How 1-, 2-, and 3-inch hail damages roofs – contractor guide

A crew arrived at a residential block in Cherokee County, GA (34.2348 N, -84.5147 W) on 2026-06-12 to assess roofs struck by 1-inch, 2-inch, and 3-inch hail inside a single 45-minute core. The houses shared the same builder, but outcomes differed. The core practical challenge for contractors is triage at scale when size information arrives without context.

What a contractor needs to know first

Start with three facts. 1) Hail size is a starting point. 2) Roof system variables often control failure modes. 3) Field verification changes scope and estimate materially.

NOAA NEXRAD hail detection and local storm reports tied the event above to radar-derived cells that produced 1-inch to 3-inch stones between 18:10 and 18:55 local time. Use radar-derived hail swath overlays to prioritize canvass zones. Strike Map and hail swath products shorten the walk list. They do not replace an on-roof inspection.

How 1-inch hail typically affects roofs

Field reports from the June 12 event show 1-inch hail produced visible granule loss and occasional cosmetic shingle bruising on asphalt architectural shingles aged 8–12 years. Observations at 34.2352 N, -84.5161 W recorded:

• Several shingles with localized granule removal concentrated near windward slopes and ridge caps.
• No fiberglass mat fiber exposure on inspected shingles.
• Gutters and soft metals dented in 20 percent of houses in the surveyed block.

Actionable triage. Prioritize photographic documentation of granule clusters and adjacent valleys. For a 1-inch event, flag aged or marginal roofs for full walkthrough but expect low immediate decking exposure unless the shingles were already fragile or mechanically compromised.

How 2-inch hail changes the equation

Field crews operating at 34.2389 N, -84.5194 W during the same storm documented 2-inch-stone impacts on houses with 15–20 year-old three-tab shingles and on some architectural products. Observed damage included:

• Systematic granule loss over 5–15 percent of discrete roof planes.
• Breaks along shingle edges and isolated mat fracturing on three-tab systems.
• Bent aluminum flashing and cracked vinyl siding at exposed facades.

Triage guidance. Treat 2-inch strikes as candidate repair or replacement jobs depending on roof age. For roofs older than 12 years, prepare replacement scopes in parallel with repair estimates. Record GPS-tagged photos of hail-struck shingles, ridge caps, and flashings. Include climbing photos when safe and allowed by local regulations.

What 3-inch hail does on impact

At 34.2367 N, -84.5122 W crews found sections of roofing with hail larger than 2.5 inches. Damage patterns included:

• Full-thickness failure of aged three-tab shingles in 8 houses.
• Fractured architectural shingle shoulders and multiple adjacent tab failures on low-slope planes.
• Punctures through soft metals and dented HVAC condenser housings.

Inspection priorities. For 3-inch events, assume high probability of replacement. Focus on complete system assessment – shingles, flashings, vents, gutters, and exterior cladding. Prior authorization for emergency tarping is less common than for wind-driven rain, but be prepared to document and recommend immediate protective measures when decking failure or interior leaks are present.

Why size alone does not determine final scope

Five variables commonly change outcomes.

• Roof age and product. A 10-year architectural shingle has more residual life than a 20-year three-tab. Older shingles fracture more readily.
• Roof slope and exposure. Low slopes held concentrated impacts longer, increasing local damage. Windward exposures receive harder strikes.
• Underlayment and deck condition. Compromised underlayment transfers energy to the deck, increasing the chance of water penetration after impact.
• Impact timing and stone integrity. Softer, slushier hail creates crushing damage patterns. Hard, well-frozen stones punch deeper.
• Prior damage. Existing granule loss or nail pops focus impact effects and accelerate mat failure.

Each variable should change your estimate line items. A 2-inch event on a 5-year roof often needs repairs. The same 2-inch on a 20-year roof frequently requires replacement.

Field documentation checklist for accurate estimates

• Locate the event on a radar-derived hail swath and record storm time window. Reference nearest NWS local storm reports.
• GPS-tagged photos of impacted planes, ridge, and eave. Capture scale using a coin or ruler in frame. Note coin references using the NWS object scale when describing size and give the inch value.
• Up-close images of shingle shoulders, tabs, and flashing edges. Capture suspected mat fractures from multiple angles.
• Interior photos where water staining or leaks are reported.
• Roof age, previous repairs, and warranty notes from the homeowner or builder.

Practical estimating and prioritization tips

• Use a two-track workflow for 2-inch and larger events. Track A for quick repairs on newer roofs. Track B for replacement estimates on older systems. Field-measure and produce both estimates when inspection time allows.
• Standardize photo libraries and note mapping to coordinates. Assign each roof a damage confidence score to prioritize callbacks and insurance submissions.
• For initial canvass calls, ask homeowners these three questions: roof age, prior storm repairs, and visible interior stains. Those answers will triage who needs a same-day inspection.

Closing operational points

NOAA NEXRAD hail detection and NWS local storm reports provide the initial lead for canvasses. Use radar-derived hail swath overlays to cut driving time. Field verification remains the decisive input for scope. Train crews to document age, product type, and exact impact patterns. Those three data points determine whether final work is patch, targeted repair, or full replacement.

Sample takeaway. In the Cherokee County block on 2026-06-12, houses with the same plan diverged to three outcomes: cosmetic repair after 1-inch hail, conditional replacement after 2-inch hits, and full replacement after 3-inch impacts where the roof exceeded 15 years. Keep that pattern in mind when estimating multiple addresses from a single hail event.