Special Retrofit Anchors May Be Needed

• Drilled-in anchors

  • Mechanical
  • Adhesive

• Side plates

  • Connect sill plate to foundation

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• Special retrofit anchors may be required
  • Existing anchor bolts in the sill plate may be too few in numbers, too small, or may be rusted through under the sill plate.
  • Some older buildings did not bolt their sill plates to the concrete stem wall.
  • In these cases, special retrofit anchors must be used to strengthen the sill plate connection.
  • New sill plate anchors are installed in two ways:
    • Drilled-in anchors through the sill plate or
    • Side plates that connect the sill plate to the foundation concrete or masonry. Side plates are used when there is not enough room to stand a drill motor on top of the sill plate.