Gaps in wooden floor

[RK_London]

I'm trying to fill in gaps of my bedroom floor so I can sand and re-varnish - floor is birch and hasn't been touched in 25yrs.

Problem is some of the gaps are about 8mm and wood looks like it has warped abit. Not sure if I should use filler or glue in some pieces of wood. See attached picture.

Any help/ advice appreciated.

Thanks

 

[blup]

You can mix sawdust from a spare or similar species board and mix with glue for filler, its a bit messy though. Can you leave as is to allow for the movement that has already occurred?

 

[RK_London]

Used sawdust and glue for the smaller gaps. But wasn't sure about using if for bigger gaps or if there was a better way. But you are right, leaving boards with gaps is one option.

 

[blup]

Slivers of wood for the larger gaps, or use filler and sand floor after

 

[RK_London]

Found some pine slivers - was going to use these even though floor is a birchwood floor. Should I really get Birchwood slivers?