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GSBN: Digest for 4/28/06



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-> Living Houses - update
     by larskeller@...
-> GSBN:Re: fire test -- your opinions?
     by larskeller@...


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Date: 28 Apr 2006 04:40:15 -0600
From: larskeller@...
Subject: Living Houses - update

Dear everyone.

The research for inspiring houses for the online database of "living
houses" is progressing well.

Two weeks ago I submitted 16 new houses to the people who take care of
the database.
Included were houses from Finland, Australia, Bela Russia, Ireland,
Wales, England and Sweden.

The database has been moved to a new address, which - as far as I can
tell - is going to remain its home for the foreseeable future:
www.dr.dk/dr2/friland/levende+huse

Best regards
Lars Keller


~~~

Jo, Asger og jeg er pt I Australien. Vi er i Danmark igen til november.
Marts, april og maj maaned kan vi traeffes paa nedenstaende adresse og
tlf-numre.

Jo, Asger and I are in Australia until November this year. During
March, April and May our contacts are:

jomorandin@...
larskeller@...

Lars, Jo og Asger
Seli Hoo
31 Addison Road
Black Forest
Adelaide
SA 5035
Australien

Fast nettlf: 0061 8 8297 6249
Mobiltlf: 0061 405 366 455
~~~


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Date: 28 Apr 2006 08:50:20 -0600
From: larskeller@...
Subject: GSBN:Re: fire test -- your opinions?

If this test was to be performed in Denmark, Norway, or Sweeden I very
much doubt that we would consider using a plaster containing cement.
For two reasons:
1)  I cannot recall any SBC in either of these countries using
anything but clay or lime based plasters. So why begin now.
2) we can only fly as high as the dreams we dare to live, or smth
similar.... My point being, that IF a 2 hour earthen plastered wall
passes the test, that will impress and create possibilities for years
to come all over the place.

Experiences from firetests:

<a  target="_blank" href="http://www.baubiologie.at/download/zertifikate/F90.html";>http://www.baubiologie.at/download/zertifikate/F90.html</a>
This Austrian certificate shows the successfull 90 minute test of a
SBC plastered with lime on the exposed side, and earthplaster on the
unexposed side, using 20mm of plaster on both sides.

The succesfull Danish firetest of an earthplastered SBC was only 30min
long. A few things might still be worthwhile noticing:
- - the average as well as maximum temperature rise on the unexposed
side after 30minutes of testing was 1 (one) degree.
- - one of the criteria for failing the test is that the surface behind
the exposed plaster is charring. The normal procedure to determine
whether this has happened is to chip away the plaster in 1-3 spots. As
none of these spots showed any charring, the person in charge of the
testing (who didn't much fancy SBC), ordered his men to remove the
entire surface of plaster (2,4x2,4m). Unfortunately I was not present
during the test (although I build and plastered the wall), but i have
been told by eyewitnesses that it was not an easy job to remove the
plaster. To say the least.
- - two 100x100mm timbers had been placed flat with the exposed plaster
surface to simulate the by far most commonly used SBC in Denmark, the
post and beam infill SBC with earthplaster. The hope was to be able to
estimate the burning of the posts set in the plaster, to be able to
calculate dimensions better. Expecting the plaster to chip away on the
sides of the posts, thereby being exposed on three sides, it was
feared the posts might possibly totally burn away if we went for 60
minutes, leaving no evidence to make calculations from. As it turned
out the plaster stayed intact, and the posts only burned from the
exposed front. The loadbearing wall (with the two posts looking like
infill) was not compressed.
- - the person in charge of the overall testing programme (fire,
insulation, moisture, sound, mold and more) has been following the SBC
in general for minimum 5 years. Having written the Danish report with
resumes of all the tests as well as recommendations regarding how to
build with these results in mind, and having read a lot of the
testresults around, I think he is the most qualified person to hold an
opinion on this matter in Denmark. And although his speciality is not
plasters, this is his opnion on testing an earthplastered SBC:
a) the Danish test would most definitely have done well around the
posts if it had gone for 60minutes instead of 30minutes.
b) with uninterrupted earthen plaster straight unto the plaster
120mins is not unrealistic.
c) It is possible that plaster containing cement will flake off
earlier than clayplaster will, due to the fact that chemically bound
water is released from concrete when heated. The force of the steam
then causes the flaking. Earthen plaster is more open, so the steam
can get out, and it happens a lot earlier, as the water in earthen
plaster is not chemically bound.

Lars Keller
Denmark




2006/4/27, Rob Tom archilogic@...:
> Bruce, King of Sausalito wrote:
....


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