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Earthquake mitigation for a slab-on-grade wood frame house

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Step 4:

Picture of
Inside Access
Where the sill plate is accessible on the inside, such as in an unfinished room or garage, the anchor bolts may simply be fitted from the inside of the house.
  • Using the bracket as a template, drill through the sill plate with a wood bit of appropriate size
  • Drill into the concrete below with a concrete bit using a hammer drill. It may be easier to drill a smaller pilot hole first
  • Remove any cement dust from the hole with a vacuum cleaner. Using a "blow" attachment or a compressed air wand is more effective at removing dust at the bottom of the hole.
  • Measure the depth of the hole with a probe to determine the bolt insertion depth.
  • If using epoxy, pour epoxy into the hole and coat the rod with more resin
  • Hammer the bolt into the hole until it is fully inserted. Fit a nut over the end of the bolt first to minimize burring of the bolt head, or to allow any burring to be removed by unthreading the nut.
  • Remove the nut, fit the bracket over the bolt, replace the nut and tighten with a wrench.
  • Bolt or nail the bracket to the stud. Drill pilot holes somewhat smaller than the nail or lag bolt diameter to minimize splitting of the wood.
The photo shows a commercial anchor bolt bracket designed for nailing
 
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