... asphalt, then covered with high-sof Asphalt roofing felt is processed by making the paper base soaked in low-softening petroleum asphalt, then ... : 0.05-0.10MpaAsphalt felt Breaking Elongation: 240-370NWeight of per rool: 25lb, 30lb, 40lb, 45lb, 50lb, 55lb, 60lb, 70lb etc waterproof paper roofing felt