[Strawbale]Re: insulation against train vibrations
rene.dalmeijer at hetnet...
Thu Aug 19 02:49:22 CEST 2004
At 07:36 AM 8/19/04, you wrote:
>However, we're worried about the sound/vibrations that could reach us
>through the ground. When we listened with our ears to the ground we
>could hear a low rumbling and a high whining sound.
This type of foundation might help a little compared to a monolithic
concrete or brick foundation. I am sure though that you will still be able
to hear the low rumbling. An alternative not as green is to build on a
thick expanded styrofoam slab this will give a better contact sound
isolation. You could combine both techniques ie tires with thick foam
strips on top and then the framing for the walls and a wooden subfloor. For
good sound isolation the wood subfloor will requier extra mass in the form
of a thick layer of sand witha floating finish floor ontop of the sand. The
design and execution of this structure will have to be done carefully to
avoid local sagging of the building structure causing plaster cracks.
What you should seriously consider, although I am sure you have, are the
amount of times and time during the day when these trains pass. If they are
in the night time I personally don't think the site is a very good one as
you will experience sleep disturbance. SB walls are indeed a good sound
insulator but then again a normal SB wall will only give you about 55dBA
noise insulation. This is an average figure for the whole sound spectrum
lower frequencies will have a much lower performance of around 35dB and
much higher performance for higher frequencies.
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