Texas gets hail. A lot of it. NOAA puts the south-central U.S. among the most hail-active regions in the country, and San Antonio is right in that zone. Spring storms don’t ask for permission. What changes is how much damage you end up with, and that often comes down to what’s sitting on top of your house before the storm arrives: Class 4 impact-resistant shingles in San Antonio or the standard product that came with the house.
The rating system most people have never heard of
There’s a test called UL 2218. It’s how the roofing industry measures impact resistance. Steel balls of different sizes get dropped onto shingles from specific heights. The scale goes from Class 1 to Class 4.
Class 4 is the top rating. It’s a genuinely hard test to pass. A 2-inch steel ball, dropped from a defined height, has to hit the shingle without cracking or splitting it. A lot of products don’t make it.
Most homes in Central Texas were built with Class 1 or Class 2 shingles. That handles light stuff just fine. But golf-ball-sized hail, which isn’t unusual in this part of Texas, punches through them fast. Granules go. The asphalt underneath starts breaking down. Eventually water finds a way in, and by then the damage is already done.
What Class 4 actually means in practice
These shingles are built to flex instead of crack. Some manufacturers use a rubberized asphalt formula. Others weave a reinforcing layer into the nail zone or add a polymer backing that absorbs impact before it reaches the shingle surface.
The result is a product that holds up better against hail, performs better in high winds, and handles Texas temperature swings more reliably. All three of those things matter here.
And there’s the insurance angle. A lot of carriers discount premiums when you upgrade to Class 4. It’s not guaranteed, so check with your agent. But over several years, that discount can offset a real chunk of the upgrade cost.
The shingle is only part of it
Here’s what some contractors won’t bring up on their own. If the underlayment isn’t right, or the flashing around your chimneys and vents was done sloppily, a Class 4 shingle still lets water in. The product doesn’t fix a bad installation underneath it.
San Antonio roofing experts certified by Owens Corning, Malarkey, GAF, and Atlas are held to installation standards those manufacturers actually enforce. That matters as much as the shingle you pick.
Worth checking before the next storm
If your roof is more than 10 years old, or if you know hail has come through your neighborhood in the last year or two, get it looked at. Damage that’s invisible from the ground right now can turn into a real problem by next summer.
When it is time to replace, Class 4 is the upgrade that makes sense for Central Texas. Hail season comes back every year. Your shingles should be built for it.