On Fri, 10 Oct 2008 09:28:18 -0700 (PDT), bud--
wrote:
On Oct 9, 3:29 pm, dpb wrote:
Ron wrote:
Well, my previous home had ALL of the interior walls insulated, and it
was MUCH quieter than my current home that doesn't have ANY interior
walls insulated.
Again, it depends on what was actually done. As someone else noted,
it's mass and isolation that do sound deadening effectively, and a
simple fiberglass batt doesn't accomplish much of either.
That's not to say one can't do effective sound isolation, but it has to
be more than simply adding 3" pink glass in a tubafor wall to be of much
benefit. So, your builder apparently knew what were doing and took some
steps.
As noted earlier, that's what I presumed (perhaps erroneously, he's not
come back w/ a real clarification when asked that I've seen so far) OP
had as that's what I ran into most frequently.
I had remembered insulation was fairly effective, but apparently not.
Fibreglass insulation is medeocre at best for sound proofing, but rock
wool is quite effective (also known as mineral wool or spun slag)
http://www.saecollege.de/reference_m...TC%20Chart.htm
has €śsound transmission class€ť numbers for different wall
constructions. Insulation adds, but not a lot (like you said).
http://en.wikipedia.org/wiki/Sound_transmission_class
has more information on STC and says it is "roughly the decibel
reduction in noise a partition can provide".
A local university hospital used 5/8 rock on 3.5" metal studs with
insulation between patient rooms (might have been double 5/8 rock each
side). But they were real strict on penetrations. Electrical boxes had
to be in different stud partitions. Doors had seals on all 4 sides.
Cracks are a major flaw in isolation.
=====================
I agree with whoever said you want to fish between the insulation and
drywall, not thorough the insulation.
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