Step 4: Install the Flashing

Installing sill flashing
Photo: Reena Bammi
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• A layer of flashing on the subsill prevents water from reaching the framing below. Tom uses Vycor Plus, a rubbery, self-adhering membrane that he cuts to fit between the jambs and a few inches wider than the subsill. The flashing goes over the subsill, adhesive side down, with just enough overhang in front to cover the top edge of the toekick.

• After smoothing out the membrane, Tom grabs the edge closest to the inside of the house and rolls it over onto itself, forming a small dam against water infiltration.
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    Tools List

    • 16-foot tape measure
      Measuring tape
    • reciprocating saw
      Reciprocating saw (with wood-cutting blade)
    • bar flat
      Flatbar
    • hammer
      Hammer
    • chisel
      Chisel
    • speed square
      Square
    • circular saw
      Circular saw
    • hand saw
      Handsaw

    Shopping List

    1. BORATE SOLUTION
    (if needed, for rotting wood)

    2. SELF-ADHERING FLASHING MEMBRANE

    3. 120-GRIT SANDPAPER

    4. SHIMS

    5. EXPANDING FOARM SEALANT

    6. SPAR VARNISH