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Class 4 Impact-Resistant Shingles — Oklahoma's Best Defense Against Hail

If you live in Oklahoma, you live in Hail Alley. Tulsa County averages 3–5 significant hail events per year with stones exceeding 1 inch in diameter. The April 28, 2021 hail storm alone produced 3-inch hailstones across midtown Tulsa, causing over $800 million in insured losses. Standard Class 1 or 2 asphalt shingles can't withstand this abuse — they crack, lose granules, and fail years early. That's where Class 4 impact-resistant shingles come in. Rated to withstand a 2-inch steel ball dropped from 20 feet (UL 2218 Class 4 standard), these shingles reduce hail damage by 60–70% compared to standard shingles — and many Oklahoma insurers offer premium discounts of 15–35% for homes with Class 4 roofs.

Proof Construction installs Owens Corning Duration FLEX Class 4 shingles — a polymer-modified asphalt shingle with SBS (styrene-butadiene-styrene) rubberized polymer that flexes on impact instead of cracking. Unlike standard oxidized asphalt that becomes brittle with age, SBS-modified shingles maintain impact resistance throughout their service life. We pair them with Owens Corning WeatherLock Flex synthetic underlayment (self-sealing around fasteners), ice and water shield at eaves and valleys per IRC 2018, and a 6-nail high-wind installation pattern rated to 130 mph. This system qualifies for the Owens Corning Platinum Protection Warranty: 50 years non-prorated coverage on materials, plus 25 years on workmanship.

Is Class 4 worth the upgrade in Oklahoma? The math: a standard architectural shingle roof on an 1,800 sq ft Tulsa home costs $11,000–$13,500. Upgrading to Class 4 adds $1,200–$1,800. With a 25% annual insurance premium discount on a $2,400/year homeowner's policy, that's $600/year in savings — paying back the upgrade in 2–3 years. Over the 30-year expected life of the roof, you save $15,000+ in insurance premiums alone — plus the avoided cost of 1–2 premature replacements from hail damage. Proof Construction provides free Class 4 consultations including insurance discount verification with your carrier. Call (918) 734-4444 to see your roof qualify.