When hail hits a Dallas commercial flat roof, the damage that costs you money is not always the damage you can see from the parking lot.
The May 2023 storm system that crossed Collin and Denton counties produced documented 2.75-inch hailstones across a wide band from Frisco through Allen. That event damaged more commercial TPO and EPDM in northern Dallas County than any single storm in the prior decade. We have inspected roofs from that event where building owners were told by a quick-look roofer that the roof was fine — and where core samples showed compromised insulation facers and cracked membrane at seam edges that would turn into active leaks within one wet season.
The 2024 NW Dallas hail event the following spring hit a different building stock — older modified bitumen and BUR systems on industrial buildings along the Stemmons and I-35 corridors. Hail damage on granulated modified bitumen is harder to read than TPO; the granule displacement pattern looks like normal weathering to an untrained eye. We know the difference, and we build documentation that shows the difference clearly.
What we give you is a roof scope package that the people handling your claim can actually use: zone diagrams, GPS-tagged photos at every impact site, core sample results, and a written repair-vs-replace recommendation with the basis for that recommendation spelled out.
Not all hail damage is equal, and confusing the categories is how building owners end up with underpaid claims or unnecessary repairs. Cosmetic damage means the membrane surface shows marks but the waterproofing layer is intact — granule displacement on modified bitumen, surface scuffing on TPO. Functional damage means the waterproofing layer is compromised: fractured TPO at impact points, cracked EPDM where the stone hit a seam, split modified bitumen cap sheet at impact sites.
Impact bruising is the middle category and the most misread. On mechanically attached TPO over polyiso insulation, large hailstones can transfer energy through the membrane into the insulation facer without puncturing the membrane surface. The facer fractures, the insulation loses structural integrity, and the membrane is now unsupported at those points. In Dallas heat cycles, the membrane delaminates at those locations over 12-24 months and eventually fails. This damage is invisible from above without core samples, and it is the category that drives the largest repair vs. replace scope decisions on post-storm inspections.
We document all three categories separately, zone by zone, with a photo index that ties each damage type to a roof zone on the diagram.
Every impact site gets photographed at three distances: a GPS-tagged wide shot that shows the roof zone context, a mid-range shot that shows the impact pattern relative to seams and penetrations, and a close-up shot with a measuring coin for scale. We document hailstone size reference against standardized markers where the storm report's stone size is available, and we note every impact site that falls within 12 inches of a seam or flashing detail — those sites carry elevated risk of functional damage even when the membrane surface looks intact.
Core samples are pulled at locations where we suspect insulation damage beneath intact-looking membrane — typically at the center of high-impact zones and at any low point in the roof where water pools after a storm. Core results are photographed and logged against the zone diagram.
Storm date documentation is included: we pull the nearest NOAA NEXRAD radar data, the SPC storm report for the event, and any available Verisk/CoreLogic hail footprint map for the building's address. This documentation anchors the damage to the specific storm event your claim covers.
