Mon–Fri: 8:00am – 5:00pm
Back to Blog

Baccaro Roofing GuideSteel vs Shingles for Hurricane Wind: RGV Test Data

May 5, 20266 min read

The Rio Grande Valley sits in active hurricane territory. Cameron County alone has been hit by 30+ named storms since 1900. When you're choosing between steel and shingles, hurricane wind survival is the most important spec — it determines whether your house has a roof after the next Cat 2 lands.

The wind rating numbers

| Material | Wind rating (proper install) | Real-world survival in Cat 2 (~110 mph) | Cat 3 (~130 mph) |
|----------|------------------------------|----------------------------------------|------------------|
| 3-tab asphalt shingles | 60 mph | Tabs lift, courses pull | Severe damage |
| Architectural shingles | 110–130 mph | Mostly intact | Some loss |
| Class 4 architectural | 130 mph | Intact | Mostly intact |
| Stone-coated steel | 120 mph | Intact | Intact |
| Standing-seam metal | 150–180 mph | Untouched | Mostly intact |
| Screw-down metal | 110–140 mph | Intact | Some screw loosening |

Numbers above assume proper installation — 6-nail patterns on shingles, hurricane straps where applicable, 24" max screw spacing on metal.

What "wind rating" actually measures

Manufacturer wind ratings are based on UL-2218 and ASTM D7158 testing in lab conditions. Real hurricane performance depends equally on:

  • Nailing pattern: 4-nail vs 6-nail on shingles is a 30% difference in uplift resistance
  • Sealant strip activation: Self-sealing tabs need ~24 hrs of heat to bond — install during cool/wet conditions and you may have unsealed shingles
  • Edge treatment: Improperly fastened drip edge is the #1 hurricane-damage failure point
  • Underlayment: Synthetic underlayment vs felt — synthetic survives wind-driven rain much better
  • Decking condition: Rotted decking can't hold any fastener

A Class 4 shingle on a poorly-installed roof fails before a 3-tab on a properly installed one.

What we install for hurricane survival

For coastal RGV (Brownsville, Port Isabel, South Padre Island): - Standing-seam metal with stainless fasteners and hurricane straps - WPI-8 windstorm certification

For inland hurricane-exposed RGV (McAllen, Edinburg): - Class 4 architectural shingles with 6-nail pattern - Synthetic underlayment with sealed drip edge - Hurricane-rated ridge cap with extra fastening - Manufacturer warranty registration with hurricane endorsement

The Texas Windstorm Insurance Association (TWIA) requirement

If you're in TWIA territory (most of Cameron County, parts of Willacy), your roof must meet specific construction standards to maintain coverage:

  • WPI-8 windstorm certification on the install
  • Approved roof types only (Class 4 shingles, metal panels, modified bitumen for flat)
  • Inspection by a TWIA-approved inspector after install

Your contractor should know whether your address falls in the WPI-8 zone. Ours does. Ask before you commit.

What about hail?

Hurricane wind isn't the only consideration. RGV hail (golf-ball size or larger):

  • 3-tab shingles: Cracks easily. Total loss after one serious event.
  • Architectural shingles: Damaged but functional after most events.
  • Class 4 shingles: Designed for hail; usually survives without functional damage.
  • Stone-coated steel: Excellent hail performance.
  • Standing-seam metal: Dents but doesn't fail. Cosmetic damage only in most events.
  • Screw-down metal: Same as standing-seam.

For RGV homes that get both hurricanes AND hail, Class 4 shingles or metal are the only real choices.

Common questions

Will my roof survive a Cat 1 hurricane?

If properly installed with Class 4 shingles or metal: yes, with minor cosmetic damage at most. With 3-tab on cheap install: probably no.

Does the wind rating apply to my whole roof?

Only if installed correctly. Critical: 6-nail pattern, sealed underlayment, hurricane straps at eaves, sealed drip edge. Cutting corners on any of these voids the spec.

What's the most likely failure point?

Drip edge and starter strip at the eaves. That's where wind first gets under shingles. Ask your contractor specifically how they install these.

Should I evacuate if a hurricane is coming?

Always follow local emergency orders, regardless of roof. No roof rating beats not being in a flooded house.

Get a hurricane-spec install

(956) 600-0501 for a free on-site evaluation. We'll show you exactly how we install for hurricane survival and give you the wind-rating documentation in writing.

Related reading