Roof Leak, no idea how to address this particular problem!
I bought a home to renovate and have found a nasty leak in the home and have no idea how to address it. Below are some pictures of a problem area on a roof where an addition meets the original house. Its a fixer upper for a rental so i have to address this myself. It appears the roof has leaked off and on for years. There are shingles under the tin roof of the addition and i assume they tinned it to try and solve the original leak. I know its more of a water management issue but how to address it i am unsure. I would greatly appreciate your input on how to effectively correct this issue for the long term. Thanks Fred