Commercial roof hail damage assessment and repair in Louisville — impact documentation, membrane bruising, HVAC equipment assessment, and insurance-grade photo logs for Jefferson County buildings.
Damage Repair
Louisville sits on a storm track that pulls hail-producing convective cells north from Tennessee and Alabama through Kentucky each spring and early summer. Single-ply membranes, modified bitumen, and rooftop HVAC equipment are all vulnerable to hail damage. We assess, document, and repair hail-damaged commercial roofs to insurance and manufacturer standards.
Hail damage on a commercial flat roof is invisible from the ground. TPO and EPDM membranes absorb hail impact as a bruise — a deformation of the membrane that does not immediately create a hole but accelerates UV degradation and reduces the membrane's remaining useful life. Large-diameter hail — one inch and above, which Louisville sees several times per decade — can crack EPDM, split TPO at seams under impact stress, and puncture modified bitumen surface plies.
Rooftop HVAC equipment shows hail damage more visibly: fin damage on condenser coils, dents in equipment enclosures, cracked PVC vent caps, and damage to any polycarbonate or translucent panels on skylights or rooftop structures. Documenting this equipment damage is part of a complete hail damage assessment — it is insured under the same commercial property policy as the roof membrane.
Louisville's hail season peaks in April through June, with a secondary peak in September and October as fronts from the Gulf track northeast. After a hail event with reported stone size of three-quarters of an inch or larger anywhere in Jefferson County or adjacent counties, we begin outreach to buildings on our inspection list and respond to new calls. The documentation window matters — hail spatter marks on rooftop equipment age quickly, and membrane bruising is most clearly visible on newly impacted surfaces.
TPO: Thermoplastic polyolefin membranes show hail damage as circular impact marks — depressions in the membrane surface that, under UV exposure, become stress points and eventual crack nucleation sites. Large-diameter hail can split TPO at heat-welded seams if the impact coincides with a seam lap. We assess impact density, bruise depth, and seam condition across the full roof field.
EPDM: EPDM rubber membranes are more impact-resistant than TPO at moderate hail sizes but crack at large-diameter impact. Cracked EPDM at hail strikes creates an immediate water infiltration point. We probe every EPDM field for hairline cracks that are not visible to casual inspection.
Modified bitumen and BUR: Surface mineral granules on cap sheets provide some hail impact resistance. Large hail removes granules and exposes the bitumen surface to direct UV. We assess granule loss density across the field — diffuse loss is a maintenance issue; concentrated loss at impact craters is a claim item.
Metal coping and flashing: Metal coping caps, counter-flashings, and roof edge metal show hail impact as dents and dings that can break sealant seals at end laps or displace coping sections. We document all metal component impact damage.
We carry a hail damage mapping grid — a wire test frame that we drag across the roof surface to identify impact marks by density. HAAG Engineering, a firm whose assessment protocols are accepted by major commercial insurers, publishes guidelines for hail density mapping on commercial roofing systems. Our protocol is based on those published standards, which means our documentation is credible to adjusters familiar with commercial hail claims.
We photograph impact marks, measure stone diameter from impact impressions on lead test caps (a 4-inch by 4-inch lead sheet that captures true hail diameter at time of impact — often attached to HVAC curbs after a hail event), and document the concentration of impacts per 100 square feet across the roof field and in perimeter zones.
The written scope identifies which areas Separating these clearly is the most useful thing we can do for your adjuster.
Minor hail (under one inch, low density): EPDM crack repair with EPDM-compatible caulk and patch. TPO impact marks that have not created open membranes typically do not require immediate repair but are documented for the maintenance record and monitored for UV-accelerated degradation. Granule-loss areas on modified bitumen receive emulsion coating.
Moderate hail (one inch to one and a half inches, moderate density): Seam inspection and re-welding where impact stress has created open laps. EPDM crack repair across the field. Equipment damage documented for the equipment line of the property claim.
Large hail (over one and a half inches, high density): Full replacement scope is often the appropriate answer. When impact density is high enough that the membrane has been compromised across the field, repair is not economically defensible against replacement. We document why a full replacement scope is warranted and coordinate the scope with your insurer's replacement cost provisions.
Within two weeks if hail diameter was reported at one inch or larger anywhere in Jefferson County during the event. Hail impact marks on TPO and EPDM are clearest on recently impacted surfaces — UV exposure begins to degrade the clarity of bruise marks over weeks. Equipment impact evidence on metal surfaces also ages as surfaces oxidize. Earlier inspection produces better documentation.
Potentially. Commercial property policies typically require prompt notice of loss — the specific window varies by policy but is often 12 months from the date of loss, sometimes less. If you missed the window, we can still assess the roof condition and document current damage for the maintenance record, but we cannot retroactively document a claim event that predates the inspection. Talk to your insurance broker about your policy's notice-of-loss provisions.
Yes. Rooftop HVAC fin damage, enclosure damage, and vent cap damage are documented in the same field inspection as the membrane. We photograph the equipment and note impact evidence on it in the same report. Your mechanical contractor or HVAC service company handles the operational assessment of the equipment — we document the physical impact evidence.
Tell us about the building and the roof problem. We'll document it and put a plan in writing — no pressure, no boilerplate.
Get a roof assessment →