I’m located in San Diego, CA and recently had my 1945 home re-roofed by a well known and reputable roofing company in the area that is licensed/bonded/insured/OC Preferred contractor etc. The work was just completed and i’ve yet to pay, but I have a few concerns about the workmanship and am wondering if it’s just all in my head.
During the tear off the old plank style wood was exposed and appeared to be in decent condition with few gaps over 1/4" inch and no rotting found. They assured me that a new decking of OSB or plywood was unnecessary despite what i’d read elsewhere. Now that it is completed, I can see the synthetic underlayment through the small gaps in the attic as well as knot holes that weren’t covered over with anything other than the underlayment and shingles.
Additionally, the valleys were fashion in a California Cut style according to the roofer. When I look at them they appear to run directly center with the valley and aren’t particularly well secured to the roof structure. I can lift the top layer up easily exposing the shingles underneath. The bottom layer is secure however. To my mind, water would run underneath the unsecured section penetrating the underside of the shingles. Shouldn’t they have roofing cement or something on them to keep secure?
Finally, there are a few areas where the “SureNail” strip of the Owens Corning TruDefinition Duration shingles are readily visible on the roof as well as a couple exposed nailheads that I can see as well. These are primarily isolated to one small area. I am typically pretty critical of work and am wondering if this is normal workmanship or all in my head. Any advice from the pros around here as to if this is typical or if not, what I should do about it?
Link to pictures: https://imgur.com/a/z2IrD