“We are extremely satisfied with Atrium Roofing and truly grateful for their outstanding service! After the recent storm, we were in a hurry to have our roof inspected and repaired, and they went above and beyond by accommodating us over the weekend in the Kirby/Converse area. Their team was professional and responsive. They took the time to explain the condition of our roof and provide us with all the details we needed to understand the situation and our options. Their willingness to help us on short notice gave us great peace of mind during a stressful time. We sincerely appreciate their time, professionalism, and dedication to their customers. We highly recommend Atrium Roofing to anyone looking for reliable, knowledgeable, and professional roofing services. Thank you for your excellent service!”
STORMLOCK™ Class 4 Roofing, Engineered for Central Texas
4.9 on Google · 317 reviewsThe Class 4 shingle engineered to resist cracking. Rubberized, polymer-modified asphalt from Owens Corning, GAF, Malarkey or Atlas, installed as a complete engineered system for San Antonio's heat, hail and daily temperature swings.
Owens Corning Platinum Preferred
Owens Corning Product Excellence Award, 8 years running (2019–2026)
GAF Master Elite® Contractor
TAMKO Pro Platinum
Atlas PRO+ Gold Select
Malarkey Emerald Pro
A+ Rated by BBB
Google Verified
Yelp Guaranteed
Yelp · 4.8★ · 75 reviews
GuildQuality · 100% Would Recommend
Nextdoor Neighborhood Fave 2021 and 2025
If your roof is cracking or shedding granules, start here.
STORMLOCK™ is for homeowners who have seen cracked, brittle shingles or granule loss on their current roof and want a Class 4 roof whose shingle is engineered to resist cracking. It is also a sensible option for homeowners whose carriers document a Class 4 roof for wind-and-hail premium discounts. If you are comparing the two Class 4 paths Atrium offers, see the full comparison on our roofing systems page. More detail lives on our IMPACTSHIELD™ system page and in our Class 3 vs Class 4 article. The rest of the range is FOUNDATION™ at the Class 3 baseline, LEGACY™ for hail-specific engineering, and THERMALGUARD™ for energy performance.
Why the material path matters in this climate
San Antonio and the surrounding Hill Country do not just get hail. They get thermal cycling (hot attic, cool rain, rapid temperature swings), and that repeated stress can make a stiffer shingle crack before a large hailstone ever arrives. Modified, rubberized asphalt is engineered to resist that cracking better than a more conventional asphalt might. On the three SBS-modified options, the SBS keeps the shingle flexible enough to absorb that movement. That is the practical advantage homeowners notice: not a higher UL number, but a shingle that holds together under the kind of daily wear that comes with the climate.
Class 4 is still Class 4. Both STORMLOCK™ and IMPACTSHIELD™ cap at the same UL 2218 tier because the standard does not go higher. The difference is the engineering behavior underneath the rating. For homeowners who have had a prior roof fail by cracking, granular loss, or brittle fatigue rather than by a single catastrophic puncture, the rubberized-asphalt path is often the more relevant upgrade.
What we will not say is that any Class 4 roof is hail-proof. The manufacturers' own disclaimers are clear that lab impact testing does not perfectly correlate with real-world hail. Class 4 is the top impact tier UL 2218 assigns. It is not immunity.
Class 4 through the asphalt itself, not an added layer.
STORMLOCK™ is what FOUNDATION™ becomes when the shingle steps up to Class 4 through SBS-modified or polymer-modified rubberized asphalt.
Every Atrium engineered system is specified as a whole assembly, not a shingle. STORMLOCK™ keeps that same structure: underlayment, ice and water barrier, starter course, flashings, matching same-manufacturer ridge, and balanced attic ventilation. What changes is the impact-rated shingle, and specifically how that shingle earns its Class 4 rating.
Some Class 4 products use an enhanced backing layer or a stronger mat. The STORMLOCK™ representative products use SBS-modified or polymer-modified asphalt (essentially rubberized asphalt) to give the shingle more resilience under repeated hail and thermal cycling. That is a real materials difference, not a marketing claim. We state it plainly because homeowners who have watched a prior roof crack or lose granules under Central Texas hail often care about that behavior, not just the lab rating.
| System | Material path | UL 2218 class | Warranty ceiling |
|---|---|---|---|
| STORMLOCK™ | SBS- or polymer-modified rubberized asphalt shingle | Class 4 | Owens Corning Platinum Protection warranty, available only at Platinum Preferred standing, GAF Golden Pledge® Limited Warranty, Malarkey Certified Pro Warranty, available at Emerald Pro standing, or Atlas Signature Select Roofing System Limited Warranty, available at PRO+ Gold Select standing |
| IMPACTSHIELD™ | Backing-layer or reinforced mat shingle | Class 4 | Owens Corning Platinum Protection warranty, available only at Platinum Preferred standing, GAF Golden Pledge® Limited Warranty, or Malarkey Certified Pro Warranty, available at Emerald Pro standing |
What a STORMLOCK™ roof is made of
This is a representative configuration, not a fixed spec sheet. Component selection varies by project, and the exact list is written on your proposal before anything is ordered.
The primary roof covering is a UL 2218 Class 4 impact-rated shingle built with SBS-modified or polymer-modified (rubberized) asphalt. Representative options are Owens Corning Duration FLEX, GAF Timberline ArmorShield II and Malarkey Legacy, which use SBS-modified asphalt, and two Atlas shingles: Pinnacle Impact, which Atlas builds with a polymer-modified asphalt blend, and StormMaster Shake, built with Atlas's Core4 polymer-modified asphalt. All five are independently UL 2218 Class 4 rated per their manufacturers' current product literature, and all achieve their rating through the modified asphalt itself rather than an added backing or mat layer.
Same-manufacturer hip and ridge, not a cut-up field shingle. It is part of the component minimum a manufacturer requires before it will register an enhanced system warranty, and it is standard on every Atrium engineered system.
Standard ventilation, balanced intake and exhaust sized to code, is included in the replacement price. Enhanced ventilation, such as solar or powered attic fans or added intake beyond the standard design, is quoted separately.
Underlayment, ice and water barrier, starter course, and flashings follow the same five-layer system described in “The system, not the shingle” on our roof replacement page. Same layers, same standards: STORMLOCK™ does not change them.
The GAF Timberline ArmorShield II and Malarkey Legacy options in STORMLOCK™ can also serve as eligible components toward an IBHS FORTIFIED Roof™ requirement at the shingle level. Full FORTIFIED Roof certification is a separate process that evaluates the whole roof assembly and requires an IBHS-recognized inspection; we do not represent that every STORMLOCK™ install goes through that full certification.
Colors for this system
41 colors across 5 shingle lines from Owens Corning, GAF, Malarkey and Atlas. The color comes last: we choose the system and manufacturer first, then the line, then the color.
Price a STORMLOCK™ roof from your address
We measure your roof from aerial imagery and apply the STORMLOCK™ per-square rate. No email or phone number needed to see the number.
Your estimate
Enter the property address. We return roof area in squares, including waste, and the installed cost range that area implies at our published rates. Nothing is gated behind a contact form.
What the rubberized-asphalt path actually costs, and earns back
The STORMLOCK™ premium over FOUNDATION™ is a bounded, published number. The discount side depends on your carrier, so here's the math, not a promise.
vs. FOUNDATION™, our Class 3 baseline, for a typical San Antonio single-family roof.
Many carriers offer a wind-and-hail discount for a documented Class 4 roof — amount depends entirely on your carrier and policy. See how the paperwork works.
the top tier Underwriters Laboratories assigns.
What this roof could be worth to you — in your numbers
Enter numbers from your own policy. This is an illustration, not a forecast.
Enter yours from your policy.
Use the wind/hail line, not the all-peril line. Many Texas policies list it as a percentage.
Ask your agent for this in writing. This page covers a Class 4 roof.
Ask about a cosmetic damage exclusion. Some carriers apply one to roofs that receive an impact-resistant credit. It generally means they will not pay for hail marks that change how the roof looks but not how it performs. Ask your agent, and get the answer in writing before you decide.
Each replacement paid through insurance costs you one deductible. Pick the scenario you want to see.
Starting value is an illustration. Use your roofer's quote.
Enter your dwelling coverage and wind/hail deductible above.
Enter your agent's quote above to see this.
Pick how many replacements to model above.
Premium savings from the discount you entered, plus skipped deductibles from the scenario you picked.
Ask about a cosmetic damage exclusion. Some carriers apply one to roofs that receive an impact-resistant credit. It generally means they will not pay for hail marks that change how the roof looks but not how it performs. Ask your agent, and get the answer in writing before you decide.
What this leaves out
- Roof prices that rise over time.
- How filing claims can affect your premium.
- Anything your policy does not cover.
- Rules that are specific to your carrier.
Class 4 impact-resistant shingles can qualify for a premium discount in Texas. The amount is set by your insurance carrier, so ask your agent what yours would be.
Why roof age changes what insurance pays
A $10,000 roof on a house insured for $200,000 with a 2% ($4,000) deductible:
| Roof age | Roof's value | Minus deductible | Policy pays |
|---|---|---|---|
| 5 years | $8,500 | −$4,000 | $4,500 |
| 10 years | $7,000 | −$4,000 | $3,000 |
| 20 years | $4,000 | −$4,000 | $0 |
Source: Texas Department of Insurance example, as published by TDI.
On actual-cash-value policies, payments fall as the roof gets older. Some policies use a roof payment schedule instead, and that varies by carrier. A new roof starts at age zero.
How to claim a credit
- At closeout, you get the impact-resistant certification when it applies to your system. See the Power Package.
- Send it to your agent. Ask them to apply the credit in writing.
- Ask the cosmetic-exclusion question before you sign anything.
What the Class 4 test actually is
To earn a Class 4 rating, a shingle has to survive UL 2218's steel ball test: a 2-inch solid steel ball dropped from 20 feet, twice on the same spot. The shingle passes if there's no cracking, tearing, or rupture on the underside — UL 2218 measures functional damage, not cosmetic appearance.
All five representative options, Owens Corning Duration FLEX, GAF Timberline ArmorShield II, Malarkey Legacy, Atlas Pinnacle Impact and Atlas StormMaster Shake, reach Class 4 through modified, rubberized asphalt built into the shingle itself, not an added backing layer or reinforced mat. The first three use SBS-modified asphalt; the two Atlas shingles use Atlas's own polymer-modified asphalt (Core4 Technology on StormMaster Shake). Either way, the asphalt does the work on every STORMLOCK™ option.The impact-resistant certification your carrier needs to apply a discount is one of the documents in your Power Package, ready to give to your agent.
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0% APR financing for up to 12 months. Or spread the cost over fixed monthly payments of 60 to 180 months. Financing is subject to credit approval. The terms shown here are examples, and your actual rate, term, and payment depend on the lender's decision.
The manufacturer's warranty first. Ours underneath it.
A manufacturer-backed system warranty ranks above any contractor's own warranty for one reason: it survives the contractor. If a roofing company closes, changes hands, or simply stops answering the phone, a warranty backed by Owens Corning or GAF is still honored. A contractor's warranty is only worth as much as the contractor still being in business, and that is as true of ours as it is of anyone's.
Atrium holds Owens Corning Platinum Preferred, the top tier of the Owens Corning contractor network, which makes the enhanced Owens Corning system warranty available on our installs. Atrium is also a GAF Master Elite® Contractor, the only GAF certification tier that can offer the GAF Golden Pledge® Limited Warranty. These system warranties cover material and, at these tiers, workmanship, and they are registered with the manufacturer in your name.
For the Owens Corning, Malarkey and Atlas options, these are contractor-certification-tier warranties, so the ceiling available does not change because the engineering path to Class 4 is different. GAF is different: Under GAF's Golden Pledge®, installation-error coverage differs by shingle line: 25 years non-prorated on Timberline HDZ®, the GAF option in our FOUNDATION™ system, and 30 years non-prorated on Timberline UHDZ® with UltraMat™ (IMPACTSHIELD™) and Timberline ArmorShield® II, which GAF's warranty lists as Timberline® AS II (STORMLOCK™).
Owens Corning Duration FLEX installs
Eligible for the Owens Corning Platinum Protection warranty, available only at Platinum Preferred standing, available because Atrium holds Owens Corning Platinum Preferred, the top tier of the Owens Corning contractor network.
GAF Timberline ArmorShield II installs
Eligible for the GAF Golden Pledge® Limited Warranty on qualifying GAF roofing systems, available because Atrium is a GAF Master Elite® Contractor. The tier-by-tier difference is explained on our brands and certifications page.
Malarkey Legacy installs
Eligible for the Malarkey Certified Pro Warranty, available at Emerald Pro standing, available because Atrium holds the Malarkey Emerald Pro certification. It requires a complete Malarkey Secure Choice™ roof system (the shingles installed together with Malarkey's own accessories) rather than the shingle alone.
Atlas Pinnacle Impact and StormMaster Shake installs
Eligible for the Atlas Signature Select Roofing System Limited Warranty, available at PRO+ Gold Select standing, available because Atrium holds Atlas PRO+ Gold Select. It requires a complete Atlas system (shingle, underlayment and accessories) rather than the shingle alone.
Atrium's workmanship layer
Atrium backs every roof replacement with a written 10-year workmanship warranty. It is non-prorated, so coverage in year ten is identical to year one, and it is fully transferable to the next owner. If a covered installation defect appears, we cover the labor and the materials to correct it.
The warranty covers the roof replacement we performed. It is our installation of your new roof system that carries the ten years.
It covers our installation, and that is all it covers. It is not insurance and it does nothing for hail, wind, or anything else an insurance claim would handle. The manufacturer's warranty on the shingles themselves is a separate document.
If you want the mechanics behind all of this (how the two documents differ, what quietly voids them, and how the certification tier decides which one can be registered), our roof warranty guide walks through it.
Whichever warranty applies to your system is registered in your name and delivered as part of the Power Package: up to five documents, depending on your roofing system; on a shingle system that includes the supplier's material invoice.
The manufacturers behind this system
Duration FLEX is one of the five representative options in STORMLOCK™.
ReadTimberline ArmorShield II is one of the five representative options in STORMLOCK™.
ReadLegacy is one of the five representative options in STORMLOCK™.
ReadPinnacle Impact and StormMaster Shake are two of the five representative options in STORMLOCK™.
ReadSTORMLOCK™ FAQs
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