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

+ =

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

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

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)

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.

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.

EBB Retrofit:Sill Plate Anchorage and Cripple Wall Vulnerabilities

Cripple Wall Failure

Dangerous Cripple Wall Damage

Cripple Wall Damage

Cripple Wall Damage

Cripple Wall Damage

Cripple Wall Retrofits Work

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

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

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

Why the 4’-0” or less Cripple Wall Requirement?

4'-0" high wall does not require a hold-down

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.

Garage RetrofitOften requires engineered solution:

• > 4’-0” tall wall

• Requires prefabricated seismic resisting element

Chapter A3 Prescriptive House

Chapter A3 Prescriptive House

A3 Retrofit Requirements

A3 – Plan Set Comparison

Retrofit Plan Required

Retrofit Plan Required

LABD Sample Plan

LA Standard Plan

Plan Set A

Chapter A3

Prescriptive Details

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

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

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

LABD Standard Plan Set allows New Footing

Dwelling Anchorage to Foundation

Concept:

• Install anchor bolts if space permits

• If not, install proprietary or engineered anchors

Dwelling Anchorage to Foundation

Concept:

• Is also applicable to basement and retaining walls

• Contact building department for additional retaining wall concerns

New Anchor Bolts

Install with approved washers

New Anchor Bolts with Proper End Distance

9 to 12 Inches from end

Add Replacements Bolts

It is not recommended to rely on old anchor bolts

New Foundation Plate (FP)

Chapter A3 specifies requirements for fabricated FP

New Foundation Plates

New Foundation Plates

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)

New Plywood Sheathing

New Blocking

• Mudsill is often wider than cripple wall studs

• Blocking required to create a flush face for sheathing

Properly Placed Nails

• Size (8d common) and

spacing (4” o.c.) as

required by code/plan set

• No overdriven nails

• No shiners

Connect Wall to Floor

Plan Set A allows a Simpson H10 in lieu of Framing Clip

Framing Clips

Framing Clip Detail

Vent Holes in Each Stud Bay

Not Seismic Retrofit

Chapter A3 (Plan Set) retrofit is at perimeter bearing walls

Not Seismic Retrofit

Angles are not approved Chapter A3/Plan Set retrofit

Seismic Retrofit

Seismic Retrofit

Seismic Retrofit

Seismic Retrofit

• Mark Grissom

–Customer Service Manager

–mgrissom@calquake.com

–916.661.5520

Contacts