Doing a new build greenhouse - 10 x 14. Mostly 2 x 2 wood with some found 2 x 6, 2 x 4 and 2 x 3s where most appropriate.
I've got SunTuf corrugated polycarbonate panels for the roof. I can install them horizontal or perpendicular.
I think the benefit of perpendicular would be that snow would more easily fall/melt off. It seems possible that if horizontal, the ridges could hold snow (blocking light and adding weight stress to the structure).
I think the benefit of horizontal would be that I could install them so they don't quite meet at the top and then cap with the available top caps. I think I could rig a way to easily install, uninstall them to help in summer ventilation.
Does anyone have any experience with this or thoughts relevant?