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Old 26th April 2020
  #100
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I also was part of a team testing gg Et al in an independent lab. We worked very closely with the start up up through and well into the saint GoBain buy out.

Too many tests to count. Maybe over 7 years ??

Old data, to be sure. But it’s still valid.

If you’re in a free standing space and have the volume to use 3 or 4 layers of sheet material (5/8” rock) and you’re shooting for the lab style iso numbers then you don’t need gg. The added mass will be a better performing system.

BUT, if you live in the real world with limited space and want the biggest bang for your effort and $$...then use gg.