Instructables

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

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Step 10:

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Securing upper floors

Some building codes may require that upper floor membranes (plywood sheet floor) be secured to the foundations, particularly in multi-storey wood structures. This may be done with a threaded steel rod passed through the ceiling to secure the membrane, connected to anchor bolts in the foundation.

If this is not explicitly required, e.g. in 2-storey construction, it may nevertheless be desirable to secure the membrane by means of the wooden studs. Where an anchor bolt and bracket is fastened to the lower end of a stud, another bracket may be fastened to the upper end and a threaded rod passed through the ceiling joist to secure the membrane with a nut and washer, or metal plate.
Drill a clearance hole using an auger bit to pass the threaded rod.
 
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