I knew this was too large for my upper deck, but I desperately needed something to block the hot summer sun coming from the west. My son in law cut about a foot off the length, and bolted it down to the trex. We also get high canyon winds, so I just gather the material on both ends with a bungee cord so it doesn't flap around. It works great blocking out the sun, we can now enjoy it any time of the day. 
LOVE IT!!!