A Benefit-Cost Analysis of Impact-Resistant Asphalt Shingle Roofing--Presentation Public Deposited
The Institute for Catastrophic Loss Reduction creates and disseminates disaster resilience knowledge for Canada. Among the catastrophes ICLR addresses are hailstorms, one of Canada’s most serious natural hazards. Hail costs $400 million annually. A June 2020 hailstorm at the edge of Calgary damaged 77,000 homes and cost $1.4 billion. Much of that money paid for roof repairs. A direct hit on Calgary could be 5 to 10 times worse. Though the hailstorm is inevitable, the catastrophe is not. Using impact-resistant asphalt shingle roofs instead of standard shingles adds $3,400 to the cost of an average-sixed roof, but saves up to 8 times as much, reduces the chance of damage by 15 times and the cost if damage does occur by half. In Calgary, the shingles pay for themselves in 5 years. Benefits and costs scale with roof size and location matters. The shingles make financial sense anywhere it hails at least once a year on average. Places with more-frequent hailstorms see more benefit; less-frequent, less benefit.
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