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This foundation was built 1938, and seems unusually tippy even for the time. This is in an earthquake zone, the garage has a second floor above, and the given wall is shearwalled and bolted, with plywood on the inside. Your thoughts?

1938 Foundation

  • Width at base is 9.5 inches? – Daniel Griscom Nov 11 '15 at 10:55
  • Due to taper it's wider. Amending diagram. – Bryce Nov 12 '15 at 0:13
  • The width is 15 inches at the slab level. It's strongly tapered on the inside, vertical on the outside. – Bryce Nov 12 '15 at 15:52
  • That's a significant width, especially since the inside edge is anchored by that garage slab. Would it be safe in an earthquake? I have no idea. – Daniel Griscom Nov 12 '15 at 15:55
  • The inside edge is a cold joint (separate pour). – Bryce Nov 13 '15 at 6:06

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