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. Justin Woodville, TX 8b/9a _________________________________________________________________ Windows Live™ Hotmail®:…more than just e-mail. http://windowslive.com/explore/…