How To Fix A Leaking Tiled Roof From Inside. Start low, soaking the area just above where the leak appears in the house. Imagine a torrent of water traveling on this same path.
If the problem is in the waterproof membrane, you will need to remove all your existing tiles and replace the old membrane with a new one. Put some water on the roof in different places and watch where it runs, or ponds. Check the pans later, and you’ll be able to figure out where the leak is.
Storm damage to roofs is a major cause of leaks and this project shows you how to fix these leaks and help to prevent further.
If your tiles have no attachment points for wires, then you could glue something on the back with liquid nails or similar, and attach the wire to that. Isolate areas when you run the hose. Despite sounding extreme, this method yields direct results, enabling you to discern the exact positioning of less visible leaks, and mark them up accordingly. Use torch light inside the roof to highlight the fresh water trail;