ebb overview - microsoft
TRANSCRIPT
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EBB Overview
• Jointly managed by CEA and Cal OES
• Created to offer retrofit incentives
• EBB first to promote code-compliant retrofit
• More than 1 Million homes
+ =
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EBB Overview
• 2017 Marks Year Four
• Up to $3,000
• In Accordance with:
Appendix Chapter A3 or
Plan Set A or LA City Standard #1
• Grown Every Year to More Cities and Zips
• Funding is through CEA; however the last two years we’ve also received $3 Million from the State of California
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The Process
Timeline: 8 months
2 Months: find contractor and get permit
6 Months: complete work
Step 1: Pre-Retrofit Documentation
• Permit language reference in scope of work
“Retrofit in accordance with Chapter A3 of the CEBC”
“Retrofit in accordance with Plan Set A”
“Retrofit in accordance with LA City Standard Plan #1”
• Before photos
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Step 2: Complete Retrofit
Step 3: Post-Retrofit Documentation
• Signed building permit
• Contractor invoice broken down by materials, labor and overhead/profit
• After photos
• Payment Authorization From (provided by homeowner only)
• IRS W-9 Form (provided by homeowner only)
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The Retrofit Process
EBB was created to provide incentives to California Homeowners to seismically retrofit wood-frame residential structures.
The Program is limited to funding retrofit expenses that:
• strengthen cripple walls to enable them to function as shear members, significantly protecting the dwelling from collapsing;
• bolt foundation, enabling the dwelling to remain in place, rather than sliding off the foundation during an earthquake; and
• properly strap the water heater to reduce the likelihood of water and fire damage, and to protect the water supply.
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The seismic retrofit includes adding anchor bolts and bracing in the crawl space
around the perimeter of the foundation to improve the connection between the
wooden framing and concrete foundation. Contractors experienced in seismic
retrofitting, specifically with California Existing Building Code (CEBC) Chapter A3,
2010 Edition, are sought after for this work.
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EBB Retrofit:Sill Plate Anchorage and Cripple Wall Vulnerabilities
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Cripple Wall Failure
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Dangerous Cripple Wall Damage
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Cripple Wall Damage
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Cripple Wall Damage
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Cripple Wall Damage
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Cripple Wall Retrofits Work
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The legacy of the “Voluntary Retrofit”
• Just about anything allowed if it didn’t make the house unsafe
• Retrofits were often incomplete
• Retrofits were often not effective
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The Code: Chapter A3
The State of California has adopted, effective January 1, 2011,
California Existing Building Code (CEBC) Appendix Chapter A3:
Prescriptive Provisions for Seismic Strengthening of Cripple Walls and Sill
Plate Anchorage of Light, Wood-Frame Residential Buildings
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Code Requirements = EBB Requirements
• Code = CBC Appendix Chapter A3
• Engineered retrofit allowedby A3 for:-Cripple walls > 4’-0” tall-Walls with many/large openings
• Construction Documents =
Plan Set A, LA Standard Plan
Set or Custom Plans
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Why the 4’-0” or less Cripple Wall Requirement?
4'-0" high wall does not require a hold-down
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Can I use a Plan Set on a house with an attached garage?
If the crawlspace area to be retrofitted meets the requirements of the plan set,
AND
The building official allows it.
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Garage RetrofitOften requires engineered solution:
• > 4’-0” tall wall
• Requires prefabricated seismic resisting element
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Chapter A3 Prescriptive House
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Chapter A3 Prescriptive House
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A3 Retrofit Requirements
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A3 – Plan Set Comparison
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Retrofit Plan Required
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Retrofit Plan Required
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LABD Sample Plan
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LA Standard Plan
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Plan Set A
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Chapter A3
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Prescriptive Details
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Condition of Existing Wood
• Wood that is part of the retrofit shall be “in sound condition and free from defects” such as:
• Fungus• Insect infestation
• If damaged, replace with new materials with the same net dimension as the original
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Condition of Concrete Foundation
• Partial perimeter foundations or unreinforced masonry (brick, stone, etc.) must be evaluated by engineer or architect
• New reinforced concrete perimeter footings may be installed using the prescriptive details
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Chapter A3 allows New Footing
• New foundation may be designed per Figure A3-1 or A3-2, or be designed by an architect or engineer
• A local building official may require a soils report
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LABD Standard Plan Set allows New Footing
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Dwelling Anchorage to Foundation
Concept:
• Install anchor bolts if space permits
• If not, install proprietary or engineered anchors
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Dwelling Anchorage to Foundation
Concept:
• Is also applicable to basement and retaining walls
• Contact building department for additional retaining wall concerns
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New Anchor Bolts
Install with approved washers
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New Anchor Bolts with Proper End Distance
9 to 12 Inches from end
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Add Replacements Bolts
It is not recommended to rely on old anchor bolts
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New Foundation Plate (FP)
Chapter A3 specifies requirements for fabricated FP
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New Foundation Plates
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New Foundation Plates
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Cripple Wall Bracing
Concept:
• Install sheathing on inside face of cripple wall to resist load direction F1
• Anchor top plate to floor framing above (load in)
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New Plywood Sheathing
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New Blocking
• Mudsill is often wider than cripple wall studs
• Blocking required to create a flush face for sheathing
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Properly Placed Nails
• Size (8d common) and
spacing (4” o.c.) as
required by code/plan set
• No overdriven nails
• No shiners
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Connect Wall to Floor
Plan Set A allows a Simpson H10 in lieu of Framing Clip
Framing Clips
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Framing Clip Detail
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Vent Holes in Each Stud Bay
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Not Seismic Retrofit
Chapter A3 (Plan Set) retrofit is at perimeter bearing walls
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Not Seismic Retrofit
Angles are not approved Chapter A3/Plan Set retrofit
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Seismic Retrofit
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Seismic Retrofit
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Seismic Retrofit
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Seismic Retrofit
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