I have no headwall flashing that I can see, the contractor installed the cedar siding all the way down to the shingle, the roof isn't that old and now I am getting water which seems to be coming from that area of the roof all the way down to the gutter. I had another contractor look at it while he was there doing a different job and he had his guys put a tar membrane coated with tar along the headwall. That didn't fix it, I also have a skylight about 2ft lower at that spot in the roof, but the sheet rock is pealing a good 6-10 inches above it which is why I suspect the headwall flashing. I had another roofing guy look at it and he wanted 10K to fix it, thats alot of cash I can't part with! Can I put some aluminum flashing along that headwall without taking off the cedar siding? Thanks in advance!