Roofing Shingles for an Ontario House: Types, Real Lifespans, What the Code Requires Under Them, and When Metal Wins

Almost every new Ontario house gets asphalt shingles: 3-tab (cheapest, flat pattern, 15 to 20 years here), architectural or laminate (the standard, thicker, 20 to 30 years), or premium designer (heavier, 25 to 35 years). Real life depends more on attic ventilation, slope, sun exposure and installati


















