Insulation between 2 slabs

Elodie, they are clear in the credit language that "the building interior is defined as everything within the waterproofing membrane." What kind of insulation are you using?I don't know about the EU, but in the U.S., most of the larger insulation manufacturers do third-party emissions testing. Quoting from the reference guide about acceptable testing standards:Projects outside the U.S. may use products tested and deemed compliant in accordance with either (1) the CDPH standard method (2010) or (2) the German AgBB Testing and Evaluation Scheme (2010). Test products either with (1) the CDPH Standard Method (2010), (2) the German AgBB Testing and Evaluation Scheme (2010), (3) ISO 16000- 3: 2010, ISO 16000-6: 2011, ISO 16000-9: 2006, ISO 16000-11:2006 either in conjunction with AgBB, or with French legislation on VOC emission class labeling, or (4) the DIBt testing method (2010). If the applied testing method does not specify testing details for a product group for which the CDPH standard method does provide details, use the specifications in the CDPH standard method. U.S. projects must follow the CDPH standard method.

I think GBCI has to make this call. Concrete is an air barrier, so I see where you are coming from, but it is not "waterproof" and is not a membrane. It may be that the credit wording is too limited to a specific type of assembly, so if you can make an argument that you meet the credit intent, you may have a chance. That said, personally, I'd still be looking for insulation and adhesives that meet the letter of the credit rather than the spirit.

Elodie,
I think you have a valid point, but you won't know unless you submit a CIR. I'm sure a reviewer would red flag your credit if you choose not to meet the exact credit language, but you could fill in special circumstances and see what response you get. I recommend a CIR or interpretation. I

Elodie—The sequence of construction may also be relevant.

For example, imagine pouring the bottom slab first, then placing the insulation on top of the slab, and finally, covering the insulation with more concrete. However, briefly, the insulation will be exposed to the interior of the building during construction. If this occurs after the building has been enclosed, there is greater potential for adverse effects from emissions from the insulation.

If you choose to request a formal interpretation, be sure to address construction sequence in your inquiry.