protected cold frames

Justin Smith
Wed, 21 Jan 2009 13:44:48 PST
Hi all,
What was said:> Regarding cold frames, UIi mentioned "polycarbonate (Plexiglas)" but > I think these are two different things, at least as the terms are > used in North America. I have Plexiglas on my older frames, and it is > not unbreakable; I've had it break when the wind blew something large > into a light, and also once when somebody stumbled and fell against > it. As I know the term "polycarbonate," it's a somewhat more flexible > material that comes either as Kathleen mentioned in double or triple > wall forms, or a corrugated form. I have the latter on my new frames, > and it doesn't break but can tear if struck hard by something sharp.> 
For those who have tough conditions. Like winds over 120 mph or you fear that polycarbonate and Plexiglas are not tough enough to withstand the occasional person with a sharp object falling on your cold frame. I would suggest a product called Lexan. 
A .5 inch thick sheet of Lexan along with 6 inch thick steel reinforced concrete sides. You would have a cold frame that would withstand a Russian nuclear attack.
Woodville, TX  8b/9a
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