We have had our siding replaced about 3-4 times after we first bought our home (2006) due to a builder problem. I noticed at the time that the contractors were not replacing the Tyvek (or the sort), just taping it (and not well I might add).

Anyway, all of a sudden we have these white marks in our living room and master bedroom (approx. 3 years after the last replacement). It is also only where we have the vaulted ceilings. Does anyone have any idea what it could be?

BTW, we have not been in the attic, but it looks like it may be water damage. I am starting to really worry that this will be an expensive fix!