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

    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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      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