You will likely get more ideas/opinions here, but on mine I did 24 OC below the soffit and used 5/8ths rock. Also ran the 2X4's flat across so as to maintain as much height as I could. My soffit is about 6 feet across, so I ran a 2X4 along on top of the cross pieces and a vertical 2X up to the joist above the duct work. I did pull ups on every one of them and nothing moved. I weigh 195lbs. The insulation looking material is Roxul safe-n-sound sound deadener.
Last edited by MikeKy55; 09-11-2011 at 09:29 AM.
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