This breakdown covers a complete asphalt shingle roof replacement on a 1985-built two-storey home in Gloucester. The existing roof had original 20-year shingles that were 35+ years old — well past their expected lifespan. Several shingles were missing, flashing was deteriorated around the chimney and vents, and there were signs of water intrusion in the attic. Project scope: Complete tear-off of existing roof, inspection and repair of sheathing, installation of new ice and water shield, underla...
Tear-off and disposal: $2,200 — Removal of existing shingles and underlayment from 18 squares. Includes dumpster rental and disposal fees. One layer removed (single-layer roofs are simpler; multi-layer tear-offs cost more). Sheathing repair: $800 — Replacement of 6 sheets of plywood sheathing (4x8) where original sheathing had water damage or rot. This was less than expected — only 5% of the sheathing needed replacement. Ice and water shield: $1,100 — Self-adhering waterproof membrane installe...
GAF Timberline HDZ was chosen for several reasons. The architectural design creates a dimensional look superior to flat 3-tab shingles. The HDZ wind rating (130 mph) exceeds Ottawa's wind load requirements. The algae-resistant granules prevent black streaking common on Ottawa roofs in humid areas. Charcoal was the chosen colour — the most popular roofing colour in Gloucester and Ottawa generally. Dark colours hide algae and weathering better than lighter shades and complement most exterior colo...
Day 1: The crew of 5 arrived at 7 AM. Tear-off of the existing roof was completed by noon. Afternoon was spent inspecting and repairing sheathing, installing ice and water shield at eaves and valleys, and laying synthetic underlayment across the entire roof. Day 2: Shingle installation began at 7 AM, starting from the eaves and working up. Flashing was installed as the crew reached the chimney and penetrations. Ridge vent and hip/ridge shingles were the final elements, completed by 3 PM. Cleanu...
Several factors can significantly change roofing costs in Ottawa: Roof complexity: Simple gable roofs cost less per square than complex hip roofs with dormers, valleys, and multiple penetrations. A complex roof may cost 20–40% more. Multiple layers: Removing 2 or 3 layers of existing shingles adds $1,000–$3,000 to tear-off costs. Sheathing condition: If more than 10–15% of sheathing needs replacement, costs increase by $1,000–$5,000. Extensive rot may indicate ventilation or water intrusion p...
Yes, $13,500 for an 18-square (1,800 sq ft) asphalt roof replacement with quality architectural shingles is competitive for Ottawa. Per square, that's $750 — within the typical $650–$850 range for mid-range asphalt.
Quality architectural shingles (GAF, CertainTeed, IKO) last 25–30 years in Ottawa's climate. Metal roofs last 40–60 years. The key factors are proper ventilation, ice and water shield at eaves, and quality installation.
Late spring through early fall (May–October) offers the best conditions. Shingles need warm temperatures to seal properly. However, emergency repairs can be done year-round, and some contractors offer off-season discounts.
Yes, a building permit is typically required for roof replacement in Ottawa. The fee is based on project value. Your contractor should handle the permit application as part of the project.
Proper installation of ice and water shield at eaves (6 feet from edge minimum), adequate attic insulation (R-60), and balanced ventilation (soffit intake + ridge vent exhaust) are the three keys to ice dam prevention.