I recently removed ceramic tile off of my concrete subfloor (installed by the previous owner) and wherever the subfloor meets an exterior wall of the house, there is a 0.5-2" gap of missing subfloor. This is the case around the entire perimeter of the house, not just one wall or section. I was planning on filling this in with some SLU that says it will work with applications up to 2" thick in preparation for re-tiling but now I am wondering if that is the best solution. I tried searching for similar damage online, but I couldn't find anything similar. What is going on here and how do I best repair this?
You have a floating subfloor, which is good to avoid cracks.
It was installed with a gap on purpose, so not to touch the foundation.
The gap is usually 1/2 inch wide.
What ever you do, do not fill it with SLU or similar concrete products.
If you want to fill it, use backers rood.
You can then repair the chipped of parts.