direct access to the help page back to home page access to sitemap access to contact form direct access to the site manu Accès direct au menu du contenu access to page content
direct access to the site manu Accès direct au menu du contenu access to page content

Search by business / application

direct access to the site manu Accès direct au menu du contenu access to page content

Humidity, cause of unhealthiness

Humidity, cause of unhealthiness
Excess humidity in living places has bad effects on occupants’ health as well as the environment.
Facilitating proliferation of mould, organic bacteria, mites, or cockroach, excess humidity can endanger healthiness of premises that are daily occupied, and consequently, the occupants’ health.

Unhealthy building?

Mushrooms (cryptogams)

Once installed, mushrooms grow quickly on any kind of base, if humidity and temperature favor them. Their presence may generate respiratory pathologies such as rhinitis, asthmas or infections due to the inhalation of toxins they make.


Mites measure about a quarter of a millimetre and especially like darkness and humidity. Their dejections, accumulated in carpets, textile floors, sofas or beddings are responsible for occupants’ allergies.


Humidity also triggers the degradation of building materials, paintings in particular, and produce lead exposure risk. In the dusts of obsolete housing, lead affects the occupants’ health, especially young children, via lead poisoning.

Polluted indoor air?

Mode of living and construction

Ambient air contains the humidity generated by showers, washing, clothes drying, cooking, plants and occupants themselves (For instance, a hot shower produces 2000 grams of water vapour per hour and an active person, 100 g/h).
Moisture can also come from linkage, infiltration, rising damp or migrating damp. Also, construction fault in walls or windows thickness gives rise to thermal bridges, where humidity sets up.
Buildings are more and more insulated to reduce air infiltrations and save energy. As a consequence, indoor air is often stuffy and not enough renewed. But, healthy air goes through its regular renewal.

Air quality diagnostic

The measurement of humidity content, temperature and CO2 in a room allows to determine if indoor air renewal is right.
On the other hand, the measurement of pollutants such as benzene or formaldehyde is now part of indoor air quality monitoring in public opened buildings.

Air management and energy

An appropriate system of indoor air management and the suppression of pollution sources such as wall moisture, some heating units or materials allow rehabilitating a building, while limiting its environmental impact.
page top

Recommanded products

Humitest for building

This moisture meter for building materials allows to measure water content of screed, floor screed, drywall, heavy concrete brick, brick…
Adjustable thanks to it optional sensors:
- Infrared surface temperature probe
- Thermo-humidity probe
- CO2 probe

Humitest MMS2

Four-in-one system: two-pin-contact moisture meter, in depth radiofrequency moisture detector, infrared thermometer, fast responding thermo-hygrometer.
- intuitive user interface with color screen,
- data logging,
- firmware upgradable,
- psychometric calculations,
- non-contact IR temperature probe with laser pointer.

Did you know?

Wall dampness treatment contributes to improve thermal efficiency of the masonry as well as indoor air quality.

Indoor air emissions

Health labelling of all the construction and decorating products from 2013

This IAQ labelling involves the manufacturers, the importers and the distributors of the products as well as contractors in France.