Clean the gaps thoroughly
Remove dust, dirt, and loose debris
Check for movement or loose floorboards
Secure loose boards with screws or nails
Choose a suitable filler for the gap size
Use flexible wood filler for small gaps
Use timber slivers or strips for larger gaps
Cut filler strips to fit the gap tightly
Apply wood glue to the strip or gap
Tap the strip into place
Trim off any excess material
Sand the filled area smooth
Match the filler to the floor color
Stain or finish the repaired area if needed
Seal the floor to help reduce future gaps
Maintain stable indoor humidity
Avoid overfilling gaps with rigid filler
Test the repair on a small area first