My 1960s-vintage home has a hip roof--no gable to vent and built with no
ridge vent. The roof has a 4/12 pitch. It has ample soffit vents and
eight slant-back vents
spaced out near the ridge line. This works fine in the summer and most
of the time in the winter. However, when a heavy snow buries the vents,
I'll get ice dams if I don't get up on the roof and shovel out the vents.
We'll be installing new shingles this summer, and I'd like to solve the
roof-venting problem at the same time. I've found three possible
solutions so far. They're listed below, starting with the most
expensive. Can anyone suggest other solutions or comment on the likely
effectiveness of the ones I list?
Most expensive: One or two cupola vents.
Moderately expensive: gravity air vents with 12" stack
Thaler Metal Industries
Least expensive, least tall: square-hood vents with 6"-8" stack
Owens Corning VentSure Square Hood Roof Vent with Large Base and Screen,