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Roof Moisture Analysis Services

Infrared, meter and core-based roof moisture analysis that maps wet insulation on commercial low-slope roofs, so repair and reroof scope rests on data.

Trapped moisture is one of the most common causes of premature roof failure. Our professional roof moisture analysis services help you identify and resolve these hidden threats before they cause costly structural damage, interior leaks, or warranty issues.

What is Roof Moisture Analysis?

Roof moisture analysis is the process of detecting and mapping moisture saturation inside a roofing system. Using tools like infrared thermography, electronic moisture meters, and roof core sampling, we identify wet insulation and compromised areas—enabling you to make informed repair or replacement decisions.

Why Choose Moisture Testing for Your Roof?

  • Detect hidden leaks and wet insulation before visible damage appears
  • Make data-driven decisions to repair, restore, or replace
  • Support warranty claims and insurance assessments
  • Validate contractor work or storm damage
  • Protect building occupants and valuable assets

Our Roof Moisture Services Include:

  • Infrared thermal roof scans to visualize hidden moisture
  • Electronic moisture meter surveys for real-time detection
  • Roof core sampling and lab analysis of insulation materials
  • Detailed moisture mapping and reporting with visuals
  • Post-storm inspections and insurance claim documentation

Explore how thermal scanning works in roof diagnostics at RoofingContractor.com.

The Survey Methods, and What Each One Measures

No single instrument reads moisture directly through a roof assembly. Each method measures something adjacent to moisture, which is why findings are cross-checked before anything is drawn on a plan.

Infrared thermography

An infrared scan records surface temperature differences as the roof gives up heat it absorbed during the day. Wet insulation holds that heat longer than dry insulation, so saturated areas appear as warm anomalies. Thermography identifies anomalies, not moisture; every anomaly still has to be confirmed with a meter reading or a core.

Nuclear and capacitance moisture meters

Meter surveys are taken on a grid so the readings are repeatable and comparable across roof areas and across future surveys. A nuclear gauge responds to hydrogen in the assembly; a capacitance meter responds to impedance nearer the surface. Grid readings work on roofs and in conditions where infrared results would be unreliable.

Test cuts and cores

Cutting and removing a small sample is the only method that confirms what is actually in the assembly: deck type, how many membranes are present from previous recovers, insulation type and thickness, and how saturated each layer is. Cores are placed to verify both suspect areas and areas that read dry, then patched.

What the Moisture Map Shows You

The deliverable is a roof plan with wet areas delineated and keyed to the readings behind them, along with core locations, photographs, and a description of the assembly as found. Because the wet material is measured and drawn rather than described in general terms, the map can be compared area by area and used as a baseline for a later survey on the same roof.

Assemblies and Conditions That Change the Approach

  • Lightweight insulating concrete and gypsum decks retain water and respond differently to meters than board insulation
  • Protected membrane assemblies, where ballast, pavers, or overburden sit above the membrane
  • Reflective, coated, or sprayed polyurethane foam surfaces
  • Roofs with several membranes stacked from earlier recover work
  • Metal and steep-slope assemblies, where a moisture survey is often not the right tool at all
  • Rooftop equipment, pavers, and photovoltaic arrays that limit access to parts of the roof

Where coverage is limited by any of these, the report says so and identifies which areas were not surveyed, so you are not reading the map as more complete than it is.

Using the Findings

How much wet material there is, and where it sits, drives different decisions: localized removal and infill, selective replacement of one roof area, a full tear-off, or whether a recover is even permissible given the quantity of wet material in place. The mapped quantities also support capital planning and give you documentation for warranty or insurance discussions. Survey work is coordinated through our Chicago, Milwaukee, and Minneapolis offices, and findings can be carried into design and bidding through our commercial roof consulting work.

What a Moisture Survey Does Not Tell You

  • It maps wet material; it does not establish the path water took to get there
  • It does not evaluate membrane attachment, wind uplift resistance, or remaining service life on its own
  • It does not address water entering through walls, windows, or below-grade construction
  • It does not determine whether a deck has lost structural capacity, which requires separate review

When the question is why the roof got wet rather than where the water is, that work belongs to a forensic roof investigation or a broader moisture intrusion analysis.

Preparing for the Survey

  • Roof plans, and any drawings from the original construction or previous reroof
  • Reroof, repair, and warranty records
  • Leak history with dates and interior locations, including stains that have since dried
  • Roof access arrangements, including after-hours access if an infrared scan is planned
  • Notice of any tenant, equipment, or safety restrictions on the roof

Unfamiliar terms in the report are defined in our building envelope and roofing glossary.

Concerned About Hidden Moisture?

Our moisture analysis services give you peace of mind. Catch the damage early and avoid costly surprises.

Schedule a Moisture Scan

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Common questions

How is roof moisture analysis different from a roof inspection?
A roof inspection evaluates visible condition: membrane, flashings, drains, penetrations and workmanship. A moisture analysis measures what you cannot see, using nondestructive survey methods and verification cores to map and quantify saturated insulation inside the assembly. Owners often need both, since a roof can look serviceable on the surface while holding significant trapped water below it.
Can you survey a ballasted or gravel-surfaced roof?
Yes, though the method changes. Infrared thermography is often unreliable through ballast and heavy gravel because the surfacing masks the thermal signature of wet insulation. Nuclear gauge readings taken on a grid, or removal of ballast in sample areas, generally give better results. The survey report states which method was used and what limitations applied.
Do you need to cut into my roof?
Test cuts are strongly recommended. Infrared, impedance and nuclear methods all identify anomalies rather than confirm moisture directly, so cores verify that an anomaly is actually wet, show which layers are affected, and reveal the real assembly and deck condition. Cores are limited in number, placed at representative locations, and patched before we leave the roof.
What percentage of wet insulation justifies full replacement?
There is no single threshold. The decision depends on how the wet area is distributed, the deck type and its condition, the age and remaining life of the membrane, warranty requirements for any recover system, and the owner's capital plan. Scattered saturation across the field usually points toward replacement; concentrated wet areas around a few details often do not.
What weather and site conditions does an infrared roof survey require?
Infrared scanning needs a dry roof surface, a day with enough solar gain to load the assembly, and a scan window after sunset while stored heat is releasing. Standing water, snow, recent rain, heavy wind or a cloudy day can postpone the work. Grid-based instrument surveys are less weather-dependent and sometimes substitute where scheduling is tight.
How do you decide which survey method to use on my roof?
The assembly decides. We look at the membrane and surfacing, the insulation type, whether lightweight insulating concrete or multiple old roof layers are present, and whether a coating has been applied. Some assemblies read well in infrared, others require grid readings with a nuclear gauge or capacitance meter, and some need a combination.
Can the moisture map be used directly in reroof bid documents?
Yes. Quantified wet areas shown on a scaled plan let a specification define exactly how much insulation is to be removed and replaced, and let bidders price unit rates for additional area found during the work. That reduces change orders and makes competing bids comparable, because every contractor is pricing the same measured scope.
Is a moisture survey worth doing on a fairly new roof?
It can be. Insulation is sometimes wetted during construction, and detail failures show up early. A survey on a new or recently completed roof documents conditions while a warranty and a contractor are still in place, which is a stronger position than discovering saturated insulation several years later during a reroof.