• In this video, This Old House general contractor Tom Silva shows how to prevent water from leaking in behind vinyl siding.

    Steps:
    1. Inspect the area above the leak, including both indoors and out.
    2. Check to be sure weep holes are open along bottom of window openings.
    3. Use a caulking gun to apply a continuous bead of silicone sealant along the vertical seams between the vinyl J-channels and the exterior window casings.
    • Difficulty: Easy
      setting up the extension ladder is the hardest part
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    Video Directory

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      Tools List

      • extension ladder
        Extension ladder, used to reach the work area on the side of the house
      • caulk gun
        Caulking gun, for applying silicone sealant

      Shopping List

      1. Silicone sealant, used to form a watertight seal