Terry's Tips are personal observations based on my experience and seeing the cause and effects of things. There may be many ways to address different problems and all opinions are welcome. I am always open to suggestions and certainly want you to correct me on any mistakes that might be written.
If you look and listen to your house, it will talk to you. Are you listening?
Here is a common problem we see when a second layer of shingles is installed over top the first . There is suppose to be an air space between the bottom edge of the siding and the roof. Here the siding is in direct contact with the roof. This causes moisture to wick up the endgrain by capillary action. We can see by the staining that this is taking place. That moisture is actually being sucked up about 8 - 10 inches. This will eventually cause decay and the boards will start to split. Once this happens water will have the opportunity to get in behind the step flashing and cause a leak.