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““Meet the DBI Pros" SummitMeet the DBI Pros" SummitOctober 11, 12, 2007 October 11, 12, 2007

Isam Hasenin, P.E., C.B.O, DirectorIsam Hasenin, P.E., C.B.O, Director

RESIDENTIAL EARTHQUAKE PREPAREDNESS

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Residential Earthquake Residential Earthquake PreparednessPreparedness

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

Plan Check ServicesPlan Check Services

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Earthquake PreparednessEarthquake Preparedness

Presented by Joe Duffy & Howard Zee - San Francisco Department of Building Inspection DBI Summit October 11,12, 2007

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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

contact (a distant aunt?)contact (a distant aunt?)

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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 it

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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1 Gallon per person per day 1 Gallon per person per day

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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/fireplace igniter or matchesButane barbeque/fireplace igniter or matches Large garbage bags, duct tape, utility knifeLarge garbage bags, duct tape, utility knife

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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 WaterWater ElectricityElectricity

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UtilitiesUtilitiesTrain family to turn off utilities,

but turn it off

ONLY if necessary

(or if not sure)

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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, or if you are unsureleaks, or if you are unsure

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

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Call PG&E to turn gas back onCall PG&E to turn gas back onDo not turn gas back on Do not turn gas back on

yourselfyourself

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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 it’s NOT a Improves strength, but it’s NOT a

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 seismic upgrade/retrofit per SFBC 3403.6, 1605.4 and 1605.4.33403.6, 1605.4 and 1605.4.3

Engineered design by architect or Engineered design by architect or engineerengineer

Civil engineer or structural engineerCivil engineer or structural engineer Fee: a few thousand $ up to much moreFee: a few thousand $ up to much more 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 a “it’s a “voluntary voluntary 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/garage wallsStrengthening cripple/garage 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 sill pieceMinimum of 2 bolts per sill 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 FoundationWith Square Plate WashersWith 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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Sill Bolting (Wide Mud Sill)Sill Bolting (Wide Mud Sill) Existing mud sill is wider than studsExisting mud sill is wider than studs Add new sill pieces between studs IF Add new sill pieces between studs IF

new plywood is to be addednew plywood is to be added Nail new sill to mud sill with 6-10d Nail new sill to mud sill with 6-10d

Common nails per sillCommon nails per sill Install anchor through both sillsInstall anchor through both sills

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Sill Bolting (Wide Mud Sill)Sill Bolting (Wide Mud Sill) Wide Mud SillWide Mud Sill Add New Sill PiecesAdd New Sill Pieces Nail each new sill to Nail each new sill to

mud sill w/ 6-10d mud sill w/ 6-10d Common Nails Common Nails

Anchor bolt thru Anchor bolt thru both sillsboth sills

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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 Plywood Guidelines at Cripple/Garage WallsCripple/Garage Walls

½” thick, C-DX or Structural I plywood½” thick, C-DX or Structural I plywood Minimum 4’ long wall segments, but Minimum 4’ long wall segments, but

longer segments betterlonger segments 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 Plywood Guidelines at Cripple/Garage WallsCripple/Garage Walls

Use 8d or 10d COMMON nails (3” long), Use 8d or 10d COMMON nails (3” long), not box or sinkers, and not 1 ½” shortsnot box or sinkers, and not 1 ½” shorts

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

plywood (add blocking); 4” or 6” o.c.plywood (add blocking); 4” or 6” o.c. Vent holesVent holes

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Plywood Guidelines at Plywood Guidelines at Cripple/Garage WallsCripple/Garage Walls

Install plywood sheets horizontally or Install plywood sheets horizontally or vertically, but all the same wayvertically, but all the same way

Install plywood from sill all the way up to Install plywood from sill all the way up to wall top plate; no gaps; no partial height wall top plate; no gaps; no partial height

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Plywood GuidelinesPlywood Guidelines

Nail the plywood to the sill and the studs

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Plywood GuidelinesPlywood Guidelines Nail plywood to wall Nail plywood to wall

top platestop plates No gaps in the No gaps in the

plywood sheathing plywood sheathing between sill and top between sill and top plateplate

Add horizontal Add horizontal blocking at any blocking at any horizontal plywood horizontal plywood panel edgespanel edges

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Plywood GuidelinesPlywood Guidelines Wide Mud SillWide Mud Sill Add New 2x-sill Add New 2x-sill

pieces that match pieces that match the studs so new sill the studs so new sill and studs are flushand studs are flush

Nail plywood to new Nail plywood to new sill pieces and studssill pieces and studs

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Plywood GuidelinesPlywood Guidelines Add clips between Add clips between

rim blocking and top rim blocking and top plateplate

A34 @ 12” o.c., or A34 @ 12” o.c., or minimum one A34 at minimum one A34 at each rim blockeach rim block

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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 of strapping of water water heatersheaters

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

not just drywallnot just drywall Elevate Elevate

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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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Thank you for attending!Thank you for attending! We value your opinion.We value your opinion. We’re here to help assist you.We’re here to help assist you. Our goal is to improve the value of our Our goal is to improve the value of our

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