A condo unit was being rennovated and the flooring was being replaced. The condo HOA required an impact insulation class (IIC) of 65. The IIC is a rating that shows how well a floor, or other assembly, attenuates impact noise. The existing assembly was tested and rated at 35. Using computer modeling and floor samples, a subfloor composition was designed to meet the 65IIC requirement. The results were detailed in a report and presented to the client.