i have a 20x36x12 gothic GH. Link in signature.
I ran cables the length of the GH every 5' and draped panda film over that (actually farmtek poultry blackout ) . It was pretty easy to haul back and forth. like this...
next year Ill hang it on pulleys or runners so it slides a little easier, but it definitely got the job done.
I get high winds here, I dont think an exterior dep tarp would survive very long. Also, winters, snow, etc.
I only need the dep tarp on 1-2 out of 4 runs a year, so this just made a lot more sense.
heat pumps, quest dehuey, CO2, drip irrigation FTW