I was helping to redo the hearth on a 100 y/o fireplace, and as I pulled up the bricks and moved sand out of the way I noticed wood installed on an angle (subfloor?). The fireplace is in the middle of the room on a 100 y/o house built on stilts/pilings.
I've spoken with a few people but they don't know enough about fireplaces built this long ago.
Is the wood/subfloor suppose to be like this? It's a pretty big gap.