Our home only has a 3” wide soffit. As a result, the venting is very poor. We have a massive mold problem in the attic on the rafters and underside of the roof decking, but only on one side of the house (it is a gable roof). Only the front side has this problem (it faces west). What are your suggestions?
Definitely sounds like a ventilation problem. Instead of moving the air from the soffit to the ridge and continuing that exchange, pockets of moist air are getting trapped. Since only one side is getting the mold, it sounds like it may be a side that is under more shade throughout the day. That will create a temperature difference on the underside of the decking and, as a result, the moisture in the trapped air is condensating more readily on that inside slope. Since you only have 3” soffits, unless you can increase the amount of open holes for venting, you’ll need to resort to mechanical help. Attic ventilation fans would help move that moist air out of the attic without giving it time to find a home on the rafters and decking. These fans can be hard-wired into place with an automatic cut-on as determined by temperature. You can also install solar-powered attic fans, although my experience has been that most solar models aren’t powerful enough to be very effective.
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