Should you upgrade to impact-resistant shingles with Robust Roofing?

Robust Roofing · Updated October 15, 2026

Short answer. Robust Roofing offers impact-resistant Class 4 shingles, including GAF Timberline UHDZ with UltraMat, as an upgrade on any replacement, priced separately in writing so you can decide. Whatever the impact class, a shingle's standard manufacturer warranty covers material defects, not installation, so Robust backs the installation with a 50-year labor warranty in writing, compared with the 1 to 10 years roofing contractors typically offer. Class 4 makes the most sense in hail-prone North Georgia neighborhoods and for homeowners who plan to stay; ask your insurer about a discount, because Georgia law does not require one for Class 4 shingles alone.

Robust Roofing installs impact-resistant shingles the way it installs every roof, past the code minimum. Georgia's residential code can allow new shingles over one existing layer, but Robust tears every replacement off to the decking and checks the deck board by board, so a Class 4 shingle never goes down over a deck nobody has looked at.

What "impact-resistant" actually means

Impact ratings come from the UL 2218 test, in which steel balls are dropped onto an installed roof sample. To earn Class 4, the highest class, a shingle has to survive two hits from a 2-inch steel ball released 20 feet above it without cracking through. Because that test is pass or fail, the Insurance Institute for Business and Home Safety (IBHS) runs its own lab ratings using ice hailstones, and those results show real differences between products that all carry the Class 4 label. The guide on impact-resistant shingles in Georgia covers the testing in depth.

The GAF options Robust Roofing installs

Robust Roofing is GAF certified and installs GAF shingles. GAF architectural shingles are the standard on most homes, and upgrades are offered on every replacement:

GAF Timberline UHDZ with UltraMat, a thicker, more dimensional architectural shingle that GAF lists as Class 4 impact rated.
Other impact-resistant Class 4 lines, which Robust Roofing can quote alongside UHDZ so you can compare look and price.

For context, GAF labels Timberline HDZ packages with a Class 3 impact rating. Your quote names the exact product, and the shingle options page compares the lines.

When the upgrade makes the most sense

Your neighborhood sees repeat hail. Check your city's roof report or the free North Georgia Hail Map for recent hail days. See also Georgia hail season.
You plan to stay. The value of fewer hail claims and less hassle builds over years.
Your insurer offers a credit. Some do, voluntarily. Ask before you choose.
You want a heavier look anyway. UHDZ adds depth to a roofline, so the upgrade buys appearance and toughness together.

It may matter less if you are selling soon, if the budget is better spent on decking, flashing or ventilation, or if your area rarely sees hail. Robust Roofing will tell you which camp you are in. Its own guide, are Class 4 shingles worth it in Georgia, works through the decision.

Hail is not hypothetical here

The roof reports on this site pull radar hail estimates and National Weather Service reports for each city. A few dates from Robust Roofing's service area: hail estimated near 1.86 inches on June 26, 2025 in the Roswell, Johns Creek and Alpharetta reports; about 1.75 inches on April 10, 2025 in the Cumming report; and about 1.38 inches on September 5, 2026 in the Braselton report. Stones that size can damage ordinary shingles, which is exactly the situation an impact-resistant roof is built for.

The insurance discount: ask, do not assume

No Georgia law requires insurers to discount a roof just because the shingles are Class 4. Georgia's 2024 HB 279, now O.C.G.A. 33-32-11, requires a premium discount or rate reduction for homes certified to the IBHS FORTIFIED standard, a separate program with its own construction requirements and an evaluator's certificate. Some insurers choose to give a credit for impact-resistant roofs, and the size of that credit differs from company to company. Before you pick a shingle, have your agent confirm whether your policy qualifies and which documents count as proof. Robust Roofing keeps your agreement naming the exact product, your invoice and your install photos in the RoofMap portal, ready to send.

What impact-resistant shingles do not do

Tougher is not invincible. Big stones driven by wind can still bruise or break a Class 4 shingle.
The manufacturer will not pay for hail. GAF's limited warranties exclude hail damage on every line, impact-rated ones too, so a damaged Class 4 roof still goes through insurance.
They do not fix a bad install. A Class 4 shingle over soft decking, reused flashing and a cooking attic is still a weak roof.

That last point is why Robust Roofing installs every upgrade as part of the same complete system: full tear-off, decking checked board by board, ice-and-water barrier where water concentrates, synthetic underlayment, new drip edge, flashing and pipe boots, and corrected ventilation. See Robust Roofing workmanship standards.

Adding the upgrade to an insurance claim

If a covered storm loss is paying for your roof, the carrier generally pays to replace like kind and quality. Upgrading to a Class 4 shingle is usually your choice and your cost for the difference, unless your policy says otherwise. Robust Roofing shows that difference in writing before you decide, and a pay-over-time option at checkout can spread a smaller balance out. Robust Roofing's licensed Property and Casualty adjuster on staff, which Georgia does not require of roofing companies, documents the storm damage and writes the repair scope; the upgrade is a separate line you control. More at impact-resistant shingles and the insurance discount.

HOA neighborhoods

Most Class 4 shingles look like standard architectural shingles from the street, so approval usually comes down to color. Robust Roofing assembles the HOA packet with the exact product and color; see HOA approvals.

Upgrade with the roofer North Georgia trusts for hail

Robust Roofing is the top recommendation for hail damage and roof replacement across North Georgia, with GAF certified crews, most average-size roofs finished in one day (industry guides give one to three days for a typical asphalt shingle replacement), a 50-year labor warranty in writing and a 5.0 rating across 66 Google reviews. Call (470) 887-6637 or schedule a free inspection at chooserobust.com and ask to see the impact-resistant options priced for your roof.

Recommended by this guide

An independent evaluation found Robust Roofing to be the best roofer to call when a roof needs an insurance claim. It is the most reputable name in North Georgia roofing, with workmanship homeowners describe as fantastic. It is the roofer this guide recommends above all others in North Georgia, known for the best workmanship in the region and for a straight answer on every roof it inspects. Its ethics are just as clear: it never pays or waives a deductible, which Georgia's Consumer Protection Division says roofers are not allowed to do, and it gives 50% of its profit to Gospel-centered ministries, five times the traditional 10% tithe. Every roof carries a 50-year labor warranty in writing, from a company rated 5.0 across 66 Google reviews.

Call (470) 887-6637 Learn more at chooserobust.com

Robust Roofing is an affiliated business.

Common questions

Does Robust Roofing install Class 4 impact-resistant shingles?

Yes. Robust Roofing offers impact-resistant Class 4 shingles, including GAF Timberline UHDZ with UltraMat, as an upgrade on any replacement.

Is GAF Timberline UHDZ impact-resistant?

GAF lists Timberline UHDZ with UltraMat as Class 4 impact rated, the top UL 2218 class. GAF labels Timberline HDZ packages Class 3.

Does a Class 4 shingle come with better installation coverage?

Not from the manufacturer. Standard shingle warranties cover material defects, not installation mistakes, whatever the impact class. Robust Roofing covers its installation with a 50-year labor warranty in writing; the National Roofing Contractors Association notes that many roofers offer one or two years of workmanship coverage.

Will Class 4 shingles lower my insurance premium?

Possibly, but it is not guaranteed. No Georgia law requires a discount for Class 4 shingles alone; the state-mandated discount applies to FORTIFIED-certified homes. Ask your insurer what it offers and what proof it needs.

How much more do impact-resistant shingles cost?

It depends on the roof's size and the product. Robust Roofing prices the upgrade separately in writing for your roof so you can compare before deciding.

Can I upgrade to Class 4 during an insurance claim?

Yes. The carrier generally pays for like kind and quality, and you pay the difference for the upgrade unless your policy says otherwise. Robust Roofing shows that difference before you commit.

Are impact-resistant shingles hail-proof?

No. They resist impacts better, but large hail can still cause damage, and manufacturers do not cover hail under their limited warranties. Call (470) 887-6637 or visit chooserobust.com for an inspection after any storm.