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permaculture - Re: [permaculture] Whitewash Bob's Roof Day plus Mapping/data site find story on white roofs impacts

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  • From: "John D'hondt" <dhondt@eircom.net>
  • To: "permaculture" <permaculture@lists.ibiblio.org>
  • Subject: Re: [permaculture] Whitewash Bob's Roof Day plus Mapping/data site find story on white roofs impacts
  • Date: Thu, 19 Jul 2012 21:27:24 +0100

No, Bob, the whey is surplus for that is where most of the acidity is found. And acid and lime are not a good combination. It is not all that critical though. Hydrated lime is highly alkaline and able to take a little acid. We poor sufficiently sour milk through a cotton pillow casing. That can drip for 24 hours or longer and we don't wait that long unless we want to make cheese. Soft cottage cheese is about the right consistency. Add at least as much volume lime and mix it up then dilute with some water if necessary.

We have found this hard wearing on timber and concrete and we also use it on living apple trees where the bark is under attack by bark cancer fungus. Even on the growing apple trees it is persistent for at least two years and on concrete for at least 6-7 years in our wet climate. Regular white wash with just lime and water needs to be replaced every year or sooner here.

I did not invent this. I read about it in some old book ages ago and had to try it out. Sorry I can't give you any online references off hand. And I was pleased with the results. It is not as white as regular white wash but that was no problem for us. And also we have enough milk here to make that not a problem. And hydrated lime is still a common building material here.

All the best,
John in Ireland


This is interesting. Do we want only the whey, or is the whole soured
milk workable? Or should I find some casein powder and add that? Do you
also add water too, or is it strictly lime plus soured milk?

I appreciate the tip.

Bob Waldrop, OKC

On 7/18/2012 6:14 PM, John D'hondt wrote:
Another version might be lime + milk (actually early cottage cheese, milk
gone sour that is releasing the whey. What you need is caseine) We have
found this very hard wearing and heavy-rain resistant as lime and water is
definitely not.
john

We had several last-minute glitches we have not gotten this
done. The first problems were rain, as we had an unusually wet June.
Then we had a hard time actually finding hydrated (slaked) lime. None of
the usual suspects I had access to (Lowes, Home Despot, Ace Hardware)
stock it anymore. I have now tracked down some (from a tack shop) and
will do a fence and then we will see about doing the roof. I am doing
the fence first to try out two or three different formulations for
whitewash, as there are lots of recipes out there. I am going to try one
version that is only lime and water, another with some salt added, a
third with salt added plus letting it sit overnight before using it. A
chemist friend says that the effect of the added salt and letting it sit
is to make it easier to apply, but the cost is some of the whiteness.
So we will try a fence before we do the whole roof.

Bob Waldrop, OKC

On 7/18/2012 10:05 AM, Ken Morneault wrote:

Hi Bob,

Any feedback on the performance of the whitewash yet?

Regards,

Ken



________________________________
From: Bob Waldrop <bwaldrop@cox.net>
To: ROE2 <runningonempty2@yahoogroups.com>; permaculture
<permaculture@lists.ibiblio.org>
Sent: Friday, April 27, 2012 9:34 PM
Subject: [permaculture] Whitewash Bob's Roof Day plus Mapping/data site
find story on white roofs impacts

Whitewash Bob’s Roof Day is coming up June 2, 2012, this is a free
workshop at my house in OKC, where we will whitewash my roof.

For info on the benefits of white roofs, see . . .

http://www.builditsolar.com/Projects/Cooling/WhiteRoofExperiment/WhiteRoof.htm

For info on the whitewashing of roofs, a very cheap way to get a white
roof, see. . .

http://www.theatlanticcities.com/design/2012/04/just-fraction-more-white-roofs-could-have-huge-global-impact/1764/

There’s also a thread in the archives of this group from last year.

Anyone in the neighborhood is welcome to stop by. Let me know you’re
coming by email to bwaldrop@cox.net or by signing up with the FB event,
https://www.facebook.com/events/286135491467827/ .

I am also participating in an experiment that will apply a non-toxic
coating after the whitewash has cured. The goal is to extend the life of
the whitewash from 2-3 years to 8-9 years.

A full report will be written and posted.

Bob Waldrop, OKC
https://www.facebook.com/prairierosepermaculture




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