Showed up on schedule, quickly and efficiently removed old shingles. I needed some sheathing replaced, ( I knew this prior to hiring Alpha) they assessed, brought in the new sheathing and extra labour to have the roof finished ASAP. Did a great job cleaning up. All said and done within 4-5 hours. Impressed to say the least. It was t a difficult shingle job, it nonetheless that were quick, the crew was courteous, they did exactly what they promised, no surprises. Awesome job.