| Ray's comment is in agreement with the statements on the protective sheathing covering the sheets I bought a couple of months ago. I've used polycarbonate for the last 7 years on two projects and find it superior in all critical aspects: ease of installation, R value, hail, aerodynamics, snow shedding, low maintenance. Anyone interested in glazing a growing area with polycarbonate really should read up on all pertinent matters. Sundance Supply is an excellent source of materials and extensive information, the both of which are fully accessible on their website [https://www.sundancesupply.com/index2.html]. This address will take you directly to the page that gives so-called "real world" data on R values, etc. of greenhouse glazings. Here in the Dakota's, too, electricity is far less expensive for heating than propane or natural gas. It helps, too, that at middle latitudes, I don't waste heating money on glazing the north, east, or west walls, or the north half of the roof. Paul On Jan 2, 2006, at 10:49 AM, First Rays wrote:
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