NHBC 60 Year life span of materials

For those projects that are inspected by NHBC, it is started to be noticeable that the inspectors are requesting information concerning the expected life of materials that cannot be easily replaced which includes cavity barriers. I have contacted NHBC and they have confirmed this to be correct but have not indicated what cavity barriers achieve this. At present I have only be able to receive confirmation that a single cavity barrier at SideRise achieves the 60 year life span with one other achieving 25 years. Please can you check the cavity barriers being used on your projects and let me know of any that achieve a 60 year life span so I can share it with other projects.

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