Hi to all,
we would like to discuss a question about determining baseline and proposed building to meet LCA credit's requirements and meet the whole credits intent.
We work with the design team to set up the baseline and the entire approach to LCA credit. Our main question is - is the whole credit "only" a game of numbers and improvements to the proposed building so that it is better than the baseline, OR is it necessary to deal with REALLY built-in materials in the construction phase and compare this state (=built building) with the determined baseline?
I will give an example - we have a bill of quantities of the design-phase documentation of the object from which we created the LCA. We considered concrete reinforcement (steel rebar) with a small percentage of recycled components. By simply improving this percentage of recycled component from 60% to 90%, we have achieved more than 10% emission savings in LCA. But the question remains the same - is it necessary to prove that the construction actually used steel with a high proportion of recycled material, or is the whole credit a "paper-consideration" narrative?
The LCA credit is clasified as a construction credit, but there is no requirements for collectiong technical data sheets of really used materials in the building, so we are little bit confused about the credit's intent.
Thank you very much for your opinions and experiences.
(Skanska a.s., Sustainability consultant)