Had a new house built last summer and specified a ridge vent be installed. When my inspector did the final inspection, we could not see any light at all when looking up from inside the attic. He got up and inspected the vent and found that is filled with a very dense black foam. I suspect this is to keep critters out but would think it would seriously impede airflow and make the vent almost non-functional. I’ve had ridge vents before and never have seen anything like this. I checked the one sold at the local big box and it had no such filler foam and only a mesh screen to keep bugs and critters out.
An informal check of the attic temp followed, it was a sunny day in the mid to upper 80’s and the inspectors laser temp gun showed 128 degrees at the top of the ridge. I also have TechShield roof decking. We checked the house next door, which had cans instead of a ridge vent (no TechShield) and the temp at the top was about 140. So, I am getting “some” advantage but think it should be more than 12 degrees with a ridge vent and TechShield. Soffit venting is adequate.
Might it be worthwhile to have a roofer come out and replace this ridge vent with something less restrictive — any thoughts, roofing pros??