“Meet the DBI Pros" Summit October 11, 12, 2007 Isam Hasenin, P.E., C.B.O, Director

1. “Meet the DBI Pros" SummitOctober 11, 12, 2007 Isam Hasenin, P.E., C.B.O, Director RESIDENTIAL EARTHQUAKE PREPAREDNESS

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

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

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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 (a distant aunt?)

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 it • Store in cool, dark place secure from animals and easy to get to

13. 1 Gallon per person per day

14. 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/fireplace igniter or matches • Large garbage bags, duct tape, utility knife

15. 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

16. Utilities • Natural Gas • Water • Electricity

17. Utilities Train family to turn off utilities, but turn it off ONLY if necessary (or if not sure)

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

19. Call PG&E to turn gas back on • Do not turn gas back on yourself

20. Natural Gas

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

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

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

24. Seismic Upgrade or Seismic Retrofit • Building permit required for voluntary seismic upgrade/retrofit per SFBC 3403.6, 1605.4 and 1605.4.3 • Engineered design by architect or engineer • Civil engineer or structural engineer • Fee: a few thousand $ up to much more • It’s a seismic upgrade / seismic retrofit

25. 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

26. 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 a “voluntary strengthening”.

27. General Guidelines and Tips for “Voluntary Strengthening” • Adding anchor bolts • Strengthening cripple/garage walls • One size does NOT fit all

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

29. 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 sill piece • One bolt located not more than 12”, and not less than 5 ½”, from each end of the sill piece

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

31. Bolt Sill to FoundationWith 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

32. Sill Bolting (Wide Mud Sill) • Existing mud sill is wider than studs • Add new sill pieces between studs IF new plywood is to be added • Nail new sill to mud sill with 6-10d Common nails per sill • Install anchor through both sills

33. Sill Bolting (Wide Mud Sill) • Wide Mud Sill • Add New Sill Pieces • Nail each new sill to mud sill w/ 6-10d Common Nails • Anchor bolt thru both sills

34. 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.

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

36. Plywood Guidelines at Cripple/Garage Walls • Use 8d or 10d COMMON nails (3” long), 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

37. Plywood Guidelines at Cripple/Garage Walls • Install plywood sheets horizontally or vertically, but all the same way • Install plywood from sill all the way up to wall top plate; no gaps; no partial height

38. Plywood Guidelines Nail the plywood to the sill and the studs

39. Plywood Guidelines • Nail plywood to wall top plates • No gaps in the plywood sheathing between sill and top plate • Add horizontal blocking at any horizontal plywood panel edges

40. Plywood Guidelines • Wide Mud Sill • Add New 2x-sill pieces that match the studs so new sill and studs are flush • Nail plywood to new sill pieces and studs

41. Plywood Guidelines • Add clips between rim blocking and top plate • A34 @ 12” o.c., or minimum one A34 at each rim block

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

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

44. 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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46. QUESTIONS ? • Use the microphone • Please limit each question to a couple minutes maximum • Please fill out evaluation form