Panels are a Vortex brand, back porch roof has a center ridge, roof measures 40 feet side to side, problem is each roof section is only max 6 feet from ridge to gutter, that was the reason for turning them in a horizontal vs vertical fashion. Tilt of roof is about 15-20 degrees from center ridge to gutters. Drawing wasn't the best, pool water would enter on the down slope (gutter side), back to pool water near the center ridge. Hope this helps clarify.