[Cob] Limewash/Whitewash and other permeable paint options

[Henry Raduazo]

Simon: I did two layers of horse manure and clay on my wall, then a  
thin layer of lime putty (2 parts sand one part lime) then two coats  
of lime wash. I sprayed water on the lime layers three times a day  
with a 2 gallon insecticide sprayer. You can't rub my lime off. I  
don't even think you can sand it off, and I have not redone my wall  
for ten years. It is an interior wall with out much rubbing, but that  
would not matter. If you go over to Mt. Vernon, George Washington's  
estate, You can see the walls of his estate are still in good shape  
after many years. His walls are wood siding grooved to look like  
masonry and painted with whitewash and sand just like my wall. The  
main thing that you need to remember is to use Mason's lime or  
"Limoid" or hydrated lime (all names for the same thing).  I get  
something called Limoid at a masonry supply store. It comes in 50  
pound bags. It has lots of impurities in it so it is not edible grade  
but it is cheap. Just add water and use, or store in a sealed drywall  
bucket covered with a layer of water. You should be able to make a  
bench and sit on the bench with out getting powder on your clothing.  
If your lime does not harden like, this it is no good.
	DO NOT USE GARDEN LIME. That is just ground up limestone. It will  
not harden and it will powder off.
Ed
On Mar 6, 2009, at 9:07 AM, Simon Matthews wrote:

> I am currently building a light earth 6mx4m room and have just  
> completed
> the second coat of mud render. So far everything has gone well,  
> with the
> usual caveats of it taking longer and being more work than expected. A
> 6mx4m room shouldn't be a big job should it?
>
> I was going to use whitewash without additives on both the internal  
> and
> external walls,but after much research which has produced a huge range
> of options i am not so sure.
>
> My main concern is the durability of the whitewash. The consensus  
> seems
> to me that the whitewash will have to be redone every one to two years
> and is easily rubbed off.
>
> I would like to know other peoples experience and thoughts about
> whitewash, whitewash additives and other permeable paints before  
> making
> a decision on what to use.
>
> By the way i found some good information on whitewash and other paints
> on these sites
> http://www.buildingconservation.com/articles/lwdistempers/ 
> lwdistempers.htm
> http://www.buildingconservation.com/articles/vapour/vapour.htm
> http://www.ncptt.nps.gov/index.php/durability-of-traditional-and- 
> modified-limewashes/
> http://www.ncptt.nps.gov/index.php/application-and-preparation-of- 
> limewash-video-2008-07/
>
>
>
> Thanks
> Simon
>
>
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