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Forum URL: http://www.truefresco.com/cgidir/dcforum/dcboard.cgi
Forum Name: Fresco Painting (original forum)
Topic ID: 146
#0, arsenic treated lath and lime plaster
Posted by dulce_domum on 27-Jul-05 at 10:53 PM
I have been asked if the arsenic in pressure-treated wood lath would react with the lime in a lime plaster. Does someone here know if it would and in what way?

#1, RE: arsenic treated lath and lime plaster
Posted by admin on 30-Jul-05 at 02:57 PM
In response to message #0
interesting question...

i am tempted to say that it would react the same way as with the regular stucco (just fine), however some may come to the surface and affect the colors and that may not be good.

Why would you use pressure treated lath? I understand that it suppose to last longer in the dump condition, but the dump condition (if plaster is dump for a prolonged period of time) will destroy the plaster on it's own before any lath goes bad... Getting wet and dry (as exterior wall) is fine - just makes the wall stronger, but dumpness is a plaster killer.

So, really using pressure treated lath is an overkill that does not make the wall to last longer.


#2, RE: arsenic treated lath and lime plaster
Posted by Dulce_domum on 30-Jul-05 at 08:12 PM
In response to message #1
Thanks for the reply. I did not choose the lath. This is a question posed to me by an architect working on a building restoration. It seems the lath was put up before she had come to the job.

Thanks, again!


#3, RE: arsenic treated lath and lime plaster
Posted by Farago on 12-Aug-05 at 04:52 AM
In response to message #2
Hi, Arsenic was used in ancient times to make certain lime based plasters set quicker.Dont know if this helps any.
Cheers Dean

#4, RE: arsenic treated lath and lime plaster
Posted by Dulce_domum on 12-Aug-05 at 06:17 AM
In response to message #3
Thanks, Dean!

#5, RE: arsenic treated lath and lime plaster
Posted by admin on 12-Aug-05 at 10:20 AM
In response to message #3
>Hi, Arsenic was used in ancient times to make
>certain lime based plasters set quicker.Dont
>know if this helps any.
>Cheers Dean

good to know, thanks