I see. That makes sense Jaros.
Here's the long version of the story, if you or anyone is interested:
I have recently had a roof added to my deck, turning it into an open-air porch. (The house is two stories with vinyl siding on the back where the deck/porch is). The porch roof was attached to the side of the house with a ledger board. To attach the ledger board, they removed a section of siding, and I think they cut away the foam board too. (There was no wood sheathing/underlayment, just foam board and I think felt paper behind the foam board. As far as I know they left the felt paper, but I'm not positive of that.) A few weeks after the project was done, I learned for the first time that vinyl siding relies on water barrier material behind the vinyl siding to protect the house from rain water. In my case I presume the water barrier was the foam board, and then behind that the felt paper.
They cut away a big rectangular area of the foam board to install the ledger board, so now the water barrier is "breached", and there are second story windows above the ledger board area that will let rain water behind the siding, due to the loose nature of siding. The thing that started me on the path of discovering all this was the fact that when they built the porch roof, they butted the porch roof flashing up against the exterior of the siding instead of putting it behind the siding, and they insisted that was the right way to do it even though I knew it was wrong. (By the way, I screened these guys really well before they did the job, and they seemed really good, so don't think that I just called someone out of the phone book or something.)
So basically there are two issues I have to try to fix. The first is that the flashing should have been put behind the siding. The second is that they should have done something to address the breach in the water barrier caused by the cutting of the foam board.
I'm thinking of trying to get someone to come remove the old piece of porch roof flashing and install one piece of new porch roof flashing that goes behind the siding and also behind the window flanges (the bottom of the windows are close enough to the porch roof to do this, only about 6 inches up from the porch roof), and tape the whole length of the top of the flashing to the foam board (because there is also a little bathroom window up higher that is too high for the flashing to reach to tuck under its flanges, but it will still leak water onto the foam board because it has siding next to it too.) I've seen a little water trickling down the siding under the porch roof during recent rain, so I know something's not right.
What do you think?