Are you from southern Alberta? If so, you know what can happen to shingles. Winds of 100km/h and higher are a reality and shingles are commonly seen laying on front lawns and driveways after storms. Repairs are possible on most asphalt roofs but that's not the only issue that can arise on a sloped roof, there are attic vents, plumbing flashings, goose neck flashings, valley flashings, step flashings, wall metals, turbine vents, skylights, etc. that can fail. Don't fall victim to lack of maintenance, interior damage is costly.