Retrofitting Homes Slides

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  • See APA Report 154, 138, Technical Note N370C
  • Retrofitting Homes Slides

    1. 1. Seismic` Retrofitting
    2. 2. 1. Bolt cripple walls to foundation2. Secure cripple walls to the floor joists3. Install plywood shear panels
    3. 3. • Bolting is only of value where walls have been braced with plywood• The number of bolts is calculated to have the same resistance capacity as the plywood
    4. 4. Bearing plates increasestrength of bolt-to-wood SEAOSC Research connection
    5. 5. • Oversized bolt holes are found in most existing bolt installations.• More than 1/16 of an inch larger than diameter of bolt is considered oversized.
    6. 6. • Caused by over-sized holes• Over-sized holes are common because they allow builders to adjust the position of the mudsill
    7. 7. Foundation plates replace bolts where drill-space is unavailable
    8. 8. Movement prevented by shear transfer ties
    9. 9. There are three ways to attacha plywood panel to themudsill:• Directly to Flush Framing• The Nailed Blocking Method• The Flush Cut Method
    10. 10. 2x4 blocks installed between 2x4 studs on 2x6 mudsill
    11. 11. • Improper nailing often causes wood splitting• Pneumatically driven staples can be driven closer and reduce splitting at time of driving and when loaded in shear
    12. 12. Updated plumbing, wiring and structural modifications
    13. 13. Old-fashioned, inconsistent and odd framing
    14. 14. Replacing rotted or pest-damaged wood
    15. 15. Shear walls with finished-to-match panels between
    16. 16. Anchor plates and shear transfer ties house to foundation
    17. 17. Eddie Sandoval Tel:415-680-2112esandoval@cal-insure.com

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