# Ontario Roof Replacement 2026: Shingles, Flat Roofs, Ice Shield and Cost Guide

**URL:** <https://home.renovation.reviews/t/ontario-roof-replacement-2026-shingles-flat-roofs-ice-shield-and-cost-guide/46913>\
**Category:** Ontario\
**Created:** [April 26, 2026, 7:12pm UTC](https://home.renovation.reviews/t/ontario-roof-replacement-2026-shingles-flat-roofs-ice-shield-and-cost-guide/46913 "2026-04-26T19:12:28Z")\
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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, 7:12pm UTC](https://home.renovation.reviews/t/ontario-roof-replacement-2026-shingles-flat-roofs-ice-shield-and-cost-guide/46913/1 "2026-04-26T19:12:28Z")

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Roofing questions come up constantly here — here’s a consolidated Ontario guide for 2026.

**Asphalt shingles (most common):**

- 3-tab largely obsolete; architectural/laminate is the standard (30-50 yr warranties)
- GTA pricing for 1,500-2,000 sq ft home: $8,000-$14,000 including tear-off, new ice and water shield, architectural shingles
- Ice and water shield required from eave to 900mm inside exterior wall line (OBC minimum)

**Flat roofs (common in Toronto Victorian/bungalow stock):**

- Modified bitumen: $10-$15/sq ft, 15-20 yr lifespan
- EPDM rubber: $12-$18/sq ft, 20-30 yr lifespan
- TPO: $12-$16/sq ft, 20-25 yr lifespan

**Attic ventilation** is the most common warranty-voiding issue. OBC requires 1 sq ft unobstructed ventilation per 300 sq ft attic floor. Balanced intake (soffits) to exhaust (ridge) system is optimal.

**Contractor red flags:** Cash only, no written contract, same-day pressure, no local address, no WSIB coverage.

What roofing systems have held up best in your GTA neighbourhood?

_Ontario roofing help at [home.renovation.reviews](https://home.renovation.reviews)_