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permaculture - Re: [permaculture] Whitewash for roofs?

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  • From: Jay Woods <woodsjay@cox.net>
  • To: permaculture <permaculture@lists.ibiblio.org>
  • Subject: Re: [permaculture] Whitewash for roofs?
  • Date: Mon, 8 Aug 2011 19:13:21 -0500

On Monday, August 08, 2011 04:51:53 PM Bob Waldrop wrote:
> This is really interesting, I hope you are able to contact the author, I
> didn't notice an email on the page. I'm also wondering, if it does wash
> off, of the consequences for my soil. Reduce acidity I guess. . .

If the slaked lime is high quality, it is pure Ca(OH)2. On the roof it reacts
over to lime - CaCO3. It will slowly (over a couple of years) dissolve in
pure
rain water and end up in the soil as lime. In areas with lightning it will
dissolve in the weak nitric acid from the nitrogen oxides dissolved in the
rainwater and show up in the soil as lime as the nitrates are used by the
plants. In areas with acid rain from sulfur burned in coal, it will rather
quickly dissolve in the rainwater and show up in the soil as gypsum -
CaSO4.2H20.

>
> Bob Waldrop
>
>
> -----Original Message-----
> From: Ken Morneault
> Sent: Monday, August 08, 2011 4:27 PM
> To: permaculture
> Subject: Re: [permaculture] Whitewash for roofs?
>
>
>
> A very intriguing idea....I have a vaulted ceiling that I'd like to better
> insulate against summer heat but haven't due to have to redo
> the insulation / re-sheetrock (unless someone has a better suggestion).
>
>
> Here is a posting I found that sounds promising:
>
> http://www.builditsolar.com/Projects/Cooling/WhiteRoofExperiment/WhiteRoof.
> htm
>
> I may contact David to see how the whitewash is holding up a year later.
>
> Regards,
>
> Ken
> Georgia
>
>
> ________________________________
> From: Bob Waldrop <bwaldrop@cox.net>
> To: permaculture <permaculture@lists.ibiblio.org>
> Sent: Monday, August 8, 2011 2:33 PM
> Subject: [permaculture] Whitewash for roofs?
>
> The energy savings of white roofs appear to be well substantiated. But
> painting your roof can be expensive.
>
> There is however a lower cost way to achieve whiteness and that is
> whitewash. Here’s basic info from wikipedia on the subject.
> http://en.wikipedia.org/wiki/Whitewash . The goal of course would be to
> achieve the energy savings available from white roofs at a lower cost than
> conventional paints, even though it would have to be reapplied every few
> years.
>
> I was wondering if anyone had had any actual experience with this. In
> particular, I’m curious about how whitewash would adhere to asphalt
> shingles. If this would work, it could be a boon to low income communities
> everywhere.
>
> Bob Waldrop, Oklahoma City
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>
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