Need help with a mold issue coming back after complete remodel. A double roof issue I believe. New roof installed over old roof and closed cell spray foamed house. – GreenBuildingAdvisor

Hello All. I am beside myself. I will try to explain this so it is understandable. We just did a complete remodel down to studs on our home. We did not re-do the metal roof because it was just done by the previous owner. The old owners had the new metal roof installed, and they put the new roof on top of an old existing roof that had not been removed. It is almost like they built a whole roof with 2-4’s and all on top of the old roof. Pictures provided.

There are still air vents, the little round holes with screens over them that go all the way around the house for the old roof to vent.

We had the entire house sprayed with closed-cell foam. The walls and ceiling were sprayed with the closed-cell foam from inside.

Recently, mold has shown up, and I cannot figure out why. Is it because of the old window that needs replacing (which it does not seem to be the case) or is it because of the new roof being put directly on top of the old roof that created a gap there and that the vents need to be sealed off now because of the spray foam, or do these vents need to open and I need to open them more to get more ventalation in the inbetween area that now exist because of the way they put the new roof right on top of the old roof. I have found that the mold is concentrated just on the top header board that runs the length of the top of the wall, if that makes sense. I have not found mold down in the walls yet, this is why I do not think it is the actual old window, but I am not sure. I cannot wrap my mind around how a new roof is installed over an old one.. Please, any help. I am adding pictures to show the mold concentration area, the gap area from the old roof to the new roof, and the ventilation holes.