Don'' t Fall Short on Tiles: How to Quote Materials for Roof Covering Projects
https://www.pure-bookmark.win/cost-to-shingle-a-roofing-system-calculator
Larger laminated roof shingles and also three-tabbed shingles require four, or occasionally five, bundles to cover a square. There are 29 standard-sized roof shingles (12 in when roof shingles come three bundles