$200K Water Damage From One Missing Roof Calculation

Added: 2026-05-21

[00:00:00]Did you know that one missing drainage calculation cost a Chicago warehouse owner over $200,000 in water damage? The contractor installed a beautiful new roof, but completely ignored the square inch per square foot drainage ratio.

[00:00:12]When that first heavy storm hit, water had nowhere to go. The roof became a swimming pool, then collapsed into the building below. Most contractors skip this critical calculation because it requires actual engineering work, not just guesswork. At North Star Roofing Systems, we run every drainage calculation before we even quote your project. Call us at 773-318-8854.