Should You Fill Gaps Between Floorboards?

For normal gaps, no repairs are needed. Adding filler is not a good idea; it will get pushed out as the wood expands with moisture. For larger gaps that don't close up, call in a professional contractor who can repair floors properly. The best times to repair hardwood floors are April and October.

Do you need to fill gaps between floorboards?

If you're bothered by gaps in the dry winter months but don't seem to notice them much during the relatively humid seasons, it's probably best to leave the gaps alone, as filling them when they're at their widest will create problems when the wood expands again and the gaps naturally close up.

Do you fill gaps in floorboards before sanding?

The most common technique for filling gaps is to mix wood dust from the sanded floor with resin to form a paste that is pressed into the gaps and then sanded when dry.