Greetings everyone, I tried doing my homework on this but came up empty. In my 200+ year old farmhouse there is a layer of wood built right into the chimney. It's in the basement near the base of the chimney. (see pic)
Has anyone seen this before? Was this common way back then? Why would they do this??
The wood is now rotting, yet there is at least 30' of chimney above it.

There is no chimney access in the basement, but on the first floor, right above it, there is a fireplace.
Thanks for any feedback on this!