Originally Posted by
21boat
Just to add to ballengerb1
Check the flue system in the fireplaces to make sure the basement fireplace is not connected to any other fireplace(s) flue
Also the fireplace in the basement is more than likely the structural support for the upper fireplaces and the structural end needs to remain intact for obvious reasons. If there is a 4" brick/stone face on the basement fireplace and it doesn't go all the way to the ceiling to help support the hearth of a fireplace above it, then that veneer can be removed. You can brick shut the basement fireplace in the basement. Use brick to shut the opening not studs for moisture barrier. The separate flue for the basement fireplace needs to be closed of fin the top of the chimney to keep water from entering the chimney.
You can cap the flue with flashing or use mortar. To mortar it shut cut a fairly heavy gage square chicken wire bigger than the inside of the flue and bend it to compress inside the flue about 3" down from the top of the flue. Lay some newspaper on that and fill with mortar carefully to the top of the flue and above the flue in the middle of the flue in order to slope for water runoff.
Signed 21 Boat
If I Helped To Answer Your Question Please Rate My Answer