Who this guide is for
- Homeowners with vinyl plank that gaps, separates or lifts
- People preparing to brief a flooring installer
- Anyone whose LVP gaps in sunny or temperature-variable rooms
- Owners wanting a clear record before an assessment
How the planks separate
Note whether gaps open along the long edges, ends pull apart, planks lift at the joint, or the floor peaks. Note whether it is one or two joints or widespread.
Describe what you see rather than deciding whether it is heat, the subfloor, or the perimeter gap.
- Gaps along the long plank edges
- Ends pulling apart
- A joint lifting or peaking
- A whole area shifting together
Sunlight and temperature
Record whether the gapping is worst in rooms with strong direct sun, by patio doors, or near heat sources, and whether it opens and closes with the time of day or season. Vinyl can move with temperature.
Note whether the gaps appear in the heat and close when cooler.
Perimeter and subfloor clues
Look at where the floor meets the wall and note any expansion gap, since locked vinyl needs room to move. Note whether the subfloor feels uneven or there has been any moisture beneath.
Record whether furniture sits on the floor in a way that pins it down.
Photographing the gapping
Photograph the gaps with a card for scale, the perimeter where the floor meets the wall, and any sun exposure. Keep dated images, ideally at different times of day, to show movement.
Avoid forcing planks back together or gluing joints before assessment.
- Card for scale at the gaps
- Capture the perimeter and sun exposure
- Date images at different times of day
Briefing a flooring installer
Bring your photos, the sun and temperature notes, and the perimeter observations before contacting a flooring installer.
Let them assess whether it is movement, the subfloor, or the perimeter gap; your record helps them judge the cause.
Documentation checklist
- 1Record how the planks separate — edges, ends, lifting, or peaking
- 2Note whether it is a few joints or widespread
- 3Record whether it is worst in sunny or hot rooms
- 4Note whether gaps open and close with time of day or season
- 5Look at the perimeter for an expansion gap
- 6Note any uneven subfloor or moisture beneath
- 7Photograph gaps with scale and the perimeter, dated at different times
- 8Avoid forcing planks together or gluing joints
Common mistakes to avoid
- Forcing planks back together or gluing joints before an installer assesses it
- Ignoring strong sunlight or heat that drives vinyl movement
- Overlooking whether an expansion gap exists at the perimeter
- Pinning the floor with heavy furniture and masking the cause
- Assuming a product fault when the subfloor or perimeter may be involved
When to involve a professional
- A flooring installer can assess whether gapping is from movement, the subfloor, or the perimeter gap
- If moisture beneath is suspected, mention it, as the subfloor may need checking
- Avoid gluing or forcing planks before assessment, as it can hide the cause
- What is involved varies by product and installation, and a professional should confirm the cause
Frequently asked questions
Questions readers ask about this topic
Why is my vinyl plank floor gapping?
Locked vinyl can move with temperature and sunlight, and needs room at the perimeter to do so; gaps can also relate to the subfloor. Recording where and when the gaps appear helps an installer judge which is involved.
Why does it gap more in sunny rooms?
Vinyl expands and contracts with temperature, so strong direct sun or heat sources can drive gapping. Noting that it is worst in sunny rooms, and whether gaps open and close through the day, is a useful clue.
Can I just push the planks back together?
Pushing or gluing planks rarely lasts if the underlying movement or perimeter issue remains, and it can hide the cause. It is more useful to document the pattern and let an installer assess it.
Does the expansion gap matter for vinyl too?
Yes — locked vinyl needs room to move around the room's edges, and without it the floor can gap or peak. Noting whether the floor runs tight to the wall is exactly what an installer wants to know.
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