I thought this was an interesting discussion on the ‘old basecamp’. Thanks for helping to migrate content @lori.ferriss
From @ianrobertson: One has to love low carbon bricks with high form factor envelopes 
**From Larry Strain ** Watershed block is a really great product. It’s basically a rammed earth block that get it’s strength from compression, so it uses 50% less cement. They make a thin cap block or paver that might work as a cladding material.
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From @jshiman
Watershed blocks (https://watershedmaterials.com/) might be worth looking into. A couple caveats - they are generally a CMU replacement (rather than brick) and manufacture is based in the Bay Area. However, they have a fairly high SCM content, and also gain strength from compression, not firing, so they avoid some emissions there as well.
Hope this helps!
Jeremy
**From @jonorato ** Thanks Jeremy, nice product!
On the east coast side, I know there is one company which does brick from 100% recycled material (post-industrial and post-consumer): https://www.greenleafbrick.com/
**From @stevet **
Some of the thin brick and block materials incorporate fly ash and other scms and are worth a look: for one: https://www.rcpblock.com/images/resources/sustainability/EPD-Splitface.pdf
**From @lori.ferriss ** On the CMU front in my neighborhood, Jandris already incorporates CarbonCure technology and SCMs into their process and has been working on other innovations that would allow further reductions to the cement content in their block products. Others in this group may have more information on that.
**From @philippe.st-jean ** A Portland cement-free thin brick product worth having a look at is: https://biomason.com
**From @cmd ** Or https://www.rammedearthworks.com/pre-cast-rammed-earth
**From Shanna Kelly ** The product below isn’t really an answer to your question and I think they are just in the research stage now, but an interesting read on the use of recycled drywall into block: https://magazine.wsu.edu/2020/01/31/the-era-of-green-reconstruction/