AVS Forum Special Member
Join Date: Jan 2001
Location: Spring Valley, NY USA
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I have a main beam of the house running through the HT - I'm building a soffit around it (1 side attached to ceiling, other to the wall - basically an "L" shape). I understand that a main component of the sound containment is creating an air vacuum ("no sound in space") - thus the walls are sealed all around- so the cavity inside is a vacuum filled with insulation.
I would think that I have to do the same for the soffit, however the soffit is open on top due to the beam.
Should I have my ceiling (which decoupled via whisper clips/hat channel) go all the way and touching/sealed to this main beam - however if I do that how do I attach the IB3 clips to the ceiling joists, since the ceiling would then be between the IB3 clip and the joist?