What is the best way to build a 24' X 24' stand-alone screened in building? I bought an above ground pool for $100 and want to screen it in completely...including a screened roof. I have 2 rolls of 8' wide by 100' pool and patio screening. I'd like to space the supports/frames at 8' on center to staple the screens to them. What size ridge beam would I need to support the screen and four rafters on each side? Could I use tensioned cables for the ridge and wood for the rest?