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Old 25th June 2020
Here for the gear

Originally Posted by avare View Post
GFR is like alcohol content. It is same in a mickey or a fifth.

As materials are compressed to thickness, the material near the surface gets compressed more than in the middle. Because thinner material has less middle material, the fibrs are closer together and hence greater resistivity.
Thank you very much for your response! That's good then, if I understand you correctly, this means I could stack together multiple pieces of Earthwool to reach a desired thickness at a desired air flow resistivity.

I've attached some numbers I ran from this chart using the Earthwool, the green would be a Super Chunk corner trap situation at 30cm depth, and the blue would be my panels at the early reflection points, which won't be able to achieve quite as much low-end absorption.
Attached Thumbnails
Help understanding whether thickness of material affects GFR?-airflowresistivity_chart.jpg