DGNB 2018 LCA creditsWhat has changed from DGNB 2015
Life Cycle Assessment credits in DGNB 2018 vs. DGNB 2015
What good is it if I use a certain building material in a structure but producing it generates more carbon emissions than I could ever save while operating the building?
Hermann Horster, Head of Sustainability, BNP Paribas Real Estate
DGNB has always focused on integrating Building Life Cycle Assessment in their requirements, and the 2018 version takes further steps into promoting Life Cycle Assessment as the path towards real sustainability and measurable improvements in carbon footprint and other environmental impacts.
The new version of DGNB for new construction has changed the approach to the LCA credit, and we are happy to announce that One Click LCA can be used to calculate the credit in DGNB 2018, and that it complies with previous versions as well.
The main difference between the former version and the new is that before there were two LCA credits and they have now been merged into one. ENV1.1 and ENV2.1 LCA credits are now a single ENV1.1 credit.
While the DGNB manual still assigns a consistent weight to LCA requirements, this simplifies things for the end-user. In addition to this, the manual introduces two new impact categories:
- “Abiotischer, nicht-energetischer Ressourcenverbrauch: Abiotisches elementares Ressourcenabbaupotenzial (ADPelements)
- “Wasserverbrauch: Net use of fresh water”
As water is now considered for this indicator, the LCA now includes also the category B7 – Water use.
ENV1.1 credit requirements
The ENV1.1. credit is worth 9,5% for most building types, but 9% for logistics, production, and commercial centers. The new reference values have been added to One Click LCA. The choice of data should be done by selecting data that matches the product used and is appropriate for the time of the study: general data for design LCA and product-specific EPDs for as-built LCA.
Product-specific EPDs must comply with EN 15804 and be valid at the time of purchase decision. This means that our users will be able to use EPDs while working with the DGNB tool.
If you are using an EPD, but not the exact product, a safety factor of at least 10 % must be applied. You can easily do this In One Click LCA by adjusting quantity upwards and documenting the safety factor in the comment field.
There are two methods for material assessment: simplified and detailed. The simplified method details how data needs to be captured and makes specific allowances. For example, all concrete in external walls can be reported as a single line item. The detailed method provides clear cut-off rules based on the EN 15804 standard, with a general cut-off rule of no more than 5 % of building mass and nothing to be excluded that represents at least 1 % of the building mass, with additional specific provisions for plastics, products from renewable raw materials and coatings.
If you use the simplified calculation method, materials, maintenance and their end of life must be multiplied by a factor of 1,2, but for passive buildings that use fewer systems, the factor can be reduced to 1,1.
The LCA credit in detail
The main credit is still based on performance but is now complemented with additional bonus sections. This is the structure:
1.1 Integration of LCA in the planning process (Integration von Ökobilanzen in den Planungsprozess) max 10 points
1.1.1 Do an LCA in the early phase of the planning process which has to include at very least typical values for construction and specific values for energy-dependent impacts. This must use information from at least three different planning disciplines e.g. structural or building physics and others. Share results with the planning team. 8 points.
1.1.2 Update results in the different planning phases; run simplified LCA latest in phase 4 (Leistungsphase 4). 3 points.
1.1.3 Expand LCA to differentiate energy consumptions in finer detail than required by law. 2 points.
2 LCA optimization (Ökobilanz-Optimierung) max 8 points
2.1.1 Do comparative full building LCAs for real options, in different design stages. Up to 6 points.
2.1.2. Do comparative component level LCAs for options, in different design stages. Up to 4 points.
3 Comparative LCA calculation (Ökobilanz Vergleichsrechnung) max 100 points
This is the core of the LCA, and where you perform comparative LCA for your building and choose reference building type from One Click LCA to get your points assessed.
4 Agenda 2030 bonus climate protection targets – max 30+5 points
4.1.1. Energy supply for building use is ensured with climate neutral means as per DGNB definition. 10 points.
4.1.2. Energy supply for building end users is ensured with climate neutral means as per DGNB definition. 10 points.
4.1.3. Carbon neutral building for phases from production, maintenance and end of life. 10 points. Additional 5 points possible if construction impacts are at least 50 % lower than the GWPK reference value.
5 Circular economy – no specific points
6 Avoiding high impact refrigerants (Halogenierte Kohlenwasserstoffe in Kältemitteln) – 2 points
Do not use any refrigerants with GWP factor higher than 150 kg CO2e.
One Click LCA will soon have DGNB 2018 specific reporting, sign up for our newsletter if you want to be the first to know. Bis gleich!
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