I have to re-shingle a valley in North Carolina. It had metal flashing, rusted with some rusted through holes lower down, with ants and damp felt underneath and on top too (under shingles). The metal was not pressed into a “V” but was curved. The valley shingles were woven, with many single tabs in the valley (despite all this, sheathing boards in the valley are still fine).
So far I have only stripped this valley 3/4 up, from there to the ridge it is intact and I haven’t decided whether to strip the rest.
The gable side of the valley has a steeper pitch than the eave side, so if woven, the 3 tab shingles would not meet one on one, ratio appears to be 5 on steeper roof would meet 6 on less steep roof. Is it even possible to weave this valley?