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Residential Earthquake Preparation - DBI Summit

Learn how to prepare your home and family for an earthquake with tips from the San Francisco Department of Building Inspection. Topics covered include personal preparedness, assembling emergency supplies, and strengthening your home's structure.

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Residential Earthquake Preparation - DBI Summit

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  1. Meet the DBI Pros SummitOctober 25, 2006 Amy Lee, Acting Director RESIDENTIAL EARTHQUAKE PREPARATION

  2. Residential Earthquake Preparation • Joe Duffy, Senior Building Inspector/DBI • Howard Zee, Structural Engineer/DBI Major Plan Check

  3. Earthquake Preparedness Presented by Joe Duffy & Howard Zee - San Francisco Department of Building Inspection DBI Summit October 25, 2006

  4. Marina photo1

  5. Marina photo2

  6. Marina photo3

  7. PERSONAL PREPAREDNESS Make your family and home as safe as possible. www.72hours.org

  8. Develop a Family Emergency Plan • Locate safe shelter areas in your home • Identify places to store emergency supplies • Arrange where to meet after a disaster • Establish a distant phone contact

  9. Assemble and Maintain Emergency Supplies • Home • Work • Vehicles • Transportable

  10. Your “Grab & Go” Bedroom Kit • Shoes – sturdy, with socks • Crowbar • Leather work gloves • Flashlight w/batteries • Cash, ID, cell phone

  11. “Grab & Go” Items • ATM, credit cards • Essential medication and eye glasses • Whistle • Scissors • Watch or clock

  12. Water – Minimum1 gallon/person/dayx5 • Unopened store-bought drinking water – check expiration date • Stored tap water should be purified before using • Store in cool, dark place secure from animals and easy to get to

  13. Home/transportable supplies • Water purification kit • First aid kit and instruction book • Antiseptic wipes or baby wipes • Foods requiring little heat or water • Can opener, eating utensils • Toilet paper and personal hygiene items • Butane barbeque igniter or matches • Large garbage bags, duct tape

  14. more home/transportable supplies… • Battery-operated radio, spare batteries • Flashlights, spare batteries, and bulbs • Blankets for all family members • Warm clothes • Diapers, if needed • Pet food, leash, and carrier, if needed • Tent, sleeping bags • Backpacks to carry emergency supplies

  15. Utilities Train family to turn off utilities, if necessary (not automatically) • Natural gas • Electricity • Water

  16. Natural Gas • Teach children to identify the smell of gas (rotten eggs) • Turn off gas if you smell leaks & are unsure • Turn off gas if your meter wheels are spinning

  17. Turn off gas if necessary (suspect leaking gas, broken pipes) • Call PG&E to turn gas back on • Do not turn gas back on yourself

  18. Natural Gas

  19. Water Turn off water if house is flooding or if water is contaminated

  20. Shut off Water, IF necessary • Locate water shutoff • Insert tool in hole & remove cover • Turn water OFF

  21. Home Preparedness Structural • Structural evaluation by architect or engineer • Seismic upgrade/retrofit • Meets Code requirements • Do-it-yourself strengthening • Improves strength, but not a true seismic upgrade/retrofit • Not as good, but better than nothing

  22. Seismic Upgrade or Seismic Retrofit • Building permit required for voluntary seismic upgrade/retrofit per SFBC 3403.6 and 3403.2.2.2 • Engineered design by architect or engineer • Civil engineer or structural engineer • Fee: a few thousand $ • It’s a seismic upgrade / seismic retrofit

  23. Do-it-yourself Voluntary Strengthening • No drawings required, but must get a building permit • Engineer’s stamp not required • Architect’s stamp not required • It’s NOT a seismic upgrade or retrofit

  24. Description of work: “voluntary strengthening work to add anchor bolts and plywood at lowest story, etc” • Residential Permit Counter (1st floor) • No drawings, architect, or engineer required • Over-the-counter permit approval • It’s NOT a “seismic upgrade or retrofit”, it’s simply a seismic “strengthening”.

  25. General Guidelines and Tips for Voluntary Strengthening • Adding anchor bolts • Strengthening cripple walls • One size does NOT fit all

  26. Anchor Bolts • Access and space to work • Mud sill

  27. Anchor Bolt Guidelines California Building Code Requirements • 5/8” or ¾” diameter (A307 or A36) • At least 7” embedment into foundation • Spaced not more than 4’ apart • Minimum of 2 bolts per piece • One bolt located not more than 12”, and not less than 5 ½”, from each end of the sill piece

  28. Anchor bolt • Epoxy type adhesives best for older concrete foundations (Simpson, CIA, Hilti, etc) • Expansion anchors • Approximate cost per anchor

  29. Bolt Sill to FoundationUsing Square Plate Washers Square plate washers perform better in quakes than round washers Galvanized steel plates best Plate washers must be a minimum of 2” x 2” x 3/16” thick

  30. First Floor Crawl Space Cripple Wall StrengthenCripple Walls A cripple wall is generally the weakest part of older building because it has insufficiently strong sheathing materials. This can cause full or partial collapse in an earthquake. These areas can be strengthened for relatively low cost by correctly applying plywood sheathing to the cripple walls.

  31. Plywood Guidelines at Cripple Walls • ½” thick, C-DX or Structural I • Minimum 4’ long segments, but longer segments better • Well distributed among all cripple walls, all sides of house. Cover the corners.

  32. Plywood Guidelines at Cripple Walls • Use 8d or 10d COMMON nails, not box or sinkers, and not 1 ½” shorts • Galvanized nails best, but not essential • Nail along all edges of each sheet of plywood (add blocking); 4” or 6” o.c. • Vent holes • A34 metal connectors

  33. Home/Building Preparedness Nonstructural Items • Chimneys • Lighting fixtures • Water heaters • Wall hangings • Furniture • Appliances

  34. Water Heaters • Earthquake strapping of water heaters • 2 metal straps • 1/3 points • Anchor to studs, not just drywall

  35. Additional Information • 72hours.org website • USGS.org - personal and home • FEMA 526 – personal preparedness • Call 800 480 2520 to order free FEMA documents • NERT– www. sfgov.org/sffdnert • ABAG – www. quake.abag.ca.gov

  36. Display boards • Hilti and Simpson reps in lobby • DBI Information booth in lobby • Again, www.72hours.org website

  37. QUESTIONS ? • Use the microphone • Please limit each question to a couple minutes maximum

  38. Thank you for attending! • We value you and your opinion • We want you to feel that we’re here to help assist you • Our goal is to improve the value of our services to better serve you • We’ve been listening to you telling us what’s important • New improvements are on the horizon • Please fill out evaluation forms. Thank you!

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