Saturday, December 19, 1998 10:59:29 PM
From: GSBN@...,Txinfinet Incoming
Subject: Digest for 12/19/98
-> Re: Sound "Tests" SB Walls Longish
by Huff and Puff Constructions <huffnpuff@...>


Date: 19 Dec 1998 14:52:19 -0600
From: Huff and Puff Constructions <huffnpuff@...>
Subject: Re: Sound "Tests" SB Walls Longish

G'Day One and All

My you are all busy writing these days must be something to do with the
long dark nights. Obviously we are in mid summer and have to work for a
living. I have not been able to keep up with my normal email let alone
this list, some wonderful posts I only wish that I could put my two bobs
worth in.

We have just completed testing the sound qualities of "The Practice
Pad". The Practice Pad consists of three sound recording studios in
Surry Hills, an inner Sydney Office and Residential area, that we built
two years ago for Bruce Thomas. The Studio is located on the third
floor of a 6 storey office block. There are five straw bale walls 450
mm thick (18") which were sheeted in Gyprock 10mm on a 4x2 timber stud
wall. Each room has a double cavity door 450 mm deep no windows and a
wall mounted air conditioner.

The University of Technology Sydney kindly lent me the equipment to
measure the sound levels. We need these results for the College of
Sustainable Building (Straw Panel Factory) that we will build in 99 in
Ganmain in the middle of the village. The walls of the College will be
900mm (3') thick, the machinery in the factory (college) will consist of
a very large band saw run by an electric motor solar powered.

The tests on The Practice Pad was carried out by myself with a couple of
witnesses, no cheating was allowed. The instrument was a Radio Shack
Sound Level Monitor made in China under a Canadian licence, does that
make it Canadian? I used two weightings in the tests in the studio and
these were:

Weighting A curve frequency of 500-10,000 Hz range
" C " " " 200-18,000 " " I think need to
confirm the C However the C frequency is for musical instruments and the
A for humans I think.

Anyway the results are as follows: (It's 6,30 am Sunday morning and I
have to go roofing before it gets too hot and I am not awake yet. The
three studios were in full operation and three very loud bands were
using the studios at the time of the recordings:

Inside Studio 2 Background Noise Level A 55 db
(No Bands Playing) Air Con 61 db
C 54 db
Air Con 61 db
Outside Studio 2 Background Noise Level A 58-62 db
(No Bands Playing) C 63-68 db
Inside Studio 2, One Very Loud Band Playing A 105-107 db
C 114-117 db
Outside Studio 2, Three Very Loud Bands Playing A 62 db
(Meter 12" from walls) C 71 db
Outside Studio 2 Three Very Loud Bands Playing A 60-62 db
(Meter 10' from walls) C 67-68 db
Outside Studio 3 All Bands Playing A 65-66 db
(Meter under the air con) C 75-78 db
There was sound travel coming from the air con from Studio 3 from all
the other studios. (This a problem Bruce has to rectify.)
Outside the window Street Noise Levels A 68-71 db
C 68-70 db

Therefore it can be said that the straw bale walls are very effective in
reducing sound as if you all did not know that anyway. I just have not
been able to get any figures anywhere so here they are for what they are
worth. It was a very scientific testing conducted with meter in hand
and an ale in the other. (Only joking).

I also tested some other well known noise producers whilst I was in
Sydney. I used the A frequency.

Inside a house that I was staying in at Sydeneham Background 51 db
Jumbo Overhead 82 db
Jumbo Outside 104 db
It was intersteing to see how some Sydneysiders have to live!

On the M5 Freeway 104-109 db
On Parrammatta Road 83-102 db

Thanks for listening and I will write more later when I get off the
roof. We have started the Galston project and we set our profiles
between Christmas and New Year.

If anyone has some comments on these test results please let me know and
to all of you who have written to me in the last month I am sorry that I
have not replied but I will catch up over Christmas and New Year.

Salaams Straw Wolf


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