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Old March 18, 2007   #6
mouse
Tomatovillian™
 
Join Date: Jan 2007
Location: usa
Posts: 25
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Just a crazy thought: for a project of this dimension, the top could be made out of PTFE film, Tefzel [Dupont]or Hostaflon [Hoechst].

Tefzel used to be available in a form that had one edge with adhesive. See Eden Project, Cornwall, UK, visualize, longitudinal 'pillows'. Very good lightweight double-walled, high-insulation top requiring comparatively less structural support while shedding snow/wind/rain.

Tallman & Demarest, architects, Ithaca, NY, well-versed in these pillows. I have no financial connections whatsoever with them.

PTFE can also be used for a lightweight half-hoophouse, 2 layers, inflated. Much, much lighter than plastic, high light transmission, strong. Worth a thought for future projects.

m
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