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I designed my house with 3 inches of foam sandwiched between 2 walls of AAC blocks - Can't hear anything from inside the house. In the video I included a clip of a delivery guy shouting over the gate - half the village heard him but I only knew he was there as I got a notification on my phone - he was too scared to press the bell
Taking the volume with which my wife and her family call each other, I think I'd need at least 6 inches of foam for peace and quiet in our house.