Ashley,
You have this in the wrong place. I don't know why no one has posted to direct you to the building forums, but I can do that.
You have posted in
permaculture design. Cob will be under building. Seems obvious, but if you are new, nothing is obvious! Good luck.
https://permies.com/forums/c/6/
that might be the link to the building forum. If not, it is just a matter of going to permies.com and looking for the forums, then for the building forums, then looking for cob. There may already be a
thread that is talking about your question. It's always good to read what's there, then ask your question.
good luck
Thekla