Cork Underlayment Reducing Noise and Sound Transfer, Raise the Temperature in Your Home. Highest Acoustic Ratings https://www.youtube.com/watch?v=AzGSHllv5Qg&t=14s If you are looking for the ultimate in reducing noise and sound transfer between floors and, raise the temperature in your home look no further than our ½” = 12mm cork underlayment. This cork is a full half inch of loveliness. Cork helps protect your floor and subfloor from rot and degradation, so is prefect in new builds or condos. Cork is a natural insulator, so it can help keep your home warmer in winter and cooler in summer