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Re: Collecting rain off of the roof

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----- Original Message ----- From: "Ronald E Menold II"
<menoldre@va.prestige.net>
>
>...
> As mentioned before, normal rain water only touches the roof for a
> short period of time.  (try throwing a tennis ball to the top of the roof
> and time how long it takes to come down.)  Unlike a solar water
> heater where the water is circulated through the pipes repeatedly
> thus spending far more time in the sun and on the roof than regular
> run off, regular runoff will not be so hot.  And if the water did take
> the heat of the roof into itself, the roof would be cool after the first
> few minutes of rain and any subsequent water would be ambient
> temperature.  So I would expect that rain water from the roof would
> be pretty much ambient temperature.  Also the short time on the roof
> would also not allow it to leach (significant) chemicals out of the
> roof.  Anyway oil (petroleum products) and water don't mix (just
> look at Italian salad dressing in a bottle, you have to shake it and
> then it still separates) Also if the roof material dissolved in water
> you wouldn't have much of a roof left after the first rain.  Now
> mechanical dislodging is another story, yeah you will get chunks or
> pebbles of asphalt in you water but they will just sink to the bottom
> of the barrel.

I would agree this is all probably true in most climates where there is lots
of rainfall.  But in our blazingly hot AZ desert sun, an asphalt roof will
deteriorate more rapidly, especially during the hot season when there is no
rainfall for 4 - 6 months.  Then when it does rain, the months of loosened
roof material all washes down during the first gully washer of the monsoon
season.
>
> ...
-Olin


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