I live in the north east (NJ) and have a recurring mold problem in my attic. I replaced the roof (plywood & shingles) 3 years ago and added soffit & ridge vents but the mold keeps coming back and getting worse. The roof is a typical gable contruction with with a northern and southern exposure. The mold is only growing on the roof plywood on the northern face. The entire southern section is clear of mold. I thought the installation of soffit and ridge vents would mitigate this problem. I also tried plugging up other interior cracks/ holes in the interior space that lead to the attic... Not sure what to do???