Symptoms
- Visible line or gap where two carpet pieces meet
- Fibers fraying along the seam edge
- Seam more noticeable after vacuuming against the grain
- Seam location often near a doorway or hallway
Likely causes
- CommonOriginal seam adhesive failing over timeHeat-activated seam tape can weaken with age, heavy traffic, or moisture.
- CommonPoor original seaming techniqueA seam cut or taped incorrectly during installation is more likely to fail early.
- PossibleRepeated foot traffic stressing the seamHigh-traffic seams see more stress and can separate sooner.
- PossibleMoisture or spills weakening the seam adhesiveLiquid getting into a seam can degrade the bond underneath.
What to do
- Lift the carpet gently at the separated seam to expose the old seam tape underneath.
- Vacuum out any debris from the gap.
- Cut a new strip of heat-activated seam tape sized to the length of the separated section, sliding it under both carpet edges.
- Use a seaming iron to heat the tape evenly, working in small sections and pressing the carpet edges together as you go.
- Work quickly but carefully, aligning the carpet pile direction and pattern (if any) across the seam as you press it down.
- Weight the seam down with books or a roller while the adhesive cools and sets.
- For a wide or badly frayed seam gap, or a seam that keeps failing, a professional carpet repair may give a longer-lasting result.
Tools and parts
- Seaming iron
- Seam tape
- Carpet knife
Carpet seam tapeSearch: “heat activated carpet seam tape”
When to call a pro
Call a carpet installer if the seam is long, in a very visible area, or has failed multiple times already.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.