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The Darr method is a scientifically recognised and highly accurate means of determining the moisture content of wood and other building materials. It is not without pride then that we at VDL are now able to announce that we are the only water restoration company in the whole of Germany that is able to use the Darr method to carry out this form of testing in our own in-house laboratory.

This new development is a logical conclusion of our line of thinking. It reflects the maxim of our company “One source fits all!”, around which we have built up our company. In the course of our company business activities we have continued to expand our range of services so that we can now boast the most accurate means available for determining the moisture content of wood and building materials.

You now no longer need to commission an external laboratory – trust us to provide you with an unmatched level of service and quality that saves you both time and money!

Although there are several factors which can have an effect on the time scale, in most cases you can count on us to get back to you with the first results within a week.

Please contact us to find out more about our new service. We would be most happy to provide you with more information on the Darr test method and how it can help to make your business more efficient.

How the Darr method works:
The Darr-Method involves taking a sample from a building component, which in most cases has been previously obtained by drilling into the building substance using a hollow steel tube, also referred to as a core drill. The sample is then vacuum-packed, labeled so as to provide information on the name of the place where the sample was taken and the date on which it was taken and then unpacked, weighed and placed in a drying out cupboard.

The building material is then dried until a weight balance has been achieved, i.e. there is no further weight loss between the measurements. The weight difference between the sample in its original state and the sample in its dried state equals the percentage of moisture.

The following formula will allow you to calculate the mass-related content of moisture.

M = 100% * (WW – DW) / DW

  • The sample is referred to as the wet weight (WW)
  • The weight of the dried sample is referred to as the dry weight (DW)
  • The moisture content is referred to as M

As the relative humidity of the surrounding air can quickly have an effect on the weight of the sample, it is crucial that the sample’s actual weight is determined as swiftly as possible.

Technical data:
Maximum drying temperature for wood: 104 °C
Maximum drying temperature for cement screed: 100 °C
Maximum drying temperature for anhydrite (e.g. plaster) screed: 40 °C

Trust in VDL – and trust in the Darr method – to provide you with accurate and valuable information that will give your building project – and your business – a boost.

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