Impact screen question

[Teddysquid]

I am setting things up in my garage which has 9ft ceiling. My goal is to attach my screen at the top and leave the sides free. I read some people have used some weight to anchor the bottom as well with snake sand bags. I was wondering if anyone has a similar setup for attaching their screen. If so, how much longer did you order your screen to be able to weigh down at the bottom and does gravity do a good job at keeping the screen without too many wrinkles?

thanks!