Room Acoustics Forum by Rives Audio

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Cellulose insulation

Posted by GCNewsom on February 5, 2006 at 15:19:40:
The other day at work I saw a stack of acoustic cieling panels waiting to be installed. Naturally I looked them over closely. The panels are a 2 piece design; a perforated metal holder (which becomes the visible "tile" when installed) and about an inch thick bat of cellulose fiber inside. The cellulose is soft and flexible, like a fiberglass bat, but denser. Now, when we use soft fiberglass for bass or full frequency absorbtion, we generally compress it to get higher density, so a ridiculous depth won't be required. The need for this compression, in my admittedly limited experience, is one of the trickier parts of building DIY treatments. Why not use cellulose insulation instead? It's very cheap, $6 for a bale (I think 40 square feet, 3 inches thick) at Home Depot. Has any inmate compared the acoustic performance of cellulose to soft fiberglass? My thought was to use it either on top of Armstrong semi rigid fiberglass ceiling panels, or in a cylindrical trap with a less dense layer on top for higher frequencies, like foam rubber. I know there are proven designs using fiberglass (and I've built a couple), but I'd like to avoid working with fiberglass next time.