Fill the remnants of a chimney for thermal mass
A couple weeks ago, I demo’d a chimney that protruded into the unconditioned attic down to the floor joists.
I was thinking about the “fireplace” that’s still there and the two stories of brick that are inside of the envelope.
Would there be anything wrong with filling the chimney with sand to add thermal mass? Would there be a better material?
I know they’re not really viable in modern builds, but I’ll never forget this giant masonry heater I saw as a child. The fire had burned out and it was still so warm and nice.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part