My house is a 1979 basic ranch style house and ive always had bad ice problems. After the worst winter we've had in a long time and the ice ripping the gutter and fascia board off my house i'd had enough. I only had R-19 up there added another 30 on top of it and noticed the old insulation was crammed right tight to the sheathing. I always saw that nice big 2 foot vented soffit out front thought it was doin something, guess not. Pulled gutter fascia down just to find the siding guys that did this before i moved in put the vented soffit over the solid wood soffit. Ripped the wood down, slid durovent up the rafter bays.
Question is it seems a ton cooler up there now, is there a temp difference thats needed? I would think anymore than say 10 degree difference would mean i still have to much heat loss and not enough air flow. I know i got enough coming up the rafters but 35' ridge length i just have gable vent on each end. I guess i should just ride it out another year to see how much it helped but its become a mission of mine to never have ice again.