RC8's effectiveness has been well documented for years. The problem is, RC8 isn't available in many locales or is available only to licensed contractors. This led to numerous customers calling Auralex saying they couldn't obtain RC8. Not to worry....Auralex has ya covered! RC8 should be installed horizontally at the bottom and top of your wall, then every 2' or less in between. Up to (2) layers of 5/8" drywall may be hung on RC8. Comes in a handy 8' length that's UPS shippable.