I am no expert on shading coefficient but will offer an observation or two from growing under 'glass" - really Tri-Wall.
1. Being in Indiana I like the ability to remove the shading during the winter cloudy/drab months. Naturally as I write this the sun is out and bouncing off a fresh snow fall. 2. If (really when) a greenhouse gets hot during the hotter months then it helps if the shade cloth is lifted about 4 inches above the roof using some type of frame. I have found that using PVC water pipe is an easy way to do this. It will 'snap' together (don't even have to use glue) and can be taken apart for winter storage if this is desirable. Another thing that helps is to have the shade cloth in 2 pieces (open at the ridgeline) so that the hot air vents out. If the sunroom is a lean-to type then just leave a breathing space near where it joins the side of the building. I haven't used it but I understand that the aluminum shade cloth is very good at reflecting heat. Couple this with a frame and I would GUESS that it would be much(?) more efficient than dark glass at reducing heat. Jerry in IN _______________________________________________ the OrchidGuide Digest (OGD) [email protected] http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
