Originally Posted By: aslimack
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Sure looks to me like inadequate ventilation. If the soffit venting is blocked as you say, no question thats where i’d be looking. No inlet air is certainly going to limit the ventilation. This is what will happen. Also, if that insulation doesn’t have a vapor barrier, that could also contribute. Look to see if the discoloration is darker over the bathroom or kitchen. This may also give you a clue.
Though the color doesn't look extensive, i'd advise taking a screwdriver up with you and poke around just to be sure the rafters and deck aren't rotted/rotting. I've seen whole 10 year old roofs that had to be torn off and the structure and deck replaced due to blocked soffit vents. Sometimes this will be reflected by excessive dips in the roof, notable from the outside. Many roofers and siders have a very limited understanding of the dynamics of ventilation.
Side note: If it were me and the deck and structure are sound as they appear, i'd be using an old broomstick with a notch cut out to hold a baffle snuggly in it. I'd go around the attic with a stack of baffles cut in half to 2 ft. lengths. I'd stick the baffles into the soffits and give the broomstick a little twist if needed, to release the baffle from the stick. Saves the back and knees, and maybe the ceiling below.
Adam, A Plus