permaculture

["John D'hondt" <dhondt@eircom.net>]

Yes polycarbonate is the exception, I know. The disadvantage is the cost 
which is not far below toughened glas here and higher if you go for double 
or tripple profiles. Since the question was about cheap plastic I did not 
think of poly carbonate.
john

> I have had GE Polycarbonate double glazed sheets on the roof of my Atrium
> for 12 years and they have not discolored and have served us great.  They
> cover an area that is 16ft X 8ft and work very well.
>
> Scott Pittman
>
> "Another world is not only possible, she is on her way.
> On a quiet day, I can hear her breathing."
> ~Arundhati Roy
>
> -----Original Message-----
> From: permaculture-bounces@lists.ibiblio.org
> [mailto:permaculture-bounces@lists.ibiblio.org] On Behalf Of John D'hondt
> Sent: Sunday, January 13, 2013 5:08 PM
> To: permaculture
> Subject: Re: [permaculture] Double pane plastic windows?
>
>
> I don't know anything about your specific plastic windows but most all 
> clear
>
> plastic will turn opaque in sunlight. I can't immagine you will have a 
> clear
>
> outlook for ten years and possibly a good bit shorter if the plastic is 
> not
> specially UV protected.
> John
>
> We just found an extremely cheap source for insulated plastic windows
> (double pane).
>
> My questions is: Does anyone have experience with using these? Especially
> versus glass?
>
> I cannot find much infomation on their efficiency letting light in,
> retaining heat, etc.
> We cannot afford a glass greenhouse right now, but if the drawback of
> plastic windows are relatively small we might piece together one.
>
> Thanks all.
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