Key numbers
77 verified hail storms with stones of 1.75 inches or larger reached Travis County, which includes Austin, from 1984 to 2025 in the storm records we keep; the largest measured 5 inches (softball size) on May 20, 2011 (NOAA NCEI).
| Hail storms by decade, 1984 to 2025 | 1980s: 8, 1990s: 16, 2000s: 24, 2010s: 13, 2020s: 16 Source: NOAA NCEI |
|---|---|
| Largest hail | 5 in. (softball), May 20, 2011 Source: NOAA NCEI |
| Costliest hail storm | $160 million insured losses (2006 dollars), April 20, 2006 Source: Insurance Journal |
| 1.49 million | Slate or synthetic slate was the main roofing material on 1.49 million U.S. homes in 2020. Source: U.S. Energy Information Administration (EIA), 2020 |
| Over 50 | NAHB's 2007 study says slate, copper and clay/concrete tile roofs have the longest life expectancy, over 50 years. Source: National Association of Home Builders / Bank of America Home Equity, 2007 |
A storm counts when NOAA lists a report in Travis County. Each hail size is the storm's largest report in the seven Austin-area counties, which may have fallen in a neighboring county, and insured losses cover every area the storm hit.
A slate roof in Austin is either natural stone quarried in thin pieces or a synthetic polymer slate molded to look like it, and the deciding question is weight. Natural slate can outlast the house but is heavy enough that most homes framed for shingles need a structural check before it goes on. Synthetic slate gives a very similar look at close to shingle weight, so it is the practical choice when the house was not built for stone.
Natural vs synthetic slate
| Natural slate | Synthetic slate | |
|---|---|---|
| Weight | Several times a shingle roof; often needs framing work | Close to a shingle roof |
| Lifespan | The stone can outlast the house; flashing and fasteners need renewal | Decades, set by the manufacturer’s warranty |
| Hail | Large hail can crack individual slates | Many products carry an impact rating; confirm the UL 2218 class |
| Repairs | Single slates replaced by hand | Replacement pieces from the same product line |
| Cost | The highest of any common roof | Well below natural slate, above architectural shingles |
What matters for slate in Central Texas
- Framing first. If you are switching from shingles to natural slate, the roof structure changes. The City of Austin’s permit exemption only covers a new roof covering that does not adversely affect the roof structure, so that switch should be checked with the city before work starts.
- Hail and heat, not snow. Central Texas slate faces spring hailstorms and long, hot summers. The stone shrugs off heat; the underlayment and sealants beneath it are what age, so they should be specified for high temperatures.
- Tear-off is required. Georgetown requires an existing slate roof to be removed before any new covering goes on, and Pflugerville’s re-roof certificate rules out laying a new roof over slate.
- Wildfire zones. In Austin’s Wildland-Urban Interface area the roof assembly must be Class A. Natural slate is noncombustible; with synthetic slate, ask for the product’s fire class in writing.
Repairing an existing slate roof
Older slate roofs often leak at the flashing, not the stone. Replacing chimney, wall and valley flashing and swapping out cracked slates can add years without a full replacement. When a storm cracked a lot of slate at once, see Austin storm damage repair and our Austin roof repair page.
Cost and next steps
See what a slate roof costs in Austin. If slate is more than the budget allows, tile, synthetic cedar or stone-coated metal give a similar high-end look, and financing is available. We are veteran-owned, family-run since 1990, an Owens Corning Platinum Preferred contractor, and have 650+ Google reviews. Call (512) 610-5897 or book a free Austin roof inspection; we reply the same business day.
Sources: City of Austin, Work Exempt from Building Permits; City of Austin, Wildland-Urban Interface Code; City of Georgetown, Re-Roofing Permits; City of Pflugerville, Re-Roof Inspection Certificate.
