hello,
As I'm not english native speaker I probably made a mistake... I
thought render means the last finished earth layer... It seems this
is not the case...
Thus to summarize, in our building the earth plastering is done but
we still need to do the last finish layer... At the moment we have
more or less 5cm earth on the straw bale walls.
Regarding the first house where they made the blower door test, on
the basement walls they only put 1.5cm earth plastering and the
finish layer is not done yet...
I hope this is clearer now ;-))
Thx
Seb
On 21/04/2011 18:34, paul paul wrote:
Â
To try and answer your question Carina, it looks like
they use the word ârenderâ to mean interior undercoat,
before a top or finish coat of plaster is applied. In this
case, an undercoat of plaster was not applied first, which
is why the total thickness of applied plaster was quite
thin. As I said in my first post , sometimes an interior
undercoat is called a ârenderâ, possibly because quite often
the undercoat would be cement/lime based, like an exterior
render, and then finished with a gypsum plaster top coat.
Â
Paul
Sent: Thursday, April 21, 2011 6:29 PM
Subject: Re: [Strawbale] Air tightness and
earth plastering
Â
Hallo,
If render and plaster
is he same, than what is meant with the problem of
the air tightness in the passive house. There was
said that the air tightness was not so good because
of the failing render but then earth plaster was on
it!
Â
Greetings,
Â
Carina
Â
Â
As far as I know, they are
the same. Here in the United States we say plaster.
When I was in Australia teaching last month, they
spoke of render. I don't know of a difference.
Andrew
2011/4/21
Carina Simons <carina.simons@gmx...>
Hallo to
everybody,
Â
Since I am not a native English
speaker I do not know the differents between a
render and a plaster. Can anyone explain that
to me?
Â
Many greetings,
Â
Carina
Â
Â
Hello everybody,
Till yesterday I was pretty confident that
it was possible to make a good air
tightness using earth plastering.Â
Yesterday an other professional called me
regarding air tightness. His neighbor and
him did a blowerdoor test to verify the
airtightness of their 2 passive houses
(should be passive). The result was not
good. The n50 leakage rate is
supposed to be smaller than 0.6. The
building must not leak more air than 0.6
times the house volume per hour (n50
â 0.6 / hour) at 50Pa (N/mÂ) as tested by
a blower door.
He obtained n50 = 1.2 and it
was 0.95 for the second one. They worked
2 days trying to find what could be the
problem and didn't find any major
leakage. There was 1 point that could be
a problem. A basement wall that is part
of the living space get only 1 layer of
earth plastering but no render. The
thickness is more or less 1.5cm. They
decided to glue a airtightness sheet (1
square meter) on this wall. They blew the
air outside of the building. Then they
saw the sheet (that has been glued)
inflating meaning that the earth
plastering was not airtight.Â
Of course, I have to say that it would be
better to put the render on this wall.Â
Airtightness should be probably better.Â
I'm building a straw bale (this is our
house) and we really want a good
airtightness. For the wall, the earth
plastering is supposed to do the
airtightness. We are going to make a
blower door test before finishing the
details. This means the renders are not
ready yet because we will put the last
earth layer on the wall and ceiling at the
same moment. This will be done after the
blowerdoor test. This means that the
blower door test will perhaps not be
successful.
What do you think about it ?
Does anybody already make a blowerdoor
test with earth plastering airtightness ?
I would really appreciate a feedback.
Many thanks
Cheers
Sebastien
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Send all messages to:
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____________________________________________________
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Send all messages to:
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Archives, subscription options, etc:
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