... processed by making the paper base soaked in low-softening petroleum asphalt, then covered with high-sof Asphalt roofing felt is ... the paper base soaked in low-softening petroleum asphalt, then covered with high-softening petroleum asphalt, and last coated with isolating material ... rool: 25lb, 30lb, 40lb, 45lb, 50lb, 55lb, 60lb, 70lb etc petroleum asphalt roofing felt