I have a 1906 masonry wall house with a wooden roof and Spanish tiles on it. I live in Rye, NY (around 90 degrees in the summer and 10 in the winter), The attic has 2 windows, one on each side, each about 10 sqft in total and 5sqft of actual airflow space.
It appears to me that there are no soffit vents and no ridge vent. I have done a lot of research on whether or not to use rafter vents (those styrofoam channels that connect the soffit and the ridge) and came to the conclusion that these only make sense if there are soffit and ridge vents, which isn't the case. So I have begun insulating with R-38 faced fiberglass and wanted to put a vapor retarder on once the insulation is complete and finish with sheetrock. But I am now second guessing my conclusion of not putting the rafter vents in. Any help would be greatly appreciated.