i haven´t used anything till now. but since rooms are getting always smaller today i have to change my strategy sometimes.

people don´t always have space for 300 mm and up thick treatment.

so i have to experiment with different layers of more ridgid stuff if a just small space is available.

but there are countless types of rockwool available. and in different areas they are different priced. and they all differ in specs. so i am searching for a tool that can predict the performance of the material i have to use.