What the Inspection Documents
Membrane field: We walk every section of the membrane field, noting age and condition category, any blistering, splitting, or oxidation on older systems, and any mechanical damage from foot traffic, equipment installation, or prior repair work. On TPO and PVC systems, we probe-test a sample of field seams to identify cold welds or adhesive-bond failures that are not visible from the surface. On EPDM systems that are more than 15 years old, we document seam condition at every lapped joint in each zone and photograph any areas where the seam tape or liquid adhesive bond shows deterioration.
Flashing details: Parapet flashings, penetration details, curb flashings, drain sumps, and edge-metal terminations are the highest-failure-probability zones on any St Louis commercial roof. We photograph every flashing detail and note condition against the manufacturer standard. Deteriorated sealant, separated termination bars, lifted penetration flashings, and cracked coping cap joints are all documented with coordinates on the zone diagram. The freeze-thaw cycle the metro experiences concentrates more damage at these transition zones than anywhere else on the roof field, which is why we treat them as a separate category rather than folding them into the general membrane assessment.
Moisture Core Protocol
Moisture cores are the only reliable way to determine whether the insulation under the membrane has been compromised. Visual inspection alone cannot detect wet insulation. A roof that looks intact on the surface can have saturated insulation across 40 percent of the field area, which changes the recover-versus-replace decision entirely and fundamentally alters what the capital planning horizon looks like for the building.
We pull cores at representative locations across the roof, a minimum of five for roofs under 20,000 square feet, scaling up for larger systems, and at any location where the surface shows evidence of long-term moisture retention: staining, organic growth, unexplained blistering, or seam distortion. Core results are documented with photos and noted on the zone diagram by location. On St Louis buildings with older BUR systems or modified bitumen recovers, core sampling also reveals prior layer history that is otherwise undocumented. We regularly find two or three layers of prior membrane under what appears to be a single system, and that finding changes both the engineering load assessment and the applicable code requirements for the next scope.
Drainage Assessment
We assess every drain and scupper on the roof, including flow rate after a simulated fill, debris accumulation, deterioration of drain-ring hardware, and sump geometry relative to the membrane surface. Drainage problems are often the first indicator of a maintenance gap. In St Louis, clogged roof drains during a late-spring thunderstorm can produce standing water that triggers ceiling failures in the space below, particularly on large-footprint industrial and distribution buildings in the Earth City and Hazelwood corridors where drain counts are low relative to roof area.
Ponding water within 48 hours after a rain event is a warranty-flag condition under most major manufacturer NDL programs. We document pond locations with photographs and measurements and flag any condition where insulation compression or drain blockage has created a new low point since the prior inspection. Correcting ponding areas before they trigger warranty compliance issues saves the owner the cost of a warranty re-inspection and possible remediation under the manufacturer's punch-list process.
Reporting Format and Capital Integration
The inspection report we deliver is formatted for use by facility managers, property managers, and capital planners. Every finding is categorized by urgency, immediate action, near-term action, monitor, or routine, assigned a zone reference from the diagram, and linked to a recommendation. The report concludes with a capital-horizon summary that gives the owner a 1-to-5-year projection of the expected maintenance spend and the replacement trigger point, referenced against the current condition tier of each zone.
For multi-building portfolios including St Louis owners who hold properties across Clayton, Chesterfield, Maplewood, and the I-270 corridor, we produce reports in a consistent format across all buildings so the owner can compare condition tiers and prioritize capital allocation without reconciling different contractors' documentation styles. We do not write inspection reports that can only be acted on by our own crews. The report stands on its own, and any qualified contractor should be able to use our documentation without asking us to explain what we found.
Structural and Deck Indicators
Where the membrane or insulation shows deflection patterns, we note potential deck-support issues and recommend a deck inspection port to confirm. We do not open ports during a standard inspection, that is a separate scoped activity, but we flag zones where the above-deck evidence suggests below-deck investigation is warranted. This is particularly relevant for older concrete-deck buildings in Downtown St Louis and the Soulard warehouse corridor, where decades of freeze-thaw cycling can accelerate deterioration at the deck level without producing immediately obvious surface symptoms.
Buildings constructed before the 1980 energy code updates often have perlite or wood-fiber insulation that absorbs moisture readily. When we find deflection or soft zones on those systems, we prioritize deck investigation in the next inspection scope because the deterioration pathway from wet organic insulation to deck corrosion on older metal-deck buildings is faster than on polyiso systems. Documenting the indicator early is what allows the owner to plan the investigation on their schedule rather than responding to a structural emergency.
Annual and Semi-Annual Inspection Programs
Manufacturer warranties on TPO, EPDM, and PVC systems require documented annual or semi-annual inspections to remain active. We schedule inspections for our active maintenance clients around the St Louis climate calendar: the post-winter visit in March or April documents what the freeze-thaw season produced, and the fall visit in September or October prepares the roof for the next ice season and documents any summer storm damage. Those two windows address fundamentally different damage categories and are not interchangeable.
Annual programs include the full inspection documented above plus a comparison against the prior year's report to flag any conditions that have advanced since the last visit. Drain clearing is included in every annual visit. Maintenance program clients receive priority response when emergency conditions arise after a storm event, which in the St Louis metro means derecho response in late spring, major hail events in April and May, and ice-storm response in the years the metro sees significant accumulation.
