Secondary building material cycles in the Assessment System for Sustainable Building (BNB) as a contribution to resource-efficient construction

Project duration
12/2018 - 03/2020

Funding organization
Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (BMUB), Research Programme Zukunft Bau SWD

Project partners
Hildegund Figl, Dr. Caroline Thurner IBO – Austrian Institute for Healthy and Ecological Building GmbH, Vienna 
Prof. Dr.-Ing. Isabell Nemeth, Ansbach University of Applied Sciences
Dipl-Ing. Robert Kellner, ak architekten, Munich

The BNB credit 4.1.4 "Deconstruction, separation, recycling" (BNB 4.1.4) aims to optimize buildings already in the planning process in such a way that at the end of their life cycle they contribute optimally to the recycling of building materials. Another objective is to leave as little non-recyclable waste as possible. In the current version of the KSB 4.1.4 (version 2015), buildings are evaluated using a component approach according to the complexity of deconstruction and separation, and the recycling potential of the component layers. In the associated evaluation tool, pre-evaluated sample components are provided, which the auditors can use for self-assessment of the construction to be evaluated. The self-assessment is then verified by the conformity body by means of a test based on the dual control principle.

The aim of the project is to develop a quantifiable, scientifically based evaluation system for the BNB credit (KSB) "Deconstruction, separation and recycling", which no longer requires individual testing by the conformity body. Important preliminary work was already carried out in the previous project as well as in other research projects of the BBSR. This preliminary work is consolidated into one approach in the present project.

Project Team:
Patricia Schneider-Marin, 
Janina Stemler