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Meet the DBI Pros SummitMeet the DBI Pros SummitOctober 25, 2006 October 25, 2006

Amy Lee, Acting DirectorAmy Lee, Acting Director

RESIDENTIAL EARTHQUAKE PREPARATION

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Residential Earthquake Residential Earthquake PreparationPreparation

Joe Duffy, Senior Building Inspector/DBIJoe Duffy, Senior Building Inspector/DBI Howard Zee, Structural Engineer/DBI Howard Zee, Structural Engineer/DBI

Major Plan CheckMajor Plan Check

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Earthquake PreparednessEarthquake Preparedness

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

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Marina photo1 Marina photo1

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Marina photo2Marina photo2

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Marina photo3Marina photo3

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PERSONAL PERSONAL PREPAREDNESSPREPAREDNESS

Make your family and home as safe as possible.

www.72hours.org

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Develop a Family Emergency PlanDevelop a Family Emergency Plan Locate safe shelter Locate safe shelter

areas in your home areas in your home Identify places to store Identify places to store

emergency supplies emergency supplies Arrange where to meet after a Arrange where to meet after a

disaster disaster Establish a distant phone Establish a distant phone

contactcontact

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Home Work Vehicles Transportable

Assemble and Maintain Assemble and Maintain Emergency SuppliesEmergency Supplies

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Shoes – sturdy, with socks

Crowbar

Leather work gloves

Flashlight w/batteries

Cash, ID, cell phone

Your “Grab & Go” Bedroom KitYour “Grab & Go” Bedroom Kit

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ATM, credit cards

Essential medication and eye glasses

Whistle Scissors Watch or clock

““Grab & Go” ItemsGrab & Go” Items

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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

Water – MinimumWater – Minimum1 gallon/person/dayx51 gallon/person/dayx5

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Home/transportable suppliesHome/transportable supplies Water purification kitWater purification kit First aid kit and instruction bookFirst aid kit and instruction book Antiseptic wipes or baby wipesAntiseptic wipes or baby wipes Foods requiring little heat or waterFoods requiring little heat or water Can opener, eating utensilsCan opener, eating utensils Toilet paper and personal hygiene itemsToilet paper and personal hygiene items Butane barbeque igniter or matchesButane barbeque igniter or matches Large garbage bags, duct tapeLarge garbage bags, duct tape

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more home/transportable supplies…more home/transportable supplies… Battery-operated radio, spare batteriesBattery-operated radio, spare batteries Flashlights, spare batteries, and bulbsFlashlights, spare batteries, and bulbs Blankets for all family membersBlankets for all family members Warm clothesWarm clothes Diapers, if neededDiapers, if needed Pet food, leash, and carrier, if neededPet food, leash, and carrier, if needed Tent, sleeping bagsTent, sleeping bags Backpacks to carry emergency suppliesBackpacks to carry emergency supplies

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UtilitiesUtilities

Natural gasNatural gas ElectricityElectricity WaterWater

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

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Natural GasNatural Gas Teach children to identify Teach children to identify

the smell of gas (rotten the smell of gas (rotten eggs)eggs)

Turn off gas if you smell Turn off gas if you smell leaks & are unsureleaks & are unsure

Turn off gas if your meter Turn off gas if your meter wheels are spinningwheels are spinning

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Turn off gas if necessary (suspect Turn off gas if necessary (suspect

leaking gas, broken pipes)leaking gas, broken pipes) Call PG&E to turn gas back onCall PG&E to turn gas back on Do not turn gas back on yourselfDo not turn gas back on yourself

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Natural GasNatural Gas

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WaterWaterTurn off water if house is flooding or if water is contaminated

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Shut off Water, IF necessaryShut off Water, IF necessary Locate water Locate water

shutoffshutoff Insert tool in hole Insert tool in hole

& remove cover& remove cover Turn water OFFTurn water OFF

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Home Preparedness StructuralHome Preparedness Structural Structural evaluation by architect Structural evaluation by architect

or engineer or engineer Seismic upgrade/retrofitSeismic upgrade/retrofit Meets Code requirementsMeets Code requirements

Do-it-yourself strengtheningDo-it-yourself strengthening Improves strength, but not a true Improves strength, but not a true

seismic upgrade/retrofitseismic upgrade/retrofit Not as good, but better than nothingNot as good, but better than nothing

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Seismic Upgrade or Seismic RetrofitSeismic Upgrade or Seismic Retrofit Building permit required for voluntary Building permit required for voluntary

seismic upgrade/retrofit per SFBC 3403.6 seismic upgrade/retrofit per SFBC 3403.6 and 3403.2.2.2and 3403.2.2.2

Engineered design by architect or Engineered design by architect or engineerengineer

Civil engineer or structural engineerCivil engineer or structural engineer Fee: a few thousand $Fee: a few thousand $ It’s a It’s a seismic upgrade / seismic retrofitseismic upgrade / seismic retrofit

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Do-it-yourself Voluntary Do-it-yourself Voluntary Strengthening Strengthening

No drawings required, but must get a No drawings required, but must get a building permitbuilding permit

Engineer’s stamp not requiredEngineer’s stamp not required Architect’s stamp not requiredArchitect’s stamp not required It’s NOT a seismic upgrade or retrofit It’s NOT a seismic upgrade or retrofit

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Description of work: Description of work: ““voluntary strengthening work voluntary strengthening work to add anchor bolts and to add anchor bolts and plywood at lowest story, etcplywood at lowest story, etc””

Residential Permit Counter Residential Permit Counter (1(1stst floor) floor)

No drawings, architect, or No drawings, architect, or engineer requiredengineer required

Over-the-counter permit Over-the-counter permit approvalapproval

It’s NOT a “It’s NOT a “seismic upgrade seismic upgrade or retrofit”, or retrofit”, it’s simply a it’s simply a seismic “seismic “strengtheningstrengthening”.”.

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General Guidelines and Tips for General Guidelines and Tips for Voluntary StrengtheningVoluntary Strengthening

Adding anchor boltsAdding anchor bolts Strengthening cripple wallsStrengthening cripple walls One size does NOT fit allOne size does NOT fit all

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Anchor BoltsAnchor Bolts Access and Access and

space to workspace to work Mud sillMud sill

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Anchor Bolt Guidelines Anchor Bolt Guidelines

5/8” or ¾” diameter (A307 or A36)5/8” or ¾” diameter (A307 or A36) At least 7” embedment into foundationAt least 7” embedment into foundation Spaced not more than 4’ apartSpaced not more than 4’ apart Minimum of 2 bolts per pieceMinimum of 2 bolts per piece

One bolt located not more than 12”, and One bolt located not more than 12”, and not less than 5 ½”, from each end of the sill not less than 5 ½”, from each end of the sill piecepiece

California Building Code Requirements

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Anchor boltAnchor bolt Epoxy type adhesives best for older Epoxy type adhesives best for older

concrete foundations (Simpson, CIA, concrete foundations (Simpson, CIA, Hilti, etc)Hilti, etc)

Expansion anchors Expansion anchors Approximate cost per anchorApproximate cost per anchor

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Bolt Sill to FoundationBolt Sill to FoundationUsing Square Plate WashersUsing Square Plate Washers

Plate washers must be a minimum of 2” x 2” x 3/16”

thick

Square plate washers perform better in quakes than round washers

Galvanized steel plates best

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StrengthenStrengthenCripple WallsCripple Walls

Crawl SpaceCrawl Space Cripple WallCripple Wall

First FloorFirst Floor

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 Plywood Guidelines at Cripple WallsWalls

½” thick, C-DX or Structural I½” thick, C-DX or Structural I Minimum 4’ long segments, but longer Minimum 4’ long segments, but longer

segments bettersegments better Well distributed among all cripple walls, Well distributed among all cripple walls,

all sides of house. Cover the corners.all sides of house. Cover the corners.

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Plywood Guidelines at Cripple Plywood Guidelines at Cripple WallsWalls

Use 8d or 10d COMMON nails, not box or Use 8d or 10d COMMON nails, not box or sinkers, and not 1 ½” shortssinkers, and not 1 ½” shorts

Galvanized nails best, but not essentialGalvanized nails best, but not essential Nail along all edges of each sheet of plywood Nail along all edges of each sheet of plywood

(add blocking); 4” or 6” o.c.(add blocking); 4” or 6” o.c. Vent holesVent holes A34 metal connectorsA34 metal connectors

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Home/Building Preparedness Home/Building Preparedness Nonstructural ItemsNonstructural Items

ChimneysChimneys Lighting fixturesLighting fixtures Water heatersWater heaters Wall hangingsWall hangings FurnitureFurniture AppliancesAppliances

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Water Heaters Water Heaters Earthquake Earthquake

strapping strapping of of water heaterswater heaters

2 metal straps2 metal straps 1/3 points 1/3 points Anchor to studs, Anchor to studs,

not just drywallnot just drywall

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Additional InformationAdditional Information 72hours.org website72hours.org website USGS.org - personal and home USGS.org - personal and home FEMA 526 – personal preparednessFEMA 526 – personal preparedness Call 800 480 2520 to order free FEMA Call 800 480 2520 to order free FEMA

documentsdocuments NERT– www. sfgov.org/sffdnertNERT– www. sfgov.org/sffdnert ABAG – www. quake.abag.ca.govABAG – www. quake.abag.ca.gov

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Display boardsDisplay boards Hilti and Simpson reps in lobbyHilti and Simpson reps in lobby DBI Information booth in lobbyDBI Information booth in lobby Again, www.72hours.org websiteAgain, www.72hours.org website

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QUESTIONS ?QUESTIONS ?

Use the microphoneUse the microphone Please limit each question to a couple minutes Please limit each question to a couple minutes

maximum maximum

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

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