Hello!
In our newly purchased terraced house, we removed an old closet that was in the entrance/hallway. Behind it, in one corner, there was a gap in the wall. The hallway, as I understand it, was not originally built with the terraced house but added later as an extension. The gap is 5 cm wide and about 2.20 cm high.
In the gap, there are 5-6 deeper holes about 5-7 cm deep, otherwise, it's about 1.5 cm to fill.
I would like to fill it in but don't know what material I should use.
Will sand filler not cover such depth? Should it be some joint material? or husfix?
