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Fix worn door threshold: remove, measure, seal, replace

We'll remove the worn saddle, inspect for rot, cut and bed a replacement threshold, and seal it—calling a carpenter if the sill structure is bad.

Troubleshooting · Home maintenance
45–90 min
What you'll need
  • Replacement threshold to match opening
  • Pry bar, screwdriver, utility knife
  • Exterior caulk and caulk gun
  • Hacksaw or miter saw for cuts
Step 1 of 4

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Steps

Goal: Replace a worn door threshold so the door seals against drafts and water without binding.

  • Confirm the bottom of the door—not the sides—is the main leak path.
  • Good: Solid sill and a standard saddle replacement—continue.
  • Bad: Soft or rotten sill—see When to get help.

Assess the damage

Goal: Know whether you are swapping a part or rebuilding the sill.

  • Pry a small section and probe the wood. Soft fiber means moisture damage.
  • Good: Clean, firm sill after old threshold removal.
  • Bad: Rot deeper than 1/2 inch—professional repair.

When to get help

Call a carpenter if:

  • The sill or rim joist is rotted or not level across the opening.
  • Masonry or stoop work is needed outside the door.
  • The door must be removed to correct swing height.

For related fixes, see Fix a door that sticks or Fix a door that will not latch.

Verification

  • No visible daylight under the closed door except designed weep gaps.
  • Door opens and closes without scraping the new threshold.
  • Interior floor covering transitions are trip-safe.

Escalation ladder

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

  1. Confirm sill leak Feel drafts and inspect cracks.
  2. Remove old Pry and clean sub-sill.
  3. Fit new Cut, dry-fit, bed in caulk.
  4. Seal and test Caulk edges; check door sweep.
  5. Call a carpenter Rot or structural sill work.

What to capture if you need help

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

  • Width across jambs at floor
  • Photos of old threshold profile
  • Any soft wood on sill

Is draft or water coming through the bottom sill?

Compare to side and top leaks.

Yes: Remove and replace threshold. No: Check door sweep and jamb seals instead.

Yes No

You can change your answer later.

Is wood under the threshold solid?

Probe for rot.

Yes: Install new saddle. No: Carpenter for sill repair.

Yes No

You can change your answer later.

Does new threshold seal when door closes?

Adjust height or sweep.

Yes: Caulk and finish. No: Tune sweep or call pro for level issues.
Question

Draft stopped?

Continue

You can change your answer later.

Done or escalate

Threshold replaced and sealed, or pro scheduled for rot.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why replace instead of paint a worn threshold?
Paint hides splinters but not cracks that leak air and water. A cracked wood or bent aluminum saddle should be replaced once it no longer seals against the door bottom.
Can I install a taller threshold to fix a big gap?
You can within limits—too tall blocks the door sweep. Match door clearance and add a door shoe or adjust the sweep if the gap is uneven.
When should I call a carpenter?
Call a pro if the subfloor or rim joist is soft, the sill is not square, or exterior door alignment needs jamb work.

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