The roof built for here.
Class 4 shingles are tested by dropping a two-inch steel ball on them. In Tornado Alley, that’s not a lab exercise.
What the rating means
UL 2218 tests shingles by dropping steel balls of increasing size onto them. Class 4 is the top rating: the shingle survives a two-inch ball dropped twice in the same spot without cracking. Most standard shingles aren’t rated at all.
Insurance discounts
Many Oklahoma insurers offer a premium discount for a Class 3 or Class 4 roof, and state law requires insurers to offer one when it’s actuarially justified. The discount varies widely by company. Call your agent before you choose; we’ll give you the certificate they ask for.
What it won’t do
No shingle is hail-proof. Baseball hail can still damage a Class 4 roof. But it holds up far better to the quarter- and golf-ball hail that falls here most years.
Replacing anyway? Ask about Class 4.
The storm roofing site, built in seven days.
Sixteen pages: a hail-size guide, the insurance claim walked through step by step, a page on spotting storm chasers, and the Oklahoma registration number on every screen.