Nice thread/GH.
Just read the whole thread. I'm new here. Did have a couple of thoughts while reading.
Water holding tank: the 'bottom' blocks are turned wrong, may collapse.
Heat and cold; If you want to moderate the inside temp. more, put 'blue board' into the ground around the perimeter. A foot will help, two would be better. 2 might even get you below the frost line?, depending on your winters.
To stay cooler in summer and warmer in winter: Dig your walkways Down. The earth is normally in the low mid 50s F year round.
Lowering the walk way would also give you more 'headroom' in the middle. You could then utilize the middle of the 'walkway' for tall plants in large pot?s.
If you really want to cool it. Dig in a long length of pipe as an underground duct/intake. If you have enough pipe/slow enough airflow, the air will come in at 52-54 degrees.
If you want heat use raw chicken manure to fertilize your inactive bed areas. It is hot and you get nutes plus heat.
Not meaning to be critical, just thoughts that might make life more peaceful in the GH. :^)
If things progress as hoped here, I may have to do a GH too.
What a great and inspirational thread, GP73LPC! I couldn`t stop myself to read it from start to end.
if you build it, the plastic i used will only last 8-10 months.
when i run out of that home depot plastic, i will be covering it with something designed for a greenhouse that holds up to UV rays.
70-75% transmission translates into stretchy plants and less resin. I had bronze-tinted lexan panels from Lowes last year and later in the season I bought an expensive light meter to check the transmissivity of those panels. It was a pathetic 50% at best. My girls grew to the ceiling of the patio roof, but they were noticeably less resinous than similar seeds grown outside.
This year I replaced the tinted panels with clear....92% transmissive. The close internode distance and tightness of their bushy structure has been obvious from the start. I'll let you know at harvest how the resin flows.