Symptoms
- Visible gaps between plank edges
- Gaps more noticeable in certain rooms or seasons
- Dirt collecting in the gaps
- Planks that click-lock but don't sit fully snug
Likely causes
- CommonPlanks not fully engaged during installationIf the click-lock mechanism wasn't tapped fully together, small gaps remain from day one.
- CommonFloor shifting slightly after installationFoot traffic and temperature changes can work planks apart slightly over time, especially without enough expansion gap at the walls.
- PossibleInsufficient expansion gap at the room's perimeterWithout room to expand, planks can push against each other unevenly and separate elsewhere.
- PossibleSubfloor unevenness causing inconsistent contactA dip in the subfloor can keep certain planks from locking fully tight.
What to do
- Identify whether gaps are isolated to a few planks or widespread across the room.
- For a few gapped planks, use a tapping block and rubber mallet to gently tap the plank back into full engagement with its neighbor.
- Work from the nearest wall or fixed point toward the gap so you're pushing the plank into place rather than away from it.
- Check the expansion gap around the room's perimeter (usually under baseboards or quarter round) and ensure it's not overly tight, which can cause planks to buckle and separate elsewhere.
- For gaps that won't close by tapping, the row may need to be disassembled back to that point and reinstalled with more attention to full engagement.
- For a widespread, persistent gapping issue, a flooring installer can assess whether the subfloor or original installation is the root cause.
- Once closed, monitor the same area over the following weeks and seasons to see if the gap reopens.
Tools and parts
- Tapping block
- Rubber mallet
- Pull bar
When to call a pro
Call a flooring installer if gaps are widespread or keep reopening after tapping planks back together.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.