls that provide no barrier to sound at all. To ensure that this never happens to you, choose the correct thickness of drywall. Most inexperienced DIYers choose a 1/4 inch thickness, but 3/8 inch is a wiser choice that offers much better soundproofing. The same principle applies to subflooring. There, choose a 3/4-inch thickness for added strength.