1. Home
  2. Applications
  3. Revealing the invisible

Revealing the invisible

Reliable detection of moisture and water damage in buildings.
With thermal imagers from Testo.

The existence of moisture and water penetration in buildings has far-reaching effects on their value, structure and the health of their occupants. Particularly in times of more extreme weather events such as heavy rain, storms or monsoon rains in Asia, for example, this problem is exacerbated. In this context, infrared thermography is proving to be a valuable tool for building inspectors and renovation specialists to help them identify and resolve damp problems from a variety of sources (see right).

Not every case of moisture in walls is due to a burst pipe. Damp walls and ceilings can also be caused by water penetration (e.g. leaking roofs) or rising damp. Damp damage can also be caused by blocked drains or inadequate drainage.

Using thermal imagers from Testo allows you to reliably identify the cause of rising damp or rainwater ingress before these problems result in any serious damage.

Ground moisture (groundwater)

Ground moisture (pressure)

Seepage water

Driving rain

Heavy rain

Damage to the roof

Defective guttering

Examples of moisture and water damage

Water intrusion

Roof leakage

Rising damp

What should I look out for when choosing the right thermal imager?

High thermal sensitivity (NETD) for detecting the slightest differences

Precision-adjustable temperature interval (span) for higher-contrast imaging

High infrared resolution for optimal image quality

Our recommendation: testo 883-1

  • Very good NETD of

  • Temperature interval adjustable up to 1 K

  • IR resolution of 320 x 240 pixels
    (with SuperResolution 640 x 480 pixels)

  • Wide-angle lens for large field of view in confined spaces

  • Manual focus for sharp thermal images

How to successfully thermograph damage caused by penetrating water and rising damp

To analyse thermal images of water and moisture damage, you need a high-resolution camera with high thermal sensitivity (NETD) and a finely adjustable temperature interval.

Only inspect possible external damage in dry and calm weather. For flat roofs, take the photos in the evening when the damp areas have warmed up in the sun.

Especially in the case of damage caused by rising damp, reduce the temperature interval (span) to see the difference between dry or warmer and damp or colder material. Also use moisture meters for support.

Compare and document the thermal and visual images. Analyse the thermal images using software and create a report with causes and solutions.

Measure the drying progress after the renovation.

Find the right thermal imager for every requirement


Need some advice? We’re only a click away

Contact request

At Testo, you’ll also find the ideal humidity measuring instrument for your multi-point measurements

Please provide a blok property to the StoryblokComponent

More information about building thermography

Brochure building thermography

Find out more

testo 883 brochure

Find out more

Brochure testo 865/868/871/872

Find out more

Our services


Do you have any queries, or would you like a personal consultation?
We would be happy to help you.

Customer services

If you experience any malfunctions, please send in your measuring instrument with a brief description of the fault. Please also give us your telephone number for any inquiries. Normally, you’ll get your measuring instrument back within one week.


Our subsidiary company Testo Industrial Services supports you daily in ensuring quality while always adhering to the relevant norms and guidelines. You get all the services you need from one provider.