About 2 years ago my brother and I put another layer of shingles on my mother in laws house, when we did it we replaced the aluminum ridge vent with a RollVent shingle over ridge vent. And She’s been complaining that the house is much hotter in the summer than before we re-did the roof and we also went with a lighter shade of shingle, so I went and checked the attic and I found a lot of black mold/mildew growing on the plywood and even patches of dark stuff in areas of the insulation. So it appears the new ridge vent isn’t providing adequate airflow.
How should I fix this? Rip it up and replace the ridge vent with another aluminum one or something else? ShingleVent II is another shingle over style that claims to have better airflow, but I dont’ know after my first experience with shingle over venting… She wants me to add one of those solar attic fans, but I’m not sure thats the best solution either…HELP, I need ideas.