My room is built on a concrete slab. So there are no joists or nothing under the floor that I can look at. I am sharing 2 pictures from each side of the fireplace.. Not sure if I can just fill this gap or if I need to call a professional.
![[Hearth.com] Brick hearth separating from main fireplace structure.](https://www.hearth.com/talk/data/attachments/323/323372-8f5d93862713742a619b7fe82f63187b.jpg?hash=nPQU3IK7QO "[Hearth.com] Brick hearth separating from main fireplace structure.")
![[Hearth.com] Brick hearth separating from main fireplace structure.](https://www.hearth.com/talk/data/attachments/323/323373-51b4fb80bcd1be684ce5b4a44fbf2702.jpg?hash=6kBJ3rMgKA "[Hearth.com] Brick hearth separating from main fireplace structure.")
![[Hearth.com] Brick hearth separating from main fireplace structure.](https://www.hearth.com/talk/data/attachments/323/323374-bd627bca13434641c8385dde824aeae0.jpg?hash=U-cgEgTnCe "[Hearth.com] Brick hearth separating from main fireplace structure.")
![[Hearth.com] Brick hearth separating from main fireplace structure.](https://www.hearth.com/talk/data/attachments/323/323375-0c81439371141db069acf52f70b4f0b9.jpg?hash=SKRppOBAy3 "[Hearth.com] Brick hearth separating from main fireplace structure.")
Brick hearth separating from main fireplace structure.
- Thread starter Granny74
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Looks like it was not done properly to start with. It should be connected with the hearth floor in the fireplace.
You say the hearth is built on the concrete slab/floor. I'm guessing fireplace is on an outside wall. If you go outside can you see the footer for the fireplace itself? Do you have a level? Place the level on the hearth or the floor near the hearth, then place the level on the fireplace. Something moved you have to figure out what moved and why before filling gap.
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