Technical commission 1 – Timber – handles the following matters:

  • Biotic and abiotic damaging effects
  • Timber preservation in building construction, selection of timber, structural timber preservation, chemical timber preservation, weather protection
  • Remedial timber preservation
  • Waste timber
  • Decontamination of polluted timber
  • Repair work, completion of missing timber sections, timber repair, structural upgrading of timber
  • Coatings, processing and coating of lead contaminated timber


This technical commission participates in the expert discussion of subjects such as timber in general, timber-based materials, structural timber preservation, preventive and remedial timber preservation, use of waste timber, completion of missing timber sections, repair and upgrading as well as standardization projects. The competencies of the members of this technical commission are bundled through the compilation of WTA codes of practice covering the abovementioned subjects. If necessary, the latest topics are promptly handled by the existing or ad hoc working groups. Other objectives of this technical commission are the transfer and sharing of knowledge. Technical commission 1 addresses all interested circles of experts on the subject of timber and timber preservation and thus bundles technical competencies in this area. This technical commission is the symbiosis between science and practice in the construction industry.


Dipl.-Ing. Gero Hebeisen

1. Stellvertreter
Dipl.-Ing. Ekkehard Flohr
Ingenieurbüro Ekkehard Flohr GmbH

Lutz Parisek
Parisek saniert GmbH + Co.KG

Wolfgang Böttcher
Büro für Holz- und Bautenschutz

Number of members: 88

Technical Commission meeting 2021

The meeting is planned for 23.08.2021 at the Gasthof Jägerhaus in Fulda.


Technical commission 1 will continue to deal with the topics of timber, derived timber products and timber preservation in the building construction and will take up and deal with all related topics. The technical commission will continue to pursue its goal of knowledge transfer for practice and will combine the technical competence in the unit and in the working groups and make the knowledge summarized in fact sheets available to the professional world and practice for application.

Future topics

  • Modified woods
  • Timber constructions, extensions, finishing
  • Use of thermowood
  • Energy, resource management, planting and harvesting
  • Built-in and freely weathered timber
  • Infrastructure structures
  • Building physics topics through use and application
  • Fire protection measures and requirements
  • Digitization Wood 4.0

Working Groups

The following working groups are or have been concerned with the work on recommendations.

Current working groups

Working group 1.1:

Dry rot

Working group 1.2:

Structural timber preservation

Working group 1.3:

Hot air processes for control wood pests

Working group 1.4:

Sampling and diagnostics

Working group 1.5:

Waste timber

Working group 1.6:

Coating of timber in existing structures

Working group 1.7:

Completion of missing timber sections

Working group 1.8:

Special procedures in timber preservation

Working group 1.9:


Working group 1.10:

Supported timber

Working group 1.11:

Mould on timber

Working group 1.12:

Reed-thatched roofs

New working groups are planned to deal with the following topics.

Planned working groups

Timber preservation in a Europe-wide comparison

History of timber processing


Wood pests

Anatomy of timber




The following recommendations have been published by the Technical Commission "Timber and Timber Protection" :

1-1    Edition: 06.2008/D

Thermal processings for control of insects attack on wood in buildings

1-2    Edition: 03.2005/D

Dry rot – identification, living conditions, preventive measures, controlling chemical measures, list of performance

1-4    Edition: 12.2000/D

Construction protection of wood on historical buildings – Part 2: Roof truss

1-6    Edition: 10.2013/D

Sample taking on Wood – Research on fungi, insects, wood preservatives, wood age and wood type

1-7    Edition: 09.2012/D

Wood supplement

1-8    Edition: 11.2013/D

Disinfection of  timber, contaminated by wood protection compounds, Part 1: Assessment and Risk evaluation

1-9    Edition:11.2013/D

Disinfection of timber, contaminated by wood protection compounds, Part 2: Procedures for reduction of contamination

1-10  Edition: 09.2015/D

Special measures to control and prevention of wood-destroying insects and fungi in wooden material

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