Step 2: Saw Off the Old Sill

Make a plumb cut flush with the sheathing along the length of the rotten sill. A circular saw with a beveled blade can handle most of the cutting, but for the sill ends where a circ saw can't reach, switch to a multitool, like this Fein Multimaster equipped with an oscillating saw blade. Smooth the cut with a few strokes of a hand plane.
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    Tools List

    • circular saw
      Circular saw
    • detail sander
    • drill
    • hammer
    • flat prybar
      Pry bar

    Shopping List

    1. 8d stainless-steel ring-shank nails
    for casing

    2. 3½-inch deck screws for sill

    3. Two-part acrylic adhesive (The brand used here is Bond&Fill.)4. Cellular-PVC windowsill (The brand used here is Kleer Lumber, which has the most sill options. AZEK also makes a PVC sill.)