Successful using
the VTA method

Our testing devices are ideal for tree inspection using the VTA method.

Tree inspection information IML feed force gauges

VTA-Method
Visual Tree Assessment
according to Prof. Dr. Claus Mattheck

The VTA method is an internationally spread and acknowledgment method for tree inspection, hazard symptoms are construed, defects are confirmed and measured and criteria of failure are assessed. VTA helps to distinguish apparent hazardous trees from those that are really hazardous. This way safe trees are protected.

VTA gives information about the body language and the mechanics of trees and instructs you in the correct use of our test and measuring instruments.

Advantages of the VTA-Method

The VTA method is applied all over the world. The main focus of the VTA method is to understand the body language of trees. Sound or drilling techniques are used only for defect confirmation and surveying. Those who know the body language of trees can distinguish hazard trees from only apparent hazard trees and thus cut fewer trees while increasing traffic safety.

As a result, justified liability claims can be satisfied and unfounded ones averted. The VTA method is thus neither tree-friendly nor tree-hostile. In the event of damage, this method enables a largely fair judgment tobe reached.

The partial stages of the VTA-method

1. Symptom detection

Body language of trees
Growth defects
Appearance of the bark
Crown and leaves
Fungal fruiting bodies and their body language
Local environment of the tree

2. Confirmation of defects and measurement

Drilling Resistance Measurement (IML-RESI Systems)
Sound velocity measurement (IML Micro Hammer)
Measurement of the wood strength (Fractometer)
Annual ring analysis (IML Measuring Table)

3. Assessment of the defect

Criteria of failure for hollow or decayed trees
Criteria of failure for root damages
Criteria of failure for trees that are healthy but high trees (H/D ratio!)

4. Determination of further actions

Pruning
Mechanical aid (crow securing system, stilts,…)
Replacement of the tree

Measuring systems for the VTA-Method

Articles about tree inspection

16. August 2022

IML-Partnermeeting 2022

Last week we had the great pleasure of welcoming our international sales partners to the IML partner meeting in Wiesloch, Germany.First of all, a big thank you for the participants who have…

18. March 2022

Wood inspection confirms suitability of wood as building material in avalanche protection

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25. March 2021

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IML (Instrumenta Mechanik Labor) has developed a measuring gauge with which you can measure four parameters at once.

19. February 2021

Restoration of the Vineum in Meersburg – How Holzbau Schmäh impresses with the IML PowerDrill®

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5. December 2019

IML PowerDrill Basics: Online training series

We have created a video article series for you to learn how to use the IML-RESI PowerDrill® online.

23. April 2019

Drilling resistance measuring device for the professional inspection of trees and wood

With a drilling resistance measuring device like the IML-RESI PowerDrill® the internal structure of trees and woods can be inspected in an uncomplicated and gentle way. Rotten spots as well as hollow spaces and other defects in the wood can be detected …

1. January 2017

Playground Inspection

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1. January 2017

Construction Wood Inspection

Stable inside, makes the outside safe How sturdy is the wooden construction? The examination of construction timber in timber, bridge and pile dwellings reveals weaknesses and safety risks. We evaluate the inside…

1. January 2017

How healthy is the tree?

Tree Care & Tree Inspection Recognize warning signals early enough How healthy is the tree? In the context of tree care and tree inspection our instruments help to detect inner defects at…