You could put shade cloth over the plastic, or even build a second, smaller hoop within the first that you could have the shade cloth attached to (if you don't want your shading action to be so obvious to passerby who understand WHY you keep that shade schedule, lol), but your primary sheathing should be poly. The shade cloth is just meant for darkening, not for actually keeping the elements out.
It's not going to be a factor for my friend, who is WAY too paranoid to even CONSIDER growing pot! haha
stinkyattic Reviewed by stinkyattic on . Build-A-Long with Stinky: $150 PVC greenhouse One of my co-workers is constantly bugging me for garden advice and loves Italian food... Since my saltwater fishing trip plans got rained out this weekend, we got a bright idea to build her a greenhouse instead so she can grow enough tomatoes and peppers for herself (and the rest of the county). The finished size is 10' x 20' and will be an insulated structure framed in PVC and sheathed in 6mil poly. It will be strong enough to hang minimal lighting from. So here's the parts list: Rating: 5