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Re: GSBN:Interesting test results
Hi Chris, the maximum of 10 mm per layer seems to be necessary for that
capillary break. Capillary breaks can be reached already by say 5 rather
thin layers (1-2 mm) applied by brush. Thats interesting for clay protection
of clay stuccos. This works very well in Ouwerkerk.
The drying period in between the layers varies according the hydraulic
component, the moisture in the air, the sunshine and of course the
thickness. Quick hardening through sunshine has some negative effect too.
The best is to ask the producer about specifics, as there is a range of
limes with different behaviour.
----- Original Message -----
From: "Chris Magwood" TLSEditor@...
To: "GSBN" GSBN@...
Sent: Monday, December 13, 2004 9:24 PM
Subject: Re: GSBN:Interesting test results
> I was always under the impression that lime was built up in thinner
> layers because of the need for the lime plaster to recombine with
> atmospheric CO2. If it goes on too thickly, not only will it crack
> because of it's own weight sliding down the wall before it sets, but
> it won't cure fully because the stuff that's buried deep won't
> carbonize properly. But somebody with more lime knowledge might be
> able to shed more light on this subject!
> I think what the testing at Queen's suggests is that regardless of
> the kind of plaster or its final compressive strength, the thicker it
> goes on, the stronger the final wall assembly. This is not surprising
> in itself, but what surprised me was that the thickness made so much
> more difference than the plaster strength. Better to have 30mm of
> quite weak plaster than 10mm of super strong stuff. I think it helps
> make the case for earthen plasters, which like to be thick and don't
> cost a lot to make thick, and who cares if they're not quite as
> strong as a cement-based plaster.
> >for lime one layer should not exceed more than 10 mm due to moisture
> >protection, so building up thickness traditionally is done in layers
> >(normally 3). Does this team is confirming this tradition?
> Chris Magwood / Camel's Back Straw Bale Construction
> <a target="_blank" href="http://www.strawhomes.ca">http://www.strawhomes.ca</a>
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