Meet the DBI Pros Summit October 25, 2006 Amy Lee, Acting Director

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Meet the DBI Pros SummitOctober 25, 2006 Amy
Lee, Acting Director
RESIDENTIAL EARTHQUAKE PREPARATION
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Residential Earthquake Preparation

• Joe Duffy, Senior Building Inspector/DBI
• Howard Zee, Structural Engineer/DBI Major Plan
  Check

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Earthquake Preparedness
Presented by Joe Duffy Howard Zee - San
Francisco Department of Building Inspection DBI
Summit October 25, 2006
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Marina photo1
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Marina photo2
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Marina photo3
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PERSONAL PREPAREDNESS
Make your family and home as safe as
possible. www.72hours.org
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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

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Assemble and Maintain Emergency Supplies

• Home
• Work
• Vehicles
• Transportable

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Your Grab Go Bedroom Kit

• Shoes sturdy, with socks
• Crowbar
• Leather work gloves
• Flashlight w/batteries
• Cash, ID, cell phone

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Grab Go Items

• ATM, credit cards
• Essential medication
  and eye glasses
• Whistle
• Scissors
• Watch or clock

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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

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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

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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

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Utilities
Train family to turn off utilities, if necessary
(not automatically)

• Natural gas
• Electricity
• Water

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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

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• Turn off gas if necessary (suspect leaking gas,
  broken pipes)
• Call PGE to turn gas back on
• Do not turn gas back on yourself

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Natural Gas
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Water
Turn off water if house is
flooding or if water is
contaminated
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Shut off Water, IF necessary

• Locate water shutoff
• Insert tool in hole remove cover
• Turn water OFF

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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

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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
• Its a seismic upgrade / seismic retrofit

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Do-it-yourself Voluntary Strengthening

• No drawings required, but must get a building
  permit
• Engineers stamp not required
• Architects stamp not required
• Its NOT a seismic upgrade or retrofit

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• 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
• Its NOT a seismic upgrade or retrofit, its
  simply a seismic strengthening.

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General Guidelines and Tips for Voluntary
Strengthening

• Adding anchor bolts
• Strengthening cripple walls
• One size does NOT fit all

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Anchor Bolts

• Access and space to work
• Mud sill

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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

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Anchor bolt

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

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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
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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.
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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.

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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

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Home/Building Preparedness Nonstructural Items

• Chimneys
• Lighting fixtures
• Water heaters
• Wall hangings
• Furniture
• Appliances

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Water Heaters

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

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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

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

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QUESTIONS ?

• Use the microphone
• Please limit each question to a couple minutes
  maximum

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Thank you for attending!

• We value you and your opinion
• We want you to feel that were here to
• help assist you
• Our goal is to improve the value of our
• services to better serve you
• Weve been listening to you telling us
• whats important
• New improvements are on the horizon
• Please fill out evaluation forms. Thank you!

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