Profile: Water Crest Condominiums (Madison, WI), QQ Step Soft 3mm, Quiet Qurl, RC Assurance Clips, Space Assurance.
Space Assurance™ is a flexible, flame resistant polyester fabric used as a fastener line, assuring the proper detail between the wall & ceiling.
RC Assurance™ is a steel clip designed to aide installation of resilient channels. The product acts as an impenetrable washer between the channel and the joist.
Check out Article from Thorburn Associates, Acoustic and Technology Consultants Resilient Channels - How metal absorbs sounds waves.
Ceiling isolation is as important to noise control as the floor isolation system. However, the bottom side remains a weak link. Acousticians and architects design ceiling systems properly but many
I came across this Article on HowStuffWorks.com It had a lot of interesting noise problems and solutions.