From: muratlanne@gmail.com   
      
   "Morris Dovey"  wrote in message   
   news:jhe6pm$der$1@speranza.aioe.org...   
   > ...> You might be very pleasantly surprised by the performance of twinwall   
   > polycarbonate glazing. If you orient the channels vertically, it may even   
   > extend the collection day. :-)   
   > Morris Dovey   
      
   Do you know how it compares as collector glazing to Suntuf polycarbonate   
   panels from Lowe's or Home Depot?   
      
   I have roofs of Palram Suntuf over cheaper clear PVC that have held up well   
   to sun, weather and falling branches for several years. Although the   
   corrugation shapes don't match the pitch is the same and together they will   
   support at least two feet of snow.   
      
   I'm long-term testing what I think is the most economical durable glazing,   
   after being quoted ~$80 per 4'x8' sheet for the twinwall. PVC alone becomes   
   quite brittle from UV but one layer of Suntuf seems to protect it.   
      
   My house windows have two layers of clear Mylar film on wood frames for   
   extra insulation, installed in 1981 and still doing fine.   
      
   jsw   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)