[papercreters] Re: Exterior covering

Simon,

Thanks for feedback and the experience of hundreds of years with a wet climate.

I gather that limewash has worked and is satisfactory, but requires annual reapplication (I think Charmaine said that in dryer climates, it did not need such frequent application).

I gather that line render (UK or lime plaster in the USA) is also satisfactory and requires less frequent reapplication.

I think we have a difference of opinion on latex or acrylic paint. Some people are satisfied but some are still concerned.

I seem to remember from a post on another group that in the UK, oil paint has been changed and is no longer like it was twenty years(?) ago. In the USA, we have a similar problem. Research and improvements continue on latex, but nothing is being done to improve oil paint. In the USA, arbitrary reductions in the amount of VOC have been made. Yet the manufacturers have not been doing the research to keep the performance of oil paint satisfactory with lowered VOC. That might be what happened to your oil paint. We both may have to start making our own to get the quality we need.

I am not sure we are talking about the same things so I will start threads about the definitions of lime wash and lime render (or lime plaster).

Bobby

--- In papercreters@yahoogroups.com, Simon Garrett <Sn.Garrett@...> wrote:
>
> Hi Leah , Clyde and Bobby,
>
> I am writing from Wales UK where we have long experience of building
> with lime and also a wet climate. Here traditionally buildings were
> built from stone and lime mortar (well into the last century); then
> limewash was applied on an annual basis (it's wet here!). The limewash
> protects the stone and mortar and over the years builds up into a
> beautiful smooth covering. Lime does not hold water, it is the most
> permeable commonly (and cheaply) available coating so while it does get
> wet it will dry out very quickly. Our old buildings were built without
> modern damp proof courses in walls and floors but most of the time if
> they are maintained they will stay dry and damp free. However if they
> are covered in anything non-permeable, for example cement render, they
> will almost certainly become damp: moisture still gets in but it can't
> get out. The same applies if latex, acrylic, or oil based paints are
> applied, they are not water permeable (at least the ones we have here in
> the UK aren't) so they trap moisture which will eventually build up
> enough pressure to break through.
>
> I must stress that I am talking about walls, i.e. more or less vertical
> surfaces, here so there's no possibility of puddling, and also the walls
> are themselves water permeable so they are different to a cementitious
> papercrete mix (although I think they would behave very much the same as
> a lime based papercrete).
>
> I hope this is at least a little useful!
>
> Simon.
>
> P.S. Someone mentioned lime plaster as an external coating: in the UK it
> would be called a lime render and it would definitely not need
> reapplying every two years; it should last for centuries!
>




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