Fixings bonded to the roof waterproofing
For penetration-free fixing of photovoltaic systems or fall protection to the roof, the fixings can be bonded or welded to the roof waterproofing membrane. The roof waterproofing thus takes on a structural role in the transfer of loads, for which it is not designed. As a matter of fact, the roof waterproofing as such is not a load-bearing element. Furthermore, there are no generally recognised design values for welded or bonded joints.
Regulatory framework
There are no conclusive technical rules for fixings bonded to the roof waterproofing.
Therefore, DIBt grants national technical approvals (abZ) for the corresponding products in combination with a general construction technique permit (aBG) for the design and execution.
The regulatory provisions set out that the systems and elements must be secured against falling due to wind action. If the systems are secured against uplift by ballasting, they may be secured against falling as a result of horizontal displacement by constructive means – e.g. through installation of a parapet or planks at the edges or through back-ties to components subject to uplift forces.
National procedure
To prepare an abZ/aBG for your construction product, we need an application from you. We recommend that you contact us prior to doing so. Feel free to send us your enquiry informally via email to dibt(at)dibt(.)de or to the competent technical contact listed in the top right.
For a first assessment, please send us the following information:
- Description of the construction product and its intended field of use
- e.g. material, configuration, number of sizes, variants, dimensions
- e.g. use in walls, ceilings, interior construction, building services
- Description of the construction technique and its field of application
- e.g. design of walls, ceilings, elements, etc., and interaction of components
- e.g. application in foundation engineering, reinforced concrete construction, building insulation; as load-bearing or non-load-bearing component; under static and quasi-static loading; fire exposure; other environmental exposures
- Information regarding impact on regulatory concerns
- in particular structural integrity, fire protection, health and environment protection, sound insulation as well as thermal performance
- Explanation of need for an abZ/aBG
- Do you significantly deviate from the Technical Building Rules?
- Or do neither Technical Building Rules nor generally recognised technical rules exist?
- Contact details
- preferably email address and/or telephone number, as well as name, organisation/company, and postal address
We will then contact you to clarify the next steps.
If you already hold a DIBt approval and/or construction technique permit and wish to apply for an amendment, supplement, or renewal, please use the form provided below.
- pdf-Datei Application for amendment / supplementation / renewal of a national technical approval and/or construction technique permit (4 pages ) Last updated: 10 April 2024; Application form
| Subject concerned | Applicant | Decision no. |
Validity
from / to |
|---|---|---|---|
| Befestigungssystem für Solaranlagen "RENOLIT ALKORPLAN Solar" zur Verwendung auf der Dachabdichtungsbahn "RENOLIT ALKORPLAN F" | RENOLIT Belgium NV Industriepark de Bruwaan 43 9700 OUDENAARDE BELGIEN | Z-72.1-1 |
Z:
06.12.2024 G: 13.12.2029 |
| SUNOVA Befestigungssystem für Solaranlagen auf mechanisch befestigten Dachabdichtungen | Gehrlicher Solar Connect GmbH Feldkirchener Straße 2 85540 Haar b. München | Z-72.1-15 |
Z:
11.07.2022 G: 11.07.2027 |
| SOFLATECH PV-EPS-Trägersystem zur Befestigung von Solaranlagen auf Dachabdichtungsbahnen | Soflatech GmbH Ikarusallee 16 30179 Hannover | Z-72.1-3 |
Z:
05.07.2023 G: 27.07.2028 |
| ABS Lock OnTop Max - Anschlageinrichtung, verschweißt auf der Dachabdichtung zum Anschlagen einer persönlichen Schutzausrichtung | ABS Safety GmbH Gewerbering 3 47623 Kevelaer | Z-72.2-4 |
Z:
21.06.2019 Ä + V: 17.07.2024 G: 22.06.2029 |