What Is Impact-Resistant Shingles?
Impact resistance is graded under UL 2218 by dropping steel balls on shingles: Class 4 (the highest) must survive a 2-inch ball from 20 feet without cracking. In hail-prone Texas, most insurers offer premium credits on the wind/hail portion of the policy for a certified Class 4 roof - commonly in the 10-35 percent range on that portion - and Texas law addresses how these discounts are made available. Because the wind/hail component is often the largest piece of a Central Texas premium, the upgrade (typically $1-$4 more per square foot at install) can pay for itself in premium savings over several years while also reducing the odds of a future claim and the deductible that comes with it. Class 4 does not make a roof hail-proof, and insurers may require certification paperwork from the installing contractor at policy time. Some policies pair discounts with cosmetic-damage exclusions - worth reading before buying.
Important Distinction
Note: Class 3/Class 4 here refers to UL 2218 impact ratings, not to shingle wind ratings (Class F/H) or fire ratings (Class A) - three different scales that homeowners routinely conflate.
Also Known As
These are the search terms and phrases that commonly refer to this topic, so you can find it however you describe it.
How Impact-Resistant Shingles Relates to Other Topics
A Class 4 rating (UL 2218) means a 2-inch steel ball dropped twice from 20 feet did not crack the mat - a fracture test, not cosmetic immunity: Class 4 shingles still lose granules and take marks in real hail.
Many Texas insurers discount premiums for Class 4 shingles, and some pair the discount with a cosmetic-damage exclusion endorsement - so the same upgrade can lower the bill and narrow what a future hail claim covers.
Impact-resistant shingles are almost all architectural-grade: the laminated double layer is part of what absorbs the strike, so the Class 4 conversation usually starts by leaving 3-tab behind anyway.
The Class 4 test grades exactly one thing - whether the mat cracks - which is the same fracture a hail bruise is; the rating is best read as bruise resistance, not as a promise the roof will look untouched after a storm.
Related To Impact-Resistant Shingles
Read a Class 4 shingle's warranty before buying it for hail protection: manufacturers commonly limit or exclude hail damage from coverage on the very lines marketed for impact resistance - the rating speaks to insurers, not the warranty.
Questions about Impact-Resistant Shingles?
Zilker Roofing inspects before recommending. Honest assessment, no pressure.