Step 2: Mask expansions

repairing concrete «»
Large concrete slabs are typically divided into sections by expansion joints, which help control cracking. The ½- to ½-inch-wide joints are usually filled with asphalt-saturated felt, a wood 1x4 or plastic channel. These joints must remain exposed to allow the slab to expand and contract; don't cover them with the cement top dressing. Mask each expansion joint with a strip of duct tape.
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    Tools List

    • drill
      Electric drill with mixing paddle
    • caulk gun
      Caulking gun
    • putty knife
      Putty knife
    • flat finishing trowel
      Trowel
    • push broom
      Push broom
    • garden sprayer
      Pump sprayer

    Shopping List

    1. CONCRETE RESURFACER
    one 20-pound bag will cover about 50 to 60 square feet

    2. 5-GALLON BUCKET
    for mixing concrete resurfacer

    3. TSP (trisodium phosphate)
    used to clean concrete prior to resurfacing

    4. DUCT TAPE
    used to cover expansion joints prior to resurfacing

    5. CONCRETE-REPAIR CAULK
    used to fill cracks up to ½-inch wide

    6. MASONRY MORTAR MIX
    for patching cracks wider than ½-inch

    7. MASONRY SEALER
    for treating the concrete after resurfacing