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Old 05-13-12, 07:14 PM   #34
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Originally Posted by lucerne96 View Post
I would do some research to check out what the potential interaction might be between whitewash and the material your roof is composed of. I know that a problem has recently been observed around the use of copper flashing & wood shake roofs; because of the wood preservative being used leeches out & reacts with the copper.

You might also consider if it matters that the whitewash will change the Ph of the ground surrounding your house, potentially having an effect on whatever is growing there.
Whitewash is just calcium carbonate (limestone) and has no detrimental effects on a composition shingle roof with no flashing. I live in an area with acidic soils and have to add lime to the garden soil from time to time to raise the pH. Any calcium carbonate leached from the whitewash on the roof would have the same effect as liming the soil.

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