My house is 15 years old. I have soffit vents and had aluminum ridge vents. For the last 15 years the ventilation seemed fine. We had hail damage and just got new shingles and ridge vents installed. Now I have owens corning ventsure ridgid roll ridge vents. My attic has been getting so much moisture building up I now have a bunch of stains on my ceilings. Everything is soaked in the attic. It is winter and has been snowing (I’m in Pennsylvania) so the ridge vent has been blocked some. I have R49 insulation and baffles in the overhangs to keep the insulation from blocking the soffit vents. I can see the soffit vents aren’t blocked. The house must be insulated good, I never have any ice dams. Would some sort of attic fan help? I need to do something. The attic will not stay dry. Everything I read says I have the best setup for ventilation. But it’s not working.
The underlayment may not have been cut out of the ventilation slot.
The aluminum style ridgevents function pretty well, the gun nailable roll vents have less free area per ft so they don’t vent as well.
You may be able to see from the attic if the underlayment is cut away.
It is cut away. I can see the mesh on the bottom of the ridge vent.
Not saying you are wrong but how do you know it’s the mesh on the ridgevent as opposed to the underlayment, they can look the same.
Like I said the gun nailable ridgevents are only 5/8" tall as opposed to 1" tall for the 4’ sections that require hand nailing with 2 1/2" nails or better, this is a 37.5% difference.
If everything was functional before and the ridge is cut open I would suggest removing the roll vent and replacing it with a product like shinglevent II or Snow Country, these are 4’ sections with more net free area.
They do not look the same. It has titanium underlayment. I have a small piece of the ridge vent left over and I looked at the bottom of it. It just seems to not flow much air. I was considering a different ridge vent.
We always use shing vent ll or equivalent. Roll vents are not very effective new and break down over time and become even less effective.