What Is a Class 4 Impact-Resistant Roof — and Is It Worth It in San Antonio?
A Class 4 roof uses shingles or panels that have passed the highest rating of the UL 2218 impact test, in which a steel ball is dropped onto the material from a set height without cracking the mat. It is the toughest widely available residential rating, and in a market like San Antonio — which took the costliest hailstorm in Texas history in April 2016 — it is a genuinely reasonable thing to consider rather than an upsell.
What actually drives it
What the rating means
UL 2218 Class 4 is an impact test, not a warranty and not a guarantee. A Class 4 roof can still be damaged by large enough hail.
The insurance angle
Many Texas carriers offer a premium discount for impact-resistant roofing. The amount varies significantly by carrier — ask yours what they allow before you decide, not after.
The cost difference
Class 4 materials cost more up front. In a hail corridor that premium is often recovered through a combination of the discount and not replacing the roof as often.
It is not only shingles
Some metal systems also carry Class 4 ratings, which is worth knowing if you were already weighing metal.
Installation still decides it
A Class 4 shingle installed with poor ventilation and bad flashing is still a roof that fails early. The rating does not rescue the install.
Related: Asphalt Shingle Roofing · Metal Roofing · Hail Damage Roof Repair
Before you call anyone
Frequently Asked Questions
No. It means the material passed a standardised impact test. Large enough hail damages any roof — Class 4 raises the threshold, it does not remove it.
That is entirely carrier-specific and we will not quote you a figure. Call your agent and ask what they allow for a UL 2218 Class 4 roof before you choose your material.
Next step
Talk to a roofer who will give you the real number
No obligation, no pressure, and no push toward work you do not need. If a repair is the right call, that is what we will quote.
Financing available · Warranty-backed work · Serving San Antonio since 2010
Bondoc Roofing
10127 Morocco St #195
San Antonio, TX 78216
Phone
(210) 896-3209
Availability
24/7 for storm and emergency response