I am redoing my 30's era second floor bathroom and just removed glas tile over 3" of thickset mortar over wood floorboards. I have two questions: 1) The wood floorboards are set between the joists which are beveled to a peak and protrude up about 1-1.25 inches above the level of the floor. What do I use to fill in between the joists to level the floor? and 2) What layers should I use to bring the subfloor back up 2.5" so t is level with the existing thresholds?
(We are going to lay 1" hex mosaic tile)
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