How airtight does it need to be?
So I'm building a greenhouse out of old windows and using some corregated plastic as well. It's turning into one of those nightmare projects that just keeps going and going but it will be fab when it's done. My plan is to use it from Sept-Nov and then March-May. I have no intention of heating it and I'm pretty sure getting it airtight will be impossible. I was thinking I'd probably put a sprinkler with a timer and have it come on once a day, like I do with my garden in the summer. My question is, if I'm watering it anyway why does it need to be so airtight, a little rain inside won't matter, right? Also, how much of the warmth will stay inside if it's not airtight (and by this I mean tiny little leaks here and there)? This is a weekend home so I won't be able to do anything on a daily basis besides the timer. Am I living in a fantasy world with my idea?