John Sayers' Recording Studio Design Forum Archive

Will you get better sound absorption stacking two different material types of sound insulation like, fibreglass batts and rockwool batts, to make a panel? Is it ok also to have no gaps between the fibreglass and the rockwool, just have it on top of each other?
Anyone tried this and what results did you come up with?

To the experts, I am thinking of making a panel like this:
9mm MDF back support -> 90mm rockwool -> 50mm airgap -> thin sheet of plywood or ivory cane-ite or mineral wood (used to make pin boards) --> 50 or 100mm fibreglass -> polyester batting (maybe to hold the fibres) -> 10mm airgap -> 5-9mm perforated or pegboard melamine sheet -> cloth to cover the panel (maybe)

Will this work as a bass absorbent panel? What frequencies do you think I'l get? What would I need to modify this design to make it work well.

Also, I am making a bass trap, as stated on my other post. Im worried that the fibreglass inside will start to whither away or fall apart into the center part due to all the vibrating, expanding pressure, etc, since all that is keeping it together is the metal frame with holes. Will this happen?

All these panels with fibreglass or rockwool in there, will they start to become dust through time, through all the vibration or waves it's absorbing, if their not held firmly together by chicken wire or cloth or wooden back support? I mean you open it up in 5 years time and its' all on the bottom of your panels, like powder or fibre powder.


Ta

Odeo, can you please edit your profile to include a location? If we know where you're from it's easier to know what to recommend for materials, etc - thanks...

Will you get better sound absorption stacking two different material types of sound insulation like, fibreglass batts and rockwool batts, to make a panel? Is it ok also to have no gaps between the fibreglass and the rockwool, just have it on top of each other? Anyone tried this and what results did you come up with?

To the experts, I am thinking of making a panel like this:
9mm MDF back support -> 90mm rockwool -> 50mm airgap -> thin sheet of plywood or ivory cane-ite or mineral wood (used to make pin boards) --> 50 or 100mm fibreglass -> polyester batting (maybe to hold the fibres) -> 10mm airgap -> 5-9mm perforated or pegboard melamine sheet -> cloth to cover the panel (maybe)

Will this work as a bass absorbent panel? What frequencies do you think I'l get? What would I need to modify this design to make it work well.

Also, I am making a bass trap, as stated on my other post. Im worried that the fibreglass inside will start to whither away or fall apart into the center part due to all the vibrating, expanding pressure, etc, since all that is keeping it together is the metal frame with holes. Will this happen?

No - the human ear is so sensitive that "normal" sound levels have almost no energy level at all, relative to, say, a bulldozer; in nearly 45 years of constructing things I've yet to see anything like what you ask about.

All these panels with fibreglass or rockwool in there, will they start to become dust through time, through all the vibration or waves it's absorbing, if their not held firmly together by chicken wire or cloth or wooden back support? I mean you open it up in 5 years time and its' all on the bottom of your panels, like powder or fibre powder.

No; again, I've never seen anything like this for fiberglass or mineral wools - some early foam board insulation, yes; since then formulations have been changed, and the materials available now don't have such problems when used for the applications they are intended.

Your other questions can't be answered until we know what your needs are; you didn't explain what you're trying to absorb, where it goes, etc -

After you edit your profile to include at least a country in the location field, maybe you could explain more what you're trying to do, in what type room, and possibly a sketch of some kind? Thanks... Steve