• In this video, This Old House general contractor Tom Silva explains how to replace a threshold.


    1 Remove old threshold from doorway using hammer and reciprocating saw.
    2 Use reciprocating saw to cut the nails securing toekick; remove toekick.
    3 Test-fit new threshold in doorway.
    4 Build up toekick and subfloor with pressure-treated lumber; re-install toekick.
    5 Apply bead of tri-polymer caulk to joint between finished floor and new threshold.
    6 Install new threshold, then tap shims underneath.
    7 Close door and check for even gap along threshold.
    8 Open door, and apply expanding polyurethane sealant under the threshold.
    9 Close the door, then tap shims between door bottom and top of threshold; leave shims in place until the sealant cures.
    10 Sand threshold, then finish with an exterior paint or stain and topcoat that contains a ultra-violet protector.
    See products and services from this episode
    • Difficulty: Moderate
      Basic carpentry skills required
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      Video Directory

      Selected Topic/Section

      Tools List

      • chisel
      • reciprocating saw
        Reciprocating saw
      • caulk gun
        Caulking gun
      • drill

      Shopping List

      1. New oak threshold

      2. Wood shims

      3. Tri-polymer caulk,

      for sealing joint between floor and threshold

      4. Expanding polyurethane sealant,

      used to adhere threshold

      5. Pressure-treated lumber,

      used to fill in subfloor and bolster toekick

      6. 100-grit sandpaper

      7. Exterior paint or stain and topcoat varnish

      8. 2-inch decking screws,

      used to fasten subfloor