I am so frustrated with a bay window roof that is leaking. It is a flat roof about 7 feet by 3 feet. Just above the bay window is our bedroom window. I have used caulking around the exterior of the window frame thinking the rain was coiming from there. But is still leaks. There are 2 valleys that may be the culprit. I need some pointers on how to stop this once anf for all. I have used gallons of roofing cement and that is not helping.