Ontario • Inland Empire
Roof Replacement in Ontario —
Done as a Complete System
Full residential roof replacement in Ontario — built for older established neighborhoods, newer master-planned subdivisions, and high inland heat.
Get an instant budget estimate in about 60 seconds using aerial roof data — no appointment or sales call required.
Built for Ontario Homes
What Ontario Roofs Actually Deal With
Ontario's housing stock spans original mid-century neighborhoods through new master-planned developments. The older tract roofs are largely past service life; the newer ones increasingly need ventilation upgrades on first replacement. Local material selection, flashing package, and ventilation strategy all matter — a generic SoCal install template doesn't perform the same way in Ontario as it does two counties away.
Wide age range of housing stock — historic to brand new
Sustained inland summer heat and high attic load
Aging 1950s–1980s original-build tract roofs
Newer master-planned subdivisions in Ontario Ranch
Complete Systems
Why Your Ontario Roof Should Be Installed as a System
A roof isn't just shingles. Underlayment, leak barriers, ventilation, flashings, and ridge components all matter — and most failures come from the layers under the shingle, not the shingle itself.
Synthetic Underlayment
Not 30-lb felt. Tear-resistant, water-shedding, and built to outlast the shingle layer.
Leak Barriers Where It Counts
Eaves, valleys, and penetrations — the spots that fail first on basic installs.
Balanced Ventilation
Intake and exhaust matched to actual attic volume — radically extends shingle life.
Premium Flashings
Pipe boots, step flashing, valley metal, ridge — installed to manufacturer spec.
Manufacturer-Matched System
Complete GAF or DaVinci system — what unlocks enhanced warranty coverage.
Full Deck Inspection
Every Westmark project starts with a full tear-off and structural deck inspection.
Get a Real Ontario Roof Estimate in 60 Seconds
Aerial measurements. No salesperson at your door. No pressure.
Why Ontario Homeowners Choose Westmark
Built for Ontario, Not Generic SoCal
Full Tear-Off, Always
We don't shingle over old shingles. Full tear-off lets us inspect deck and underlayment correctly.
Synthetic Underlayment Standard
We don't use 30-lb felt. Synthetic underlayment included on every Ontario project.
Ventilation Re-Engineering
Most original Ontario attics are under-vented. We rebalance intake and exhaust as part of every replacement.
Class A Fire Rating
GAF complete asphalt and DaVinci synthetic both carry Class A — highest available.
Recommended Systems
Best Roofing Systems for Ontario
Most Ontario homeowners choose a complete GAF system — Timberline HDZ or Grand Sequoia. DaVinci is the right call for premium long-tenure homes.
GAF Timberline HDZ
Strongest value. Complete GAF system. GAF Golden Pledge included. Class A fire rated.
GAF Grand Sequoia
Upgraded designer profile. Complete GAF system. GAF Golden Pledge included. Class A fire rated.
DaVinci Synthetic
Premium synthetic shake or slate. Class A fire + Class 4 impact rated. Limited Lifetime Material Warranty.
Process
How It Works
Same calm, professional process on every project — no in-home sales pitch, no high-pressure close.
1. Instant Estimate
Enter your address. Aerial-data ballpark in about 60 seconds.
2. Detailed Quote
Written, line-itemed scope and pricing — by system tier.
3. Schedule + Install
Crew arrives on time. Full tear-off and complete system install. Most projects complete in 1–3 days.
4. Final Walkthrough
We walk the finished roof with you, clean the site fully, and register your manufacturer warranty.
FAQs
Common Questions
Ready to Replace Your Ontario Roof — Done Right the First Time.
Get a fast Ontario roof estimate online, or talk to us directly. We're not the cheapest option — and that's intentional. We focus on full system installs, not quick fixes.
Get an instant budget estimate in about 60 seconds using aerial roof data — no appointment or sales call required.