Commercial Roof Repair

Mojave Desert Flat Roof Failure Modes

UV seam degradation: Single-ply seams on Las Vegas commercial roofs are exposed to year-round UV Index 10+ conditions that temperate-market membranes are not designed to handle at full intensity. Weld seams on TPO installed before the mid-2010s formulation improvements show surface brittleness and micro-cracking at the weld edge that is not visible without close-contact inspection. We probe-test seams and document brittleness by location before writing any repair scope — seams that cannot carry a probe test get replaced, not caulked.

Heat-cycling flashing failures: Parapet base flashings, curb flashings at HVAC equipment, and pipe boot terminations are subjected to the same 40–55°F daily thermal swing that cycles through the field membrane. Metal counter-flashings expand and contract against masonry and concrete substrates that move at different rates. The result on Las Vegas commercial buildings is flashing separation at the termination bar or counter-flashing reglet — often visible as a lifted edge with open gap that water enters laterally during monsoon events. Repair scope: remove the failed termination, re-flash with compatible base flashing, re-terminate with a properly embedded reglet detail.

Monsoon drain failure and ponding: The 4.2 annual inches of precipitation that Las Vegas receives arrives primarily as short intense events during the July–September monsoon season. Roof drain systems sized for a slow sustained rainfall rate frequently cannot handle 1–1.5 inches in 45 minutes. Drains partially blocked with wind-blown debris, HVAC condensate scale, or accumulated gravel from ballasted perimeter sections go from marginally adequate to completely overwhelmed in a single monsoon event. We flow-test every drain during repair inspections — visual confirmation that a drain is unobstructed is insufficient. We run water through the body and verify unobstructed connection to the storm line.

• UV seam brittleness and micro-cracking — primary failure mode on pre-2015 TPO and EPDM in Las Vegas
• Heat-cycling flashing separation — parapet base, counter-flashing reglets, curb terminations
• Monsoon drain failure and ponding — blocked bodies, undersized capacity, failed collar-to-membrane seals
• Penetration boot deterioration — HVAC curb corners, conduit sleeves, exhaust flue flashings
• Membrane blister formation — moisture vapor cycling through the membrane in extreme ambient heat

How We Make the Repair-vs.-Replace Call in Las Vegas

We core-pull in 5 to 10 representative locations on any Las Vegas roof where insulation saturation is suspected — visibly sagging membrane, monsoon-season ponding that has persisted for multiple years, or any building where prior drainage issues have been documented. If more than 25% of cores read wet, the repair economics no longer support a surface patch strategy. Recovering a wet insulation system in Las Vegas traps moisture beneath a new membrane that the ambient heat then cycles through vapor pressure cycles every day — the result is blister formation and accelerated degradation of the new membrane within 3–5 years. In that case, we recommend full replacement and explain the core data behind it.

When cores confirm dry insulation and the failure is localized — a perimeter flashing run on one parapet face, a cluster of seam failures near a single drain, one ponding area caused by a blocked drain — repair is the appropriate scope. We do not engineer a replacement project out of a repairable problem. Las Vegas has enough legitimate replacement-cycle work in its aging commercial inventory that we have no need to create it where it does not exist.

Repair Closeout Documentation

Every repair we complete is closed out with a photo-keyed map of repair locations on the roof plan, before-and-after photographs at each repair point, product data sheets for all materials applied, and a written service record that goes into the building's roof asset file. For buildings in active manufacturer warranty periods, we document the repair in a format compatible with the warranty administrator's maintenance record requirements — missing documentation is the most common reason Las Vegas warranty claims are denied.

Repair documentation from jobs we complete feeds into annual condition reports for buildings on our maintenance contracts, giving the building owner a running picture of where their roof is in its lifecycle and what the next capital decision horizon looks like.

Frequently asked questions