There are several sound isolation underlayment available for ceramic tile flooring.
One of them is this...
LATICRETE. 86 Latilevel.
It is important to have noise reduction especially for second floor installation.
I understand that there are ratings for noise reduction like Impact Noise Rating (INR), Sound Transmission Class (STC), Impact Insulation Class...
I understand, the higher the number, the better it is.
What is the Best Sound Isolation underlayment available for ceramic tile flooring?