You'll have to measure the length and width of your roof panel and multiply them together. Find the area of each separate panel and then add them all together for your total roof area.
If there's anything within 6 feet of your roof, rats can easily jump onto your roof. If there are any tree branches that are going in the area, trim them...
You can try to repair the roof yourself. Get the tiles off your roof and put some building plastic as underlayment that hangs in the gutter. This does not fix...
You must ROTATE the map, and not keep it stationary as it appears on the page. Draw your floor plan and mark the front door's position on the plan. Then...
Honestly, I'd just recommend trying a few different pairs out. I think +1.50 is good for the computer, and +2.50 is generally a solid choice for reading, but it doesn't...