MOISTURE SURVEYS
Roof moisture surveys are essential for detecting trapped moisture in roofing systems, which can lead to structural damage, insulation degradation, and costly repairs. The three primary methods used for these surveys are Infrared Thermography (IR), Capacitance Meters (Tramex ), and Nuclear Moisture Testing. Each method has its advantages and limitations, depending on the roofing material, environmental conditions, and survey goals.
HOW IT WORKS
1. Infrared Thermography (IR) Surveys
Infrared thermography detects temperature differences across the roof surface. When the sun heats the roof during the day, wet insulation retains heat longer than dry insulation. At night, the wet areas cool down slower, creating thermal patterns visible through an infrared camera
2. Capacitance (Tramex) Moisture Meters
Tramex moisture meters use electrical capacitance to measure moisture levels. The meter is placed on the roof, and it sends a low-frequency signal through the material. The response varies based on the material's moisture content.
3. Nuclear Moisture Surveys
Nuclear gauges use low-level radioactive isotopes to measure hydrogen content, which is a key indicator of moisture presence. The device emits neutrons that interact with hydrogen molecules in the roof. The rate of neutron reflection is used to calculate moisture content.
ADVANTAGES & LIMITATIONS
INFRARED
INFRARED
INFRARED
Advantages
- Non-destructive – No need to penetrate the roof.
- Fast and large-area coverage – Can quickly scan entire roof surfaces.
- Cost-effective – Less labor-intensive than other methods.
- Works well on flat or low-slope roofs with insulation beneath the membrane.
Limitations
- Weather-dependent – Requires favorable conditions (clear skies, minimal wind, and temperature variation between day and night).
- Limited penetration – Cannot detect deep moisture if covered by thick membranes or reflective coatings.
- Operator skill required – Accurate interpretation needs an experienced thermographer.
TRAMEX
INFRARED
INFRARED
Advantages
- Immediate readings – Provides instant moisture level data.
- Non-invasive – No need to damage the roof.
- Portable and easy to use – Works well for spot-checking suspected wet areas.
- Works on multiple roofing types – Effective on built-up, single-ply, and modified bitumen roofs.
Limitations
- Limited depth penetration – Typically measures moisture only a few inches deep.
- Affected by material composition – Results may vary based on roof membrane and insulation type.
- Best for comparative readings – Works well for identifying moisture trends rather than absolute moisture levels..
NUCLEAR
INFRARED
NUCLEAR
Advantages
- Deep penetration – Can detect moisture deeper than infrared and Tramex methods.
- Highly accurate – Provides precise moisture content readings.
- Not affected by surface conditions – Works regardless of temperature fluctuations or coatings.
- Effective on various roof types – Works well on roofs with multiple layers or dense insulation.
Limitations
- Requires trained and licensed operators – Due to the use of radioactive materials.
- Time-consuming – Requires taking multiple readings across the roof.
- More expensive – Equipment costs and regulatory compliance increase survey costs.
- Regulatory restrictions – Use of nuclear devices is subject to local regulations.
ADDITIONAL METHODS
UAV/DRONE INFRARED MOISTURE SURVEYS
UAV/Drone infrared surveys offer a fast, non-invasive way to detect roof moisture. Using aerial thermal imaging, this method efficiently covers large areas, reduces safety risks, and provides accurate data for informed decision-making.
Detect, Prevent, Protect—Schedule Your Moisture Survey Today
Let us know what you need help with:
- Inspection & Reporting Services
- Condition Assessments - Facade, Roofing, Waterproofing, Pavement
- Design Assistance & Peer Review of Construction Documents
- Roof Replacement Quality Assurance/Quality Control
- Due Diligence Surveys
- Water Leakage Investigations
- Storm Damage Assessments
- UAV/Drone Services
RUBICON BUILDING CONSULTANTS
Milwaukee, Wisconsin, United States
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