Laying one floorboard

[UsernameAlreadyTaken]

Any advice on the best way to do the following?

I have removed a load bearing wall between kitchen and dining room. the dining room has old pine floor boards. The kitchen floor was dug up, concreted and screeded and finished with tiles.

Where the wall was there is now a gap about 1500mm long, 40mm deep and approx 6 inches wide. The bottom of the gap is a course of bricks which the builder has damp proofed, however I am now left with a gap I need to fill.

I would like to get a reclaimed oak floorboard and use it to fill the gap.

I am guessing that the best way to progress is to use a fairly dry sand/cement mix to bring the depth of the gap up enough so that the floor board would sit flush with the dining room floorboards and the kitchen floor tiles. I then need to fix it somehow.

Any advice about my plan and/or suggestions how to fix the floorboard?

Thanks all,

Tom

 

[r896neo]

Or just use timber packers every 300mm some off cuts of 2x2 or bigger, just make sure they are flat along the length with a string line or straight edge