Commercial Roofing in Austin: Keeping Flat and Low-Slope Roofs Working
A commercial roof protects inventory, equipment and the people inside. This page covers the roof types common on Austin buildings, the local hail record and how to plan maintenance and replacement.
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Common commercial roof types
Single-ply membranes
Sheets such as TPO and EPDM cover large flat areas. Our TPO vs. EPDM comparison explains how they differ.
Metal roofs
Common on warehouses and shops with some slope. Fasteners and seams need regular attention.
Built-up and modified bitumen
Layered systems found on many older buildings. Blisters and cracks are the warning signs.
Steep-slope sections
Some offices and retail buildings use shingles or tile on parts of the roof, with flat areas behind parapets.
Rooftop equipment
HVAC units, curbs and pipes all pierce the roof. The flashing around each one is a frequent leak source on commercial buildings.
Austin hail and low-slope roofs
NOAA's Storm Prediction Center logged 91 hail reports within 10 miles of Austin from 2015 through 2024. Thirty of them were 1.75 inches or larger, and the biggest reached 3 inches on September 24, 2023. Large hail fell in 5 of those 10 years.
On a flat roof, hail damage hides well. A membrane can be punctured or bruised without anything visible from the parking lot, and water may travel under the surface before it shows inside. The Austin area also spans 4 counties, Bastrop, Hays, Williamson and Travis, so a storm can hit one property and miss another a few miles away. After a hail event, a walk of the roof is the only way to know.
Flat roofs also face the Texas sun on every square foot. Heat makes membranes expand and contract each day, which stresses seams and flashing over time. Hail that lands on a membrane already worn by years of sun is more likely to cause a puncture than hail on a newer system.
Warning signs on a commercial roof
Water standing on the roof two days after rain.
Ceiling tiles with stains or sagging.
Seams that are lifting or membranes that look wrinkled.
Rust or loose fasteners on metal panels.
Clogged drains, scuppers or gutters. See flat roof drainage systems.
A simple maintenance rhythm
Spring and fall walk
Clear debris, check drains and look at seams, flashing and rooftop units.
Check after storms
Hail and high wind call for a dedicated walk, with photos of any damage.
Repair small issues fast
Seam repairs and new flashing cost less than wet insulation and decking.
Plan the replacement
When repairs keep coming back, budget for a new system before a failure forces it. Our guide to signs a commercial roof needs replacement helps.
Working with GemSco on a commercial roof
GemSco is family owned, fully licensed and insured, with 20+ years in residential and commercial roofing, including low-slope and flat roofs. We give free estimates and plan work around your operation. Read about reducing business disruption during roof repairs, our general commercial roofing service and our work in Austin. For storm work on any building, see hail damage roof repair in Austin.
When we look at a commercial roof, we document what we find with photos and give a written estimate that separates urgent repairs from planned work. That way a property owner or manager can decide what to fund now and what to schedule. Our article on a commercial roof maintenance plan goes into more detail on what a yearly program should include.
Frequently Asked Questions
How often should a commercial roof in Austin be inspected?
Twice a year is a common rule for flat and low-slope roofs, usually in spring and fall, plus a walk after any hailstorm or strong wind. Regular checks catch clogged drains and open seams before they let water into the building.
Is a coating a good option for an older flat roof?
Roof coatings are one option on the market for some roofs that are still sound underneath. They do not fix wet insulation or failed decking. An inspection should confirm the condition of the layers below before anyone recommends a coating, a repair or a full replacement.
Can a commercial roof be replaced while the business stays open?
Often, yes. Work can be staged by section, with access, noise and safety planned ahead. The details depend on the building, the roof system and how the space is used, so they should be agreed on before the job starts.
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