Anna - my GH is 40' x 20' wide....and I bought a shade cloth mat'l to that spec from a horticultural supply company. when I remove the plastic covering (for my winter protection) in the Spring....I store that away and replace it with the shade cloth to protect again the blistering sun of June
.....and July.....and August. (I'm trying to upload pictures but somethin's not workin' right)
Anyway.....the shade cloth essentially drapes across the framework and fixed in place after being pulled taut corner to corner.
