Strengthening and repair of timber elements

Reaction resin concretes or reaction resin mortars are used for strengthening, renovating and repairing timber elements, where applicable in combination with textile-reinforced rebars.

Regulatory framework

DIBt grants general construction technique permits (aBG) for strengthening and repair methods for timber elements, also in combination with national technical approvals (abZ) for the products used ('combined decision').

European Technical Assessments (ETAs) can also be issued for construction products that are used for strengthening and repair of timber elements. As yet, no European Assessment Documents (EADs) have been developed as an assessment basis for this product group.

The execution of each construction must be inspected by a recognised inspection body in accordance with the Directory of recognised testing laboratories, inspection and certification bodies (PÜZ-Verzeichnis), Part V, no. 8.

Application forms

National procedure

A national technical approval (abZ) and/or oder general construction technique permit (aBG) is granted upon application (see Model Building Code (MBO), Sections 16a(2) and18(2) and (4)). This also applies to amendments and supplements to, or renewals of existing approvals and/or construction technique permits.

No formal requirements apply. The following information is needed: name and address of the applicant, description of the product and/or construction technique and its field of use or application, type of decision required (new decision, amendment or supplement to, or renewal of, an existing decision).

Please feel free to use the template below.

Application for a national technical approval and/or construction technique permit (3 pages)

Version: January 2018; Application form

Application for amendment / supplementation / renewal of a national technical approval and/or construction technique permit (4 pages)

Version: January 2018; Application form

Guideline: How to provide drawings for national technical approvals and general construction technique permits (5 pages)

Version: July 2017

European Technical Assessment (ETA)

To start the ETA procedure, please submit the form below. We will then check if the prerequisites for issuing an ETA are met, i.e., in particular, if the product is not fully covered by an existing harmonised standard. If the prerequisites are met, we will check whether a European Assessment Document (EAD) covering the requested assessment scope already exists or still needs to be developed. If an EAD needs to be developed or amended, a complete technical file needs to be established before the procedure can begin.

Form for requesting a European Technical Assessment (ETA) (2 pages)

Last updated: 16 June 2022

  • abZ/aBG
  • Z = new decision | E = supplement | Ä = amendment | V = renewal | G = valid until
    Subject concerned Applicant Decision no. Validity
    from / to
    Polymerverguss zur Verstärkung von Holzbauteilen


    Meckfelder Straße 2

    99102 Klettbach

    Z-10.7-282 Z: 07.01.2021
    G: 17.12.2024
    Bauart zur Sanierung schadhafter Holzbauteile


    Am Mühlenwald 1

    33034 Brakel-Beller

    Z-10.7.2-41 Z: 18.09.2018
    G: 18.09.2023

Renée Kamanzi-Fechner
Head of Section – Plastics Construction, Facades

Phone +49 30 78730 -394
Email rka(at)dibt(.)de

Legal reference documents

Testing, certification, inspection