Impact Screen Size Help

[billyh7]

This is my detached garage. Which size screen would work best. I can go a little higher but the left corner would be cut out by the angled roof. Attached is picture.

[jb1]

A 4:3 aspect ratio (screen width compared to height) is very common. So say the frame dimensions are 10.5' wide x 8' high; how you attach the screen to the frame will lose some space.....for my screen, it has webbing and grommets for attaching with bungees, and it loses 2.5" on each edge. Width of screen image 126" - 5" = 121". Height of screen image 96"-5"=91". This is a perfect 4:3 aspect ratio for a projector. That's just one idea.....