I am considering replacing my roof. A metal roofing rep came to my house and inspected my attic areas. He used a meter to indicate moisture and in some cases his meter indicated that the mositure content in my attic insulation was high enough to promote mold growth. The moisture levels were attributed to the fact that I had installed platic wrapped fiberglass insulation. The high moisture was only found in one attic area which makes me believe that the insulation was not the cause as both sides have the added insulation. There are no indications of leaks in my attic, my roof asphalt shingles iare20 yrs old. The side with moisture has a bird nest that blocks in part the vent on the side of the house. The attic does not have a ridge vent but does have vent boxes below the ridge. Is there a criteria for measuring moisture content and at what level will mold become a problem?
