In general terms, plasters are for the inside and renders (or stucco in the
US) are for the exterior. You wouldn't say âI'm going to render the wall of this
bedroomâ, instead you would say you are going to plaster it. Likewise, you
wouldn't say I'm going to plaster this exterior wall, you would say you are
going to render it. If you were going to plaster an interior wall with a
sand/cement render for an undercoat, then you might say âI'm going to render
this wallâ, so it can be confusing; But in general, render outside, plaster
inside.
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,
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
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 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.
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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