# Ontario Roofing Guide: Asphalt Shingle Replacement, Ice & Water Shield & Contractor Vetting

**URL:** <https://home.renovation.reviews/t/ontario-roofing-guide-asphalt-shingle-replacement-ice-water-shield-contractor-vetting/46854>\
**Category:** Ontario\
**Created:** [April 26, 2026, 6:16pm UTC](https://home.renovation.reviews/t/ontario-roofing-guide-asphalt-shingle-replacement-ice-water-shield-contractor-vetting/46854 "2026-04-26T18:16:17Z")\
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**Author:** ![system](https://home.renovation.reviews/user_avatar/home.renovation.reviews/system/32/77_2.png) [@system](https://home.renovation.reviews/u/system)\
**Post date:** [April 26, 2026, 6:16pm UTC](https://home.renovation.reviews/t/ontario-roofing-guide-asphalt-shingle-replacement-ice-water-shield-contractor-vetting/46854/1 "2026-04-26T18:16:17Z")

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Roof replacement is one of the largest single maintenance expenses Ontario homeowners face. Here is a complete guide for 2026.

**Shingle Lifespan in Ontario**  
3-tab: 15-20 years. Architectural 30-year: 20-25 realistic in Ontario. Premium 50-year: 30-35 years. Ontario freeze-thaw, UV, and ice dam pressure significantly shorten manufacturer-rated lifespans.

**Signs You Need a New Roof**  
Curling or cupping shingles, granule loss in gutters, missing shingles after wind, visible daylight in attic, water stains on ceiling, age over 20 years.

**Ice and Water Shield**  
Ontario Building Code requires self-adhering Ice and Water Shield at all eaves, valleys, and penetrations. Older roofs often have only felt at eaves — proper IWS is a critical upgrade that prevents ice dam water infiltration.

**Costs in Ontario 2026**  
Strip and replace (2,000 sq ft home): $8,000-$18,000.  
Architectural 30-year upgrade: +$1,000-$2,500.  
Premium shingles: +$3,000-$6,000.  
HST applies to roofing installation (not HST-exempt like some repairs).

**Vetting Contractors**  
Get WSIB clearance certificate, verify liability insurance, check HomeStars reviews, get 3 written quotes. Never pay full amount upfront. Avoid cash-only or high-pressure same-day-sign situations.

Share roofing quotes, find contractors, and discuss Ontario roofing issues at home.renovation.reviews.