The existing flooring throughout the house is 1 1/2″ wide x 3/4″ thick t&g oak. I removed a wall between the kitchen and an adjoining room and would like to continue the oak flooring into the kitchen. I have salvaged flooring that matches the existing 100 year old oak flooring but some of the tongues and bottom lips of the grooves are missing. I was considering using glue in addition to nailing through the tongue to secure it as I don’t want to face nail it. The subfloor is 3/4″ shiplap laid diagonally. Has anyone have experience with a problem similar to this?
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I haven’t but I’d be sure to screw down the subfloor. If skinning the subfloor With 1/2” ply throws your Height off, then I would go ahead as you plan.
One option would be to use a spline system for the damaged boards. To do that you would rip the remaining pieces of tongue from the boards, then use a router to put in a groove that matches the groove on the other side of the board, and in the other boards. Then you make spline stock to fit in when two grooved faces meet. For the pieces missing the bottom of a groove you could do the same, but it would mean cutting off the top of the groove, to make a flat edge to route, and this would make those boards a bit narrower. You can decide if that's a problem. In a new installation it might be handy at the wall.
I would try to avoid glue as it would make it very difficult to remove boards in the future, but these boards probably won't be reused a third time.