A damp meter that measures damp

How to Measure Damp in Walls?

Key Takeaways

Importance of Measuring Damp in Walls: Measurement of damp in walls is crucial to understanding the extent of the problem and estimating the time required to fix it. It aids in creating a plan of action and selecting the most suitable treatment for the issue. Role of Moisture Meters: Moisture meters, also known as damp meters, are popular tools for measuring damp. They assess moisture levels in various materials, including concrete, wood, wallpaper, and drywall. How Moisture Meters Work: They provide quick and precise readings, often with illuminative colour indicators for different moisture levels. Pin-type meters use electrical resistance, while pinless meters work on electrical impedance, ensuring non-destructive moisture level evaluation.   Measuring damp in walls or on any other area of the house is really important. Why? Simply because it gives an idea of the extent of the problem and provides a rough idea about how long it will take to get it fixed. Also, measuring damp paves the way for creating a plan of attack for damp issues and helps in deciding on what type of treatment will be best suited. Therefore, the significance of measuring damp in walls is very high. However, how is it done? What are the ways to do it? Well, there are many, but the most popular one is the use of a Moisture Meter, a.k.a. Damp Meter. A moisture Meter is a device or instrument that can assess the capillary moisture content levels when it comes in contact with various surfaces. The output result is in the form of readings that represent dryness, moderate moisture, or high moisture levels. Let's have a detailed look into how a moisture meter actually helps measure the dampness in walls. A damp professional checking for humidity level in the house  

What Exactly is a Moisture Meter?

Moisture meters, also known as moisture detecting devices, serve an essential function in determining the water content of material samples, allowing an assessment of whether the current moisture levels are acceptable or require alteration. Given the possible hazards involved with damp-induced damage, property inspectors use these sophisticated tools with a keen eye for determining moisture levels. Concurrently, craftsmen, particularly those involved in furniture creation, use these tools to maintain stringent quality standards. Moisture meters' intrinsic complexity is seen in their use of digital displays, which allows for the gathering of quick and precise readings. These data, in turn, are helpful indications of any noticeable inconsistencies in moisture levels when compared to pre-established criteria. Moisture meters can be used to evaluate various materials, such as:
  • Concrete
  • Wood
  • Wallpaper
  • Drywall
Excessive moisture levels can cause material deterioration, emphasizing the importance of taking meter readings on a regular basis. Moisture meters have become vital tools for professionals working in a variety of industries, including property care, wood fuel management, and stove installation, among other typical applications. A damp removal specialist checking damp in a house with a damp meter  

Working on a Moisture Meter

Moisture meters are valuable instruments for determining moisture levels in a variety of materials. Moisture meters vary in design, with some producing analogue readings and others providing a more contemporary digital interface. These meters often have illuminative colour indicators that indicate various levels of moisture detection. The emerald light denotes dryness, the amber hue indicates moderate moisture, and the red brightness indicates very high readings of moisture levels. As previously stated, electrical moisture meters come in both pin-type and pinless forms. The pin-type variation works on the notion of electrical resistance, allowing for an essential measurement of electricity moving through a particular medium. This sort of meter accurately distinguishes between surface and ambient material conditions; however, it has the caveat of potential material damage. In contrast, a pinless or non-invasive moisture meter works on the basis of electrical impedance. This innovative design allows for exact readings without the risk of material damage, demonstrating its fineness in non-destructive moisture evaluation. A professional checking the humidity level in a house  

Various Types of Moisture Meters

There are two central moisture meters: pin and pinless. Each type is designed for specific purposes, catering to the user's needs in measuring moisture content.

Pinless Moisture Meter

The pinless moisture meter, also known as a non-damaging meter, uses an innovative sensor pad that precisely emits a nuanced electromagnetic signal when in contact with materials, allowing for a thorough assessment of moisture levels. These cutting-edge meters determine the precise moisture content without the need for intrusive entry or material damage. Distinguished by their technical capabilities, the wide variety of pinless versions offered can detect moisture levels at depths ranging from a painstakingly calibrated 0.75 to a substantively profound 1.5 inches.

Pin-Type Moisture Meter

Pin-type moisture meters are outfitted with 2-4 tiny steel probes that are ingeniously constructed to penetrate materials and accurately monitor moisture levels. The probing technique entails the purposeful cycling of current between these probes, with the ensuing resistance complexities providing a nuanced assessment of moisture content. Notably, these meters have a higher capability for depth measurements than their pinless equivalents. Their applicability extends to determining moisture levels in a variety of materials, including concrete, plaster, wood, and plasterboard, demonstrating sophisticated moisture evaluation capabilities. A professional checking the ventilation level  

Measuring Damp in Walls with a Moisture Meter

To get reliable measurements, calibrate the moisture meter rigorously before beginning any data collection. The calibration technique varies depending on the type of meter being used. Nonetheless, the vast majority of pinless meters may be calibrated using a purpose-built calibration block or kit. Following the rigorous calibration of the instrument, the optimal use of a moisture meter is dependent on the subtle features inherent in the individual type of meter being used. To effectively use a pinless moisture meter, follow these steps:
  1. Surface Preparation: Remove any residue or standing water from the surface.
  2. Meter Application: Press the meter against the surface and wait for the reading to stabilize.
  3. Record the Moisture Content: Take note of the moisture content and percentage value reading.
  4. Repeating the Process: Change the meter's position to gather additional readings and create a comprehensive understanding of overall moisture content.
For a pin-type moisture meter, the procedure is as follows:
  1. Moisture Meter Setting: Select the appropriate moisture meter setting for the material type you are measuring.
  2. Positioning of Moisture Meter: Align the moisture meter so that the pins are perpendicular to the substrate surface, and insert them as deeply as possible into the material.
  3. Reading: Record the reading, specifying whether it is a percentage or reference measurement.
  4. Repeating the Process: Conduct readings in various areas of the material, focusing on high-risk zones, such as the exterior of windows, during wall assessments.
  Indoor damp testing of a house

Moisture Meter for a Wall

Moisture meters, which are essential instruments in construction, allow for the precise monitoring of moisture levels within various wall types. These very portable detectors detect the presence of rising or penetrating moisture in foundational walls, beams, and floors, giving crucial information about possible structural weaknesses. Furthermore, their value extends to determining the ideal dryness of surfaces prior to the start of careful wallpapering and tiling projects, guaranteeing a complete and thorough approach to construction.  

Moisture Meter for Concrete

Concrete moisture meters are ideal equipment for measuring moisture levels in a wide range of construction materials. Their functionality includes precise moisture measurements in concrete floor coverings, beams, slabs, and other building materials. These meters are very durable, with automatic temperature correction built in to assure accuracy. Furthermore, they allow for spot tests on specific spots of a concrete slab, increasing their versatility in construction applications.  

Moisture Meter for Wood

Moisture meters are valuable instruments for estimating wood moisture levels, albeit their accuracy varies depending on the quality and brand of the wood moisture equivalent meter used. The rigorous oven-dry test, which involves carefully weighing wood both before and after a cycle of oven drying, can be used to determine accuracy. A high-quality moisture meter provides not only consistently precise readings but also adaptability, making it useful in a wide range of environmental measuring applications. Its scope includes the detailed assessment of moisture content in a wide range of objects, from the intricate details of wooden furniture to the structural components of timber frames.  


Look, there might be other ways to measure damp in walls, but the most common one is to use a Moisture Meter or a Damp Meter. It is one of the most accurate methods that damp removal experts use. Although the accuracy of results depends on various factors such as the type of surface, the quality of the meter scale, and how maintained the meter actually is, the margin of error for high readings is still 0.1%, which is almost negligible. To avoid the mistakes, the meter must be calibrated before taking any readings. The most intriguing part about the moisture meter is that it works on a variety of surfaces such as plaster, wood, soil, concrete, etc., therefore making it one of the most highly used methods for measuring damp.  

What percentage damp is acceptable in walls?

The acceptable percentage of damp in walls varies depending on the type of construction and materials used. Generally, a moisture content level of 15-20% is considered acceptable. However, it's crucial to identify the source and type of damp, as different situations may require different remedies.

Is there a meter for testing damp walls?

Yes, there are meters specifically designed for testing damp walls. These devices, known as damp meters or moisture meters, use various methods, such as pin or pinless technology, to measure the moisture content in materials. Pin meters penetrate the surface with probes, while pinless meters use electromagnetic signals to assess moisture levels without causing damage to the material.

How do I check the damp level in my house?

To check the damp level in your house, you can use a wet meter by following the manufacturer's instructions. Ensure the meter is appropriate for the type of material you are testing, as different meters may be designed for use on wood, drywall, or masonry. Target areas prone to damp, such as basements, bathrooms, and around windows or doors, and take multiple readings to get a comprehensive assessment.

How accurate are damp meters?

The accuracy of damp meters can vary, and their effectiveness depends on factors such as calibration, proper usage, and the type of material being tested. Pin meters may provide more accurate damp readings, for certain materials, but pinless meters are preferred for non-destructive testing. Regular calibration and adherence to manufacturer guidelines can help maintain the accuracy of damp meters, ensuring reliable results when assessing moisture levels in walls and other surfaces.

Table of Contents

Sam Fitzgerald – CSRT Damp Surveyor

Sam Fitzgerald – CSRT Damp Surveyor

Author – CSRT Damp Surveyor
Sam is a highly qualified and seasoned damp surveyor with over ten years of specialised experience. With a strong academic foundation in building surveying and numerous professional certifications, Sam has established himself as an authority in the field of damp diagnosis and remediation.

At Damp Surveyors Ltd, Sam applies his extensive knowledge to help homeowners across the UK address and solve their damp issues effectively. His approach combines cutting-edge techniques with a commitment to honest, client-focused service, ensuring that every survey and recommendation is tailored to the specific needs of the property.

As a thought leader, Sam’s insights into damp prevention and treatment have been featured in industry publications, underscoring his role as a trusted expert dedicated to maintaining the integrity and comfort of your home.

Testing device for measuring dampness in a house


At Damp Surveyors Ltd, we stand out as your premier choice for damp survey services in the UK. Our commitment to excellence and customer satisfaction sets us apart. Here’s why you should choose us:

  • Exclusive 3 Free Quotes: We offer a one-of-a-kind optional service where you not only get our top-notch damp survey but also receive 3 free quotes from vetted local companies, giving you peace of mind by saving you thousands on getting the most competitive quotes, and also time researching and contacting other reputable companies.
  • Knowledge and Experience: We provide unmatched knowledge to every survey we conduct thanks to our team of seasoned professionals and years of industry experience. This guarantees accurate assessments and practical solutions.
  • Nationwide Coverage: Whether you’re in a bustling city or a rural area, our services extend across the UK, making us accessible wherever your property is located. Choose us for nationwide reliability and excellence.

Choose Damp Surveyors Ltd as your reliable partner for all-inclusive survey needs. Our top concerns are the health and safety of your property, and we are committed to providing outcomes you can trust.

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