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sound isolaton numbers
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Thanks again for instructive and intelligent responses. Next 2
questions;
1) The auralex site alone lists 3 numbers which claim to represent how
effective a material is at stopping sound transmission
more. Which do I care about?
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For isolation purposes STC what's often looked at, but it's usually
considered for a whole assembly of materials (construction) rather than for
an individual material on its own.
Please tell me you're not planning on lining your walls with auralex and
expecting to spare your neighbours from the racket...
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Depends on what you are trying to achieve?
Absorbtion? Isolation? New construction?
Retrofit? Surface-only?
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Umm, I wish I knew what all those terms meant in reference to this
discussion. We are rebuilding a garage into a studio. We won't be
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If you are trying to reduce reflections inside the space (so it
doesn't sound like a bathroom or a hallway), absorption of
sound is likely what you are after.
If you are trying to reduce the amount of sound that goes
through the walls (in either/both directions), then isolation
is likely what you want.
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tearing down the whole thing, we will just be adding to the existing
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So likely isolation initially, and then maybe absorption
(or reflection?) to "tune" the sound of the space inside.
If you have a typical garage door, I would have low
expectations of decent isolation (in either direction)
unless you have a hefty budget. Good luck. Mass is
your friend. Lead sheets. Bales of hay. (Or perhaps
layers of sheetrock and/or that heavy vinyl sheet).
And even if you can build up the walls and seal up
the doors/windows, don't forget the roof.
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oh goodness no, we're rebuidling the whole thing as per a chapter in
Everest's book. The only point at which we're diverging from his plan
is wall connstruction, because we have mmore money.
This still doesn't answer question 1, BTW. As far as I could tell, all
these numbers referred to isolation.
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walls.
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Well, what do you want the treatment FOR? What's wrong with the existing
room that you want to fix? You need to keep outside noises from getting
in? You need to deal with excessive brightness or slap echos? You need
to deal with low end standing wave problems?
All of these acoustical treatments are specific devices to fix specific
problems. What problems do you have?
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2) To what extent does having mechanical connections between wall
elements render isolation methods ineffective?
In other words; is this
the same as, slightly worse, or much worse than having air between two
layers of drywall?
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It likely does better than nothing, but if it were better
than real double-stud construction, we would expect
them to prominently brag about such performance.
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Again, thanks to everybody in advance
Best regards,
Joseph Stavitsky,
Donovan Digital Recording
Fair Lawn, NJ, 07410
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