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RE: GSBN:Borax in plaster

Hi to all,
A couple of years ago, one of my owner builders was rendering in our wet
season. He tried to dry the walls with conventional heating which merely
caused seed in the chaff used in his render to germinate. We found the
solution was to use fans to circulate the air, combined with a gas
radiant heater. The render had about 5% lime to sand and clay. There are
no signs of mould even in the bathroom.

Brian Hodge

-----Original Message-----
From: GSBN [<a  target="_blank" href="mailto:GSBN@...";>mailto:GSBN@...] On Behalf Of Dirk
Scharmer- FSB
Sent: Tuesday, 11 July 2006 4:47 PM
To: 'GSBN'
Subject: RE: GSBN:Borax in plaster

Moin, moin

As Andr&eacute; said: By earth plastering late in the year, ventilation (we had
very good experience in using several non heating ventilators in one
room by blowing the air directly on plaster surface, it will dry fast
and reliable) is the most important and effective way (heating could
increase mould danger).

In case of plastering straw bale walls: The temperature and humidity
monitoring of walls in the 3-storey SB-House "Strohpolis" (plastering
finished in november) showed clearly: Not potential mould on/in the
plaster was the problem, but the inside of the wall, more precisely the
outer 10cm straw. Conditions of potential mould (>80-95% r.H.) can
persist nearly one year after plastering. There was no mould in
Strohpolis, but after all we know about straw: Plastering in (germany's)
autumn is no recommandable way. Let's practise more safe way's without
adding chemicals and try to get finished in September. 

Borax in the plaster wouldn't solve the real dangerous problems inside
the straw. 

Dirk Scharmer

Fachverband Strohballenbau Deutschland e.V. 
Auf der Ruebekuhle 10
D- 21335 Lueneburg
Tel. 00 49 4131- 727804
Fax. 00 49 4131- 727805 
Internet: www.fasba.de
Email: ds@...

-----Original Message-----
From: GSBN [<a  target="_blank" href="mailto:GSBN@...";>mailto:GSBN@...] On Behalf Of Andr&eacute; de
Sent: Monday, July 10, 2006 11:06 PM
Subject: GSBN:Borax in plaster

Hello baleheads,

One of our workshop participants asked me if they can earth-plaster
(inside) late in the autum. (of course they know that it is better to
plaster during summer but time flies... I suggested to ventilate and to
make sure the moisture laden air gets out of the house. They might heat
the house also (but I'm conviced that ventilation is more important,
like stirring a cold coffee to dilute the suggar rather than hot coffee
without stirring). I remember reading that one can also add borax to the
earthen plaster to avoid mould. Does any of you have exp?rience with
borax in the plaster. And how much would you advice to use?

Thanks for your advice.

Warm bale greetings,

Andr&eacute; canyoupleasescrapeoffthatmouldofmyback de Bouter