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Fix a wallpaper seam that shows

We'll confirm the seam type—gap, overlap, or loose edge—then fix it by sliding and rolling, double-cutting, re-pasting, or using seam sealer.

Troubleshooting · Home maintenance
15–45 min
What you'll need
  • Wallpaper adhesive (for gaps and loose edges)
  • Seam roller
  • Seam sealer (for gaps when strips cannot move)
  • Utility knife and straightedge (for overlaps)
  • Small brush or roller
  • Damp sponge
Step 1 of 7

Quick triage — pick your path

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Choose the option that matches what you see. You can jump straight to that section.

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Steps

Goal: Confirm the seam type, then fix it with the right method.

  • Inspect the seam. Note whether it is a gap (space between strips), an overlap (one strip on top of another), or a loose edge (paper lifting away from the wall).
  • Good: You know the type—proceed to Gap path, Overlap path, or Loose edge path.
  • Bad: Unsure—look closely. A gap has space between strips; an overlap has one strip on top of another; a loose edge lifts away from the wall.

Gap path

Goal: Close the gap by sliding strips or fill it with seam sealer.

  • Check if the strips are still workable. Gently press near the seam. If the strip shifts or you can slide it slightly, the adhesive may still be wet enough.
  • If workable: Lift the edge. Apply wallpaper adhesive behind it with a small brush. Gently slide the strip toward the other strip until the gap closes. Roll with a seam roller. Wipe away excess adhesive with a damp sponge.
  • If dry and rigid: Use a seam sealer—clear or tinted to match—to fill the gap. Apply a thin bead along the seam. Smooth with a damp cloth or fingertip. Let dry per the product label.
  • Good: The gap is closed or filled—done.
  • Bad: The seam still shows—try a second application of seam sealer or call a pro if the paper is fragile.

Overlap path

Goal: Remove the overlap with a double-cut and create a clean butt seam.

  • Place a straightedge along the overlap. Use a sharp utility knife to cut through both layers in one pass. Remove the top strip and the cut piece from the bottom strip.
  • Lift the remaining edge of the top strip. Apply adhesive behind it. Press the edge back to the wall. Roll with a seam roller from the center outward. Wipe away excess adhesive.
  • Good: The overlap is gone and the seam is flat—done.
  • Bad: The seam is still raised—apply adhesive behind it and roll again.

Loose edge path

Goal: Re-adhere the loose edge so it lies flat.

  • Lift the edge gently with a putty knife. Apply adhesive behind the edge with a small brush. Press the edge back to the wall.
  • Roll with a seam roller from the center toward the edges—do not roll along the seam or you can stretch the paper. Wipe away excess adhesive.
  • Good: The edge is flat and adhered—done.
  • Bad: The edge is still loose—apply more adhesive and roll again. If it keeps lifting, the wall may have moisture—call a pro.

When to get help

Call a wallpaper installer if:

  • The paper is fragile, vintage, or valuable.
  • The wall has moisture damage.
  • You have tried the steps and the seam still shows or the paper tears.

Do not force fragile paper—it can rip. Confirm you have tried the steps above before calling. For related fixes, see Fix a wall that has a crack or Fix peeling paint.

Verification

  • The seam is flat and the gap is closed or filled.
  • No overlap visible; strips meet at a clean butt seam.
  • The edge is adhered and does not lift away.
  • The repair blends with the surrounding wall.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Confirm seam type Note whether it is a gap, overlap, or loose edge.
  2. Check if strips are workable For a gap, see if you can slide the strip—if yes, adhesive is still workable.
  3. Gap — slide or seam sealer Slide strips together and roll, or use seam sealer if strips are dry.
  4. Overlap — double-cut Cut through both layers, remove excess, re-paste and roll.
  5. Loose edge — re-paste Lift edge, apply adhesive, press back, roll.
  6. Call a pro Fragile or vintage paper; moisture damage; steps tried and seam still shows.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Seam type (gap, overlap, or loose edge)
  • Whether strips are still workable
  • Wallpaper type (vinyl, paper, grasscloth)
  • Steps already tried

What type of seam do you have?

Inspect the seam. Note whether it is a gap (space between strips), an overlap (one strip on top of another), or a loose edge (paper lifting away from the wall).

Inspect the seam. Gap: Space between strips—proceed to check if strips are workable. Overlap: One strip on top of another—proceed to double-cut. Loose edge: Paper lifting away—proceed to re-paste. Good: You know the type. Bad: Unsure—look closely at the seam.

Gap Overlap or loose edge

You can change your answer later.

Can you slide the strip to close the gap?

If the adhesive is still wet, you may be able to slide the strip. If the paper is dry and rigid, use seam sealer.

Gently press near the seam. Try to slide the strip toward the other strip. Yes: Apply adhesive behind the edge, slide strips together, roll with a seam roller. No: Use seam sealer to fill the gap. Verify you should see the gap closed or filled.

Yes No

You can change your answer later.

Apply adhesive, slide, and roll

Lift the edge. Apply wallpaper adhesive behind it. Slide the strip toward the other strip until the gap closes. Roll with a seam roller. Wipe away excess adhesive. If the seam still shows after drying, use seam sealer.

Done

Apply seam sealer

Apply seam sealer along the gap with the applicator tip. Smooth with a damp cloth or fingertip. Let dry per the product label. Verify you should see the gap filled and the seam less visible.

Done

Is it an overlap or a loose edge?

Overlap: one strip on top of another. Loose edge: paper lifting away from the wall.

Check the seam. Overlap: One strip overlaps the other—double-cut. Loose edge: Paper lifting away—re-paste. Good: You know which. Bad: If both, fix the overlap first, then re-paste if needed.

Overlap Loose edge

You can change your answer later.

Double-cut and remove excess

Place a straightedge along the overlap. Cut through both layers with a sharp utility knife. Remove the top strip and the cut piece from the bottom. Lift the remaining edge of the top strip, apply adhesive behind it, press back, and roll with a seam roller. Verify you should see a butt seam with no overlap.

Done

Re-paste and roll

Lift the edge gently. Apply adhesive behind it. Press the edge back to the wall. Roll with a seam roller from the center outward. Wipe away excess adhesive. Verify you should see the edge flat and adhered.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why does a wallpaper seam show?
Common causes: strips hung with a gap or overlap, shrinkage after drying, adhesive not applied to the seam edge, or strips not properly "booked" before hanging. The fix depends on whether you have a gap, overlap, or loose edge.
Can I fix a wallpaper seam myself?
Yes. Gaps can often be closed by sliding strips and rolling, or filled with seam sealer. Overlaps need double-cutting. Loose edges need re-pasting. If the wallpaper is fragile, vintage, or the wall has moisture, call a pro.
When should I call a pro for a wallpaper seam?
Call a wallpaper installer if the paper is fragile, vintage, or valuable; the wall has moisture damage; or you have tried the steps and the seam still shows or the paper tears. Do not force fragile paper—it can rip.

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