I don't need roof mounted Bathroom fan vents.

The majority of bathroom fans in our area vent directly into the attic, or else into, but not through the soffit on the eaves. Many clients want to know, "Hey it wasn't an issue so far, what is the big deal?" Many times the mold and deck issues are not visibly in a place the homeowner can see, or in close connection with the results it brings. With a good ridge vent, it is much less noticeable. However as the house ages it tends to cut dramatically into the life of the roof and decking. As OSB softens, plywood warps, or delaminates, it causes ponding and nail pops. Since the outside temperature is often colder then the attic in the winter time, and warmer air holds more moisture at the same relative humidity, that extra moisture in the attic comes into contact with the cold nails, this moisture condensates on the cold nails and freezes as temperature drops. This cycle over the years deteriorates the material holding the nail, pushing the nail up with the help of thermal expansion, leading to nail pops. The other issue is often mold build up, which happens slowly as the house ages. I have attached several pictures to show some of our findings. In the first photo you see what has happened on two client's roof decks after 40 years of, "oh, they are vented into the soffit" kind of thinking. The soffit happens to be the INTAKE vent, If the ventilation system is working PROPERLY, all that moisture comes right back in, as you can see by the mold streak up the roof deck.