Show me a stain on a ceiling and I can trace it back to the exact spot where the water really gets in, even when it's three rooms over from the leak. Thirty years on roofs taught me that. But my knees ache climbing the ladder now, and I look at the young guys and wonder who's going to know how to do this when my body finally says no more.
More people experience this than they realize.
You can find any leak's true source, but you worry who will carry the trade when your body gives out.
If this sounds familiar, the Library can help you find the bigger picture.