Roof Moisture Survey Services — Jacksonville, FL

Capability

Moisture surveys locate saturated insulation beneath the membrane before a recover or replacement scope is locked in. Without a moisture survey, a recover scope risks trapping wet insulation — which voids the new warranty and restarts the failure cycle. We use nuclear gauge and electrical impedance testing methods on Jacksonville commercial roofs.

Saturated roof insulation is one of the most common and most costly hidden conditions on older Jacksonville commercial buildings. The membrane can appear serviceable from the surface while the insulation beneath is carrying significant moisture from years of undetected leaks, condensation infiltration, or failed drain sumps. Recovering a new membrane over saturated insulation traps the moisture, degrades the new insulation from below, and typically voids the new manufacturer warranty — the one outcome a recover project is supposed to avoid.

We perform moisture surveys ahead of any recover scope where insulation saturation is a plausible concern. For Jacksonville commercial buildings, that threshold is low: Northeast Florida's high annual rainfall, the frequency of tropical weather, and the prevalence of flat-roof drainage failures in Duval County's flat topography all create conditions that favor insulation saturation in aging roofs. Any building over 15 years old with a history of documented leaks or ponding water is a moisture survey candidate before a recover scope is committed.

Our moisture surveys use a combination of nuclear gauge testing and electrical impedance scanning, depending on the roof system. Nuclear gauge testing is membrane-agnostic and reads moisture density directly in the insulation layer. Electrical impedance scanning covers larger areas efficiently and flags zones for targeted core confirmation. Together they produce a moisture map that shows the extent and approximate depth of saturation — the data needed to decide between recover and replace.

Nuclear Gauge vs. Electrical Impedance: How We Choose

Nuclear moisture gauge testing reads hydrogen concentration in the substrate at discrete points, which correlates to moisture content. It is the most reliable single-point test method, membrane-agnostic, and effective on roofs with ballast, pavers, or multiple insulation layers. The limitation is throughput — a nuclear gauge survey on a large roof is time-intensive, which is why we use it in targeted mode: to confirm findings from the impedance scan and to verify moisture-core pull locations.

Electrical impedance scanning covers ground quickly on single-ply membranes — TPO, EPDM, PVC — and produces a moisture map across the full field. The scanner uses a conductive electrode that reads impedance variation in the substrate; wet insulation reads differently from dry insulation. The impedance scan is our primary large-area method for single-ply roofs. It does not work through ballast, pavers, or metal decks, and requires correlation with physical core pulls to confirm findings.

For Jacksonville commercial buildings with modified bitumen or BUR systems, the survey method depends on the system construction and the degree of prior repair history. Heavily patched BUR roofs can produce false impedance readings; nuclear gauge correlation is more reliable in those cases. We assess the roof system before selecting the survey method and will not commit to a method that is likely to produce unreliable data for the system type.

Moisture Survey Applications in Jacksonville

Recover vs. replace decision: The primary application. If the moisture survey shows less than 15 to 20% of the roof area carrying saturation, recover is typically a defensible scope — the saturated zones are removed and replaced, and the dry zones are recovered in place. If saturation exceeds 25% of the roof area, most manufacturers will not warrant a recover system over the existing insulation, and full replacement becomes the correct scope.

Insurance claim documentation: Post-storm moisture surveys in Jacksonville have been used to document the extent of storm-caused insulation saturation distinct from pre-existing saturation. Hurricane Matthew (2016) and Hurricane Irma (2017) both produced saturation claims on Jacksonville commercial roofs where the insulation was saturated by storm-driven water infiltration rather than long-term maintenance failure. A timestamped post-storm moisture survey with a pre-storm baseline comparison is the cleanest evidence for that distinction.