[Strawbale] Air tightness and earth plastering

[Andrew Morrison]

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 at gmx...>

>  Hallo to everybody,
>
>
>
> 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?
>
>
>
> Many greetings,
>
>
>
> Carina
>
>
>  ------------------------------
>
> *Von:* strawbale-bounces at amper....muni.cz [mailto:
> strawbale-bounces at amper....muni.cz] *Im Auftrag von *Sebastien Hubert
> *Gesendet:* Mittwoch, 20. April 2011 22:53
> *An:* strawbale at amper....muni.cz
> *Betreff:* [Strawbale] Air tightness and earth plastering
>
>
>
> Hello everybody,
>
> Till yesterday I was pretty confident that it was possible to make a good
> air tightness using earth plastering.  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 ≤ 0.6 / hour) at 50Pa (N/m²) 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.
>
> Of course, I have to say that it would be better to put the render on this
> wall.  Airtightness should be probably better.
>
> 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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Andrew Morrison
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