Owens Corning 703

Can you add a filler material? That would certainly dampen reflection and achieve your goal.

Pop,

Your designer is on the right track. However, what you describe results in an absorber, not a diffusor. And, it will be a pretty big one at that. Moreover, it will not likely work at very low frequencies since it is only 1" thick and it is placed against the floor above.

Generally, thicker material is required for bass trapping and it is best to space the material off the room surface.

Further, I'd begin to get a bit concerned about the room becoming too dead sounding....

I don't think you need worry about the fiberglass though.

If you read the Studio description on my website - there's some hints there. Also, feel free to give me a call if you need more help.

Larry

Larry,

Thanks for your response and your studio is beautiful - I have viewed it many times as a reference.

The "trap" above me is more for high frequency damping with regards to the 703 on the ceiling - I have several 1" by 5" boards between each joist at 30 degree angles - towards the front of the room which actually act as a diffuser. So I think it accomplishes both objectives - high frequency damping and diffusion.

I am building floor to ceiling bass traps in 4 corners of the room.

My contractor is concerned about the fiberglass, so now he has me thinking!

Thanks for posting your experience with your room - it must sound awesome.

Jerry

Some trap builders use a sheet of plastic or fine woven cloth over the fiberglass. That does affect the absorbancy to some degree but not sure how much. Then, there's the fire rating...

Is there a health concern? Didn't use to be about asbestos either. Now there are rising concerns about silica (cement). Maybe, breathing air causes cancer.