• In this video, This Old House general contractor Tom Silva explains how to patch stucco.


    Steps:

    1 Scrape loose, blistered stucco from the wall with a 4-inch drywall knife.
    2 Clean away loose grit and dust from the wall with a wire brush.
    3 Create stucco by mixing three parts sand, one part Portland cement and ¼ part lime in trough or wheelbarrow.
    4 Add water and mix with shovel until stucco is the consistency of peanut butter.
    5 Mix in some mortar dye to tint the stucco to the desired color.
    6 Lightly mist the wall with a garden hose; keep wall damp while applying the stucco.
    7 Place some stucco on the hawk, then spread it onto the wall with a trowel.
    8 Patch in all exposed wall areas with stucco.
    9 Use a wet rubber float to smooth and blend the new stucco with the surrounding surfaces.
    10 Press the rubber float into the stucco, then pull straight out to create a stippled texture.
    11 Allow the stucco to thoroughly dry, then apply a coat of masonry primer and paint.
    • Difficulty: Moderate to hard
      The repair itself isn’t all that difficult, but it takes a lot of practice to apply stucco like a pro.
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      Tools List

      • drywall knife
        4-inch drywall knife,
        used to scrape off loose stucco
      • wire brush
        Wire brush,
        for cleaning scraped wall surfaces
      • flat blade shovel
        Shovel,
        used to mix stucco
      • wheelbarrow
        Mortar trough or wheelbarrow,
        for mixing stucco
      • plaster hawk
        Hawk,
        used to hold stucco while working
      • mason's trowel
        Trowel,
        for applying stucco to wall
      • rubber float
        Rubber float,
        used to smooth stucco patch

      Shopping List

      1. Portland cement, sand and lime,

      mixed with water to form stucco



      2. Mortar dye,

      used to tint stucco to match wall



      3. Garden hose

      4. Masonry primer and paint,

      used to blend patch with wall, if necessary