Water damage in Atherton properties rarely stays where it originated. It migrates through wall framing, saturates subfloor assemblies, moves along structural members, and collects in ceiling cavities — creating hidden moisture pockets that show no visible surface signs but create ideal conditions for mold growth within 48-72 hours. COS Water Damage Restoration's Atherton inspection team uses FLIR thermal imaging, calibrated pin-type and non-penetrating moisture meters, and systematic structural assessment protocols to map water migration through your property completely — before remediation begins or before you close on a purchase.
Here's what makes our Atherton inspection service more than a visual walk-through.
Thermal imaging is non-destructive and covers large surface areas quickly — making it the most efficient way to map water migration in a Atherton property.
Thermal imaging shows probable moisture — calibrated moisture meters confirm it. Our Atherton inspectors use both pin-type meters (direct reading in framing and structural members) and non-penetrating radio-frequency meters (surface reading through drywall and flooring) to take quantified moisture content readings at all thermal-identified locations. These readings are recorded at labeled sensor points and become the data basis for the written inspection report.
A verbal assessment is an opinion. A written report with instrument readings is documentation.
Both use cases are available in Atherton — contact us with your specific situation and our inspector will scope the right assessment.
Here are the specific inspection scenarios and assembly types our Atherton team handles.
When a water damage event has just occurred in a Atherton property — or happened within the last several days — our inspection maps the full extent of saturation while the moisture is still detectable by thermal imaging and direct meter readings. This inspection is the foundation of the remediation scope and the insurance claim documentation. Without it, remediation crews are guessing at what to dry, and insurance carriers are estimating on incomplete data. Our Atherton active event inspection captures the full saturation picture at the moment of peak detectable moisture — when the readings tell the most accurate story of what happened.
Pre-purchase water damage inspections in Atherton are scheduled on the buyer's timeline and the written report is available for the transaction file.
Post-remediation verification is an independent assessment — not a rubber stamp.
Properties in Atherton that had a water event 48 hours or more before inspection — or where a slow leak went undetected for an extended period — may present mold risk alongside ongoing moisture concerns. Our mold risk assessment inspection identifies the structural conditions that support mold growth: elevated moisture content in organic materials, elevated ambient relative humidity, and the presence of visible mold growth on surface or semi-concealed areas. This assessment determines whether a standard drying-focused remediation is appropriate or whether S520-standard mold remediation protocols need to be incorporated into the project scope.
Below-grade moisture in Atherton properties is underdetected and underlies a significant portion of structural issues discovered later.
Our Atherton inspection reports are formatted to the documentation standards that insurance carriers use to evaluate water damage claims in CA.


Same-day scheduling available for active water events. Pre-purchase inspections booked on your transaction timeline.
Systematic, instrument-driven, fully documented during the on-site session.
You understand what was found before you receive the written report.
The written inspection report — thermal images with annotations, sensor point readings mapped to a floor plan, water category determination, and recommended scope — is delivered within 24-48 hours of the on-site session, formatted for insurance, remediation, or real estate use as appropriate to your situation. We're available to answer adjuster or real estate agent questions about the findings.



"We were purchasing a Atherton home where the seller had disclosed a prior basement water event and claimed it was fully remediated. COS Water Damage Restoration's pre-purchase inspection found moisture readings in the wall framing adjacent to the original event area that were significantly above dry standard — indicating incomplete drying. The written report we received gave us specific sensor point readings that we used to negotiate remediation credit from the seller before closing. Without that inspection, we would have closed into a mold problem."
"We used the COS Water Damage Restoration Atherton inspection report to file a homeowner's claim for a water damage event. The adjuster reviewed the thermal image documentation and sensor point readings and approved the full remediation scope on first submission. The inspection report paid for itself many times over by eliminating the supplement process."
"We manage a portfolio of Atherton rental properties and COS Water Damage Restoration's inspection service is what we use every time a water event is reported, prior to any remediation starting. The inspection report maps the damage completely — it's what we give our remediation contractor as the scope of work and what we give our insurer as the damage documentation. Having a consistent, instrument-backed inspection process has eliminated the disputes we used to have about whether remediation was complete or whether the damage scope matched what we claimed."
COS Water Damage Restoration's certified inspection team serves Atherton and surrounding communities throughout CA. Call +1-844-499-0972 to schedule your Atherton inspection.
Whether you need inspection for an active event, a purchase, or post-remediation verification — our Atherton team produces a written, instrument-backed report. Call +1-844-499-0972 to schedule.
📞 Call +1-844-499-0972 — Schedule Atherton InspectionIICRC Certified · FLIR Thermal Imaging · Written Reports · Atherton, CA