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Testo identifying damp walls and avoiding mould


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Testo identifying damp walls and avoiding mould

  1. 1. TS_Schimmel_MASTER 24.10.2012 10:04 Seite 1 We measure it. TESTOsolutions Identifying damp walls and avoiding mould When old buildings are restored, this is done with the best modern windows seal so well that the necessary air exchange intentions. The restoration is carried out in order to correct is hindered. The consequence: The air humidity increases, defective heat insulation and to avoid the increased energy forming the basis for the feared mould growth on walls and costs caused by this. This usually involves installing new ceilings. windows. While this solves the problem of the heat insulation,
  2. 2. TS_Schimmel_MASTER 24.10.2012 10:04 Seite 2 Identifying damp walls and avoiding mould How does mould develop? Isolating the causes Mould spores, the Once mould is in the building, the tenant initially supposes that seeds of the mould the damp is coming from the outside. Many legal battles have fungus, are every- ensued from the question of who is responsible for mould damage. where. In order to It is very difficult to determine who or what has caused mould: grow, they need – in the inhabitants or defective building construction? This is where addition to nutrients modern measurement technology comes in. Contractors, experts such as dust, plaster, and assessors usually have such measuring instruments in use, wallpaper or wood – and can carry out in-depth research into causes within a very short above all water. If, for time. instance, water has penetrated into the living quarters due to a burst pipe, or if the Measuring instruments Measuring instruments indoor air has been too damp over several days, mould spores for research into tenant- for research into related causes construction-related find ideal living conditions. The more humid the air, the better the causes mould can grow. The causes can be constructional defects, incor- Air thermometers Surface (contact) rectly implemented restoration or insufficient heating and venti- e.g. testo 610 thermometers lation, for example. In addition to the damage to health caused e.g. testo 905 by mould, the building substance is also permanently damaged. Humidity measuring Infrared thermometers Because of this, mould needs to be identified and eliminated in instruments e.g. testo 830 time. e.g. testo 625 Multi-function measuring Material moisture measring instruments instruments, e.g. for stone e.g. testo 635 and wood e.g. testo 616 Data loggers Thermal imagers e.g. testo 175 H1 e.g. testo 875 The relevant measurement parameters In order to detect moisture damage, the following measurement parameters must be recorded: Parameter Indicates... Air temperature …heating, ventilation and comfort in rooms. Air humidity …mould damage, and important indi- cator in technical building drying. Air humidity indicates how much water vapour is present in the air. Material …the surface temperature of the temperature material, and thus cold bridges, i.e. at which points heat is being drawn away from the material, allowing it to cool. Material moisture …the water content in mineral building materials. Measurements both at the surface (non-intrusive), as well as measurements in the material using an equilibrium humidity measurement (intrusive), are possible.
  3. 3. TS_Schimmel_MASTER 24.10.2012 10:04 Seite 3 We measure it. Detection of mould damage Detection of construction-related caused by tenants mould damage The following measuring instruments are suitable: The following measuring instruments are suitable: testo 610 for contractors in heating and sanitation testo 905-T2 for contractors in heating and sanitation Measurement of humidity and temperature in living Contact measurement for the determination of surface quarters, bathrooms and new buildings temperature on radiators or heating systems testo 610 is very small and handy, testo 905-T2 adapts itself per- and can be carried with you con- fectly even to rough surfaces, veniently at any time. testo 610 is achieving a high level of meas- simply held up in the room, and urement accuracy. This allows reliably, very accurately and at the the temperature on the surface of touch of a button records the air a wall, radiator, on valves or con- humidity, temperature and dew- nections in a heatings system, to point. be measured quickly. testo 625 for HVAC technology in buildings, quality as- testo 830 for contractors in heating, sanitation and air surance and production conditioning Monitoring ambient indoor conditions Non-contact determination of surface temperature testo 625 measures air humidity, testo 830 measures the surface temperature and dewpoint. In in- temperatures of walls, ceilings accessible points such as corners and floors using infrared tech- at ceiling height, the measurement nology. This allows points which values can be transferred wire- are too cold, at which humidity lessly over great distances by could precipitate, to be deter- the wireless module to the meas- mined and if necessary counter- uring instrument. measures taken. testo 635 for HVAC technology in buildings testo 616 for contractors in heating and sanitation Testing of building substance and climatic conditions in Monitoring material moisture in building materials, e.g. and on buildings after water damage testo 635 measures air humidity, testo 616 measures material temperature, material moisture moisture non-intrusively using a and U-value. The user can store contact probe in wood, screed, the measurement results in the in- cement and concrete at a depth strument, and later analyze and of up to 5 cm. The instrument sim- document them using the PC plifies the work of anyone who software. This makes uninter- must observe the drying process- rupted documentary proof possi- es of floors, walls and surfaces as ble. well as moisture damage. testo 175 H1 for use in industrial areas testo 875 for the building trade and for energy consultation Long-term monitoring of air quality and indoor climate Identification of construction deficits on buildings testo 175 H1 continuously records The thermal imager testo 875 temperature and humidity values shows deficits in materials and and shows the dewpoint in the components, such as cold display. This allows the indoor cli- bridges, insufficient air-tight- mate to be monitored over a long ness, cracks in the brickwork period, underlining the necessity or leaks, directly in the ther- for a systematic exchange of air. mal image in the imager dis- play. In the humidity mode, mould-risk areas are even shown up in red.
  4. 4. TS_Schimmel_MASTER 24.10.2012 10:05 Seite 4 Identifying damp walls and avoiding mould We measure it. When the cause is incorrect heating or ventilation Mould growth is in fact rarely caused by constructional deficits. bedrooms or bathrooms cool does not save heating costs. It actu- The cause is more often the living habits of the tenants, for ally increases them more than if the complete apartment were to example incorrect or insufficient heating and ventilation of the be continually heated. The higher the temperature difference living quarters. Because the humidity comes from the living quar- between the rooms, the greater the danger that condensation can ters themselves, caused by the people, who automatically give precipitate on critical areas. In addition to this, damp wall conduct off humidity to their surroundings. heat energy more quickly to the outside. The result is mould fungus In colder places such as and mildew. windows, this humidity leads to condensation, also referred to as “sweating”. For this reason, it Humidity caused in living quarters daily: must be extracted. Cause Humidity in litres Humans sweating/breathing approx. 1.0 In a four-person household, between 8 and 15 litres of water daily are given off into the ambient air in the form of vapour. The warmer Cooking 0.5 – 1.0 the room, the more water can be absorbed by the air. If this water Showering/bathing per person 0.5 – 1.0 msp/Q/10.2012 vapour now meets colder air, a part condenses back to water, Drying laundry – spin-dried 1.0 – 1.5 which then precipitates, especially in colder areas such as corners Drying laundry – dripping wet 2.0 – 3.5 of rooms, behind furniture and on outer walls. Heating the living room in the winter, and leaving lesser used rooms such as Houseplants 0.5 – 1.0 Lüftungsdauer, um die Wirkung der natürlichen verbrauchte Raumluft Lüftung durch Öffnen des Fenster bzw. gegen frische Außenluft Fensters bzw. der Tür Lüftungsdauer, um die Türstellung auszutauschen Wirkung der natürlichen verbrauchte Raumluft Correct heating and ventilation Lüftung durch Öffnen des Fensters bzw. der Tür Fenster bzw. Türstellung gegen frische Außenluft auszutauschen Wirkung der natürlichen Lüftungsdauer, um die verbrauchte Raumluft Lüftung durch Öffnen des Fenster bzw. gegen frische Außenluft Observing a few simple heating and ventilation rules in the end Subject to change without notice. Fensters bzw. der Tür Lüftungsdauer, um die Türstellung auszutauschen Wirkung der natürlichen verbrauchte Raumluft Correct ventilation: Correct heating: not only prevents the development Außenluft Lüftung durch Öffnen desFenster bzw. gegen frische of mould in your apartment, it Fensters bzw. der Tür Türstellung auszutauschen · Ventilate intensively several · Ensure as uniform a tempera- saves heating costs, protects the environment and ensures your times a day with windows and ture as possible in all rooms. own personal well-being. Lüftungsdauer, um die doors open wide. Wirkung der natürlichen verbrauchte Raumluft · Radiators must be freely ac- Lüftung durch Öffnen des Fenster bzw. gegen frische Außenluft Fensters bzw. der Tür Türstellung auszutauschen · No long-term ventilation with cessible in order for the heat Window and Window open windows only ajar, as this to be able to spread unhin- opposite door (or wide 4 to 10 cools the brickwork too dered. 2nd window), minutes much. · Close blinds and curtains at open wide 2 to 4 · Turn down radiators and/or night in order to avoid heat minutes thermostats. loss. · Ventilate intensively immedi- · Do not overheat the apart- Window half Window ajar ately after cooking or shower- ment. One degree Celcius of open 8 to 15 mi- 30 to 75 minutes ing. room temperature causes ap- nutes · Do not place furniture directly proximately 6% higher energy against outer walls, but pull costs. them a few centimetres away. · Never switch heating off com- · The warmer the outside tem- pletely, even during longer Window ajar, blinds closed perature, the longer the need absences. The rooms would but ventilation slits open for ventilation. Ventilate for a otherwise cool down too 45 to 120 minutes quarter of an hour on warmer much. days (over 12 °C), three min- utes suffice on days with con- tinuous temperatures below freezing. More information: Testo Limited For detailed information and answers to your Newman, Lane, Alton, Hampshire, GU34 2UR questions on our measuring instruments, contact our Telephone 01420 544433 us on 01420 544433 or visit e-mail