Chapter 16B — PRIVATE DRIVEWAY ACCESS BRIDGES

Section 1601B - Driveway Bridge Design and Repair.

Every driveway bridge and portion thereof for vehicular access to private garages or private parking shall be designed and constructed as a minimum in accordance with the general requirements of this Code as amended by this Section.

This Section provides design loadings for driveway bridges, driveway approach decks, garage floors, and carport floors. Secondly, this division provides for minimum prescriptive requirements for alterations or repairs of varying scope to existing driveway bridges. This Section considers the possibility of temporary heavy loads on unroofed vehicle approach decks due to construction equipment, moving vans, and heavy emergency or other vehicles using the deck. On these bases, the appropriate design loads have been determined.

In all cases lateral loads for wind or seismic shall be considered and provided for. Repairs and alterations of existing decks shall conform to the criteria pursuant to this Chapter.

Section 1602B - Design Loads.

Section 1602B.1 Case I.

Design loads for driveway bridges serving private residential parking garages/carports with restricted headroom and no repair or refueling. Design loads shall be pursuant to Chapter 16 of the California Building Code for concentrated load and uniform live load (Private or pleasure-type motor vehicle storage). Reduction of live load may be determined pursuant to Chapter 16 of the California Building Code. Design load summary as follows:

Wheel load:

Two (2) 2,000 lb. loads spaced five (5) feet apart.

Each concentrated load is to be placed upon any space a maximum of two and a half (2½) feet square pursuant to Chapter 16 of the California Building Code.

Uniform load:

One hundred (100) PSF with no allowable stress increase for duration of load. Live load reduction may be pursuant to Chapter 16 of the California Building Code.

Section 1602B.2 Case II.

Design loads for private vehicle access bridges serving a single-family dwelling on a single lot fronting unimproved streets where the length of the building access path crossing the driveway bridge is fifty (50) feet or less. The following loads apply to the portion of such vehicle access bridges in the public right-of-

way as well as the portion on private property. Pursuant to Chapter 16 of the California Building Code, this Section considers the gross weight of the maximum vehicle served to be twenty thousand (20,000) pounds for this condition (AASHTO H10 loading). The length of the access path is measured from the edge of pavement of the unimproved street to the building/garage/carport entry point. This concentrated load may be distributed in accordance with the provisions Chapter 16 of the California Building Code or, alternatively, the concentrated loads may be distributed in accordance with the Standard Specifications For Highway Bridges, 14th ed., 1989, or latest edition, as adopted by the American Association of State Highway and Transportation Officials, 444 North Capitol Street, N.W., Suite 225, Washington, D.C. 20001. Allowable stress increases for a load duration of seven (7) days may be used for this concentrated load.

A minimum uniform live load of one hundred (100) PSF, (Garages—General storage and/or repair of the California Building Code), shall be used. Reduction of live loads may be determined pursuant to Chapter 16 of the California Building Code. The condition of concentrated or uniform live load producing the greater stresses shall govern. The summary of these loads are as follows:

Wheel load:

Two (2) 8,000 lb. loads spaced five (5) feet apart.

Each concentrated load is to be placed upon any space a maximum of two and a half (2½) feet square.

May alternatively use AASHTO load distribution.

Uniform load:

One hundred (100) PSF with no allowable stress increase for duration of load. Live load reduction pursuant to Chapter 16 of the California Building Code.

Section 1602B.3 Case III.

Same As Case II, except building entry access path crossing the driveway bridge is more than fifty (50) feet. Same as for Case II, except the gross vehicle weight considered shall be thirty thousand (30,000) pounds (AASHTO Hl5).

Wheel load:

Two (2) 12,000 lb. loads spaced five (5) feet apart.

Each concentrated load is to be placed upon any space a maximum of two and a half (2½) feet square.

May alternatively use AASHTO load distribution.

Uniform load:

One hundred (100) PSF with no allowable stress increase for duration of load. Live load reduction pursuant to Chapter 16 of the California Building Code.

Section 1602B.4 Case IV.

Design Load for Private Residential Access Bridge Serving More than One Dwelling Unit or More than a Single Lot Fronting an Unimproved Street.

Design loads shall be the same as for Case III in this Chapter.

Section 1603B—Alterations or Repairs to Existing Driveway Bridges.

Section 1603B.1 Case V.

Existing driveway bridges may need repairs as their structural system or moisture barrier system is often inadequate. Plans with the permit submittal, including concrete deck removal to install new deck waterproofing, for driveway bridge repairs should show the existing structural system for the driveway bridge so its adequacy to the design criteria of this Section may be checked.

A structural evaluation by an architect or engineer of the structure based on the design load criteria of this Chapter, as appropriate, shall be provided for any driveway bridge repair for a bridge that does not have documented structural calculations.

Section 1603B.2 Case VI.

If there are practical constraints on accomplishing repair work to a bridge with a history of adequate performance, the following alternative minimum prescriptive requirements for driveway bridge repairs, when approved by the Building Official, may suffice in lieu of a structural evaluation pursuant to this Chapter:

Section 1603B.2.1 Prescriptive Requirements for Repairs Necessary Due to Faulty Waterproofing Where there is Damage to Framing and Subfloor Around the Perimeter of the Driveway Deck, but, Framing and Subfloor Within the Field of the Deck has No Damage or has Only Minor Damage.

These prescriptive requirements are as follows:

Remove concrete, replace damaged framing and subfloor as necessary. Install flexible waterproof membrane. Three-and-one-half inches (3½") to four inches (4") thick concrete replacement slab shall have No. 3 deformed steel reinforcement placed at four inches on center at center or slightly below center of slab and perpendicular to joist framing with similar reinforcement placed at six inches on center parallel to joist framing on top of perpendicular reinforcement. In lieu of reinforcing bar, steel fiber or glass fiber reinforced concrete may be used.

If the existing driveway deck joist span is greater than ten (10) feet, a supplemental support wall shall be installed at approximately the center of the existing joist span. This support wall shall include a "T" foundation as for a two-story conventional foundation and a minimum ½ inch plywood shear panel applied to the support wall on at least one side.

Surface of concrete shall receive a concrete water sealant treatment in accordance with manufacturer's instructions.

Existing structure and details for this work shall be shown on drawings and approved by the Building Official.

Section 1603B.2.2 Prescriptive Requirements for Repairs Necessary Due to Faulty Waterproofing Where there is Damage to Framing and Subfloor and the Existing Subfloor is to be Removed and Replaced.

Since this repair will expose the joists, the existing deck framing can and shall be augmented. Prescriptive requirements for repairs shall be as follows:

Remove concrete, replace damaged framing, and augment existing framing by doubling two-inch-thick framing at twelve inches or less on center or four-inch-thick framing at sixteen inches or less on center. 2x framing more than twelve inches on center and 4x framing more than sixteen inches on center shall be tripled to provide additional support.

Replace damaged subfloor as necessary. Where 50% or more of the subfloor panels of the driveway deck are damaged and replaced, replace the damaged panels with minimum 1⅛" T&G plywood or minimum two layers of ¾" plywood subfloor. Additional plywood subfloor panels shall be added on top of the undamaged subfloor for a level subfloor.

Install flexible membrane waterproofing in accordance with manufacturer's instructions. Hot mopped conventional waterproofing shall not be utilized unless specifically approved prior to installation by the Building Official.

Three-and-one-half inches (3½") to four inches (4") thick concrete replacement slab shall be reinforced with minimum No. 3 deformed steel reinforcement placed at four inches on center at center or slightly below center of slab and perpendicular to joist framing with similar reinforcement placed at six inches on center parallel to joist framing on top of perpendicular reinforcement. In lieu of reinforcing bar, steel fiber or glass fiber reinforced concrete may be used.

If the existing driveway deck joist span is greater than 10 feet, a supplemental support wall shall be installed at approximately the center of the existing joist span. This support wall shall include a "T" foundation as for a two-story conventional foundation and a minimum ½ inch plywood shear panel applied to the support wall on at least one side. Surface of concrete shall receive a concrete water sealant treatment in accordance with manufacturer's instructions.

Existing structure and details for this work shall be shown on drawings and approved by the City.

Section 1604B—Wood Driveway Deck.

Where a new wood subfloor deck is used it shall be a minimum of 2x T&G boards or 1⅛ inch minimum T&G plywood subfloor.

Section 1605B—Waterproof Membrane.

A flexible membrane waterproofing shall be installed unless a solid inflexible substrate is provided for hot- mopped built-up waterproofing. The waterproofing membrane shall be suitable for the use intended and installed in accordance with the manufacturer's instructions.

Section 1606B—Public Right-of-Way Encroachment.

The public right-of-way and any watercourse shall be clearly shown on the plans submitted for a permit. Any proposed or existing structure located within the public right-of-way and/or near a watercourse shall have an encroachment permit on file or one shall be issued, including appropriate fees, prior to building permit issuance. If the encroachment permit is denied, the proposed structure shall not be permitted.

(Ord. No. 13861, § 4, 9-15-2025)

Add at end of: "Where permitted to be installed on top of the slab, damp-proofing shall consist of mopped- on bitumen, not less than 4-mil polyethylene, or other approved methods or materials". "The use of topically applied moisture barriers to concrete slabs in conjunction with conversion of non-habitable spaces to habitable spaces provided the following are adhered to:

a)

The product's permeability is at most 0.09 perms for vapor transmission toward the habitable space, as tested according with ASTM E96, which is equivalent or better than that of 6-mil polyethylene (as tested with ASTM E1745).

b)

Technical documentation, supplied by the manufacturer, based on accredited independent laboratory testing, is provided clearly indicating the product's performance meet these criteria.

c)

The product is installed per its listing by qualified individuals and per the manufacturer's instructions and special inspection is conducted by a person knowledgeable and with demonstrated history of performing such inspections on the applications of such product.

d)

The owner agrees to hold the City of Oakland Harmless by completing and submitting a Hold armless Agreement to be filed with the County Recorder against the parcel for a fee in accordance with the Oakland Master Fee Schedule."

(Ord. No. 13861, § 4, 9-15-2025)

Delete Sections 1807.1.3 and 1807.1.4 of the California Building Code in their entirety.

(Ord. No. 13861, § 4, 9-15-2025)

In Section 1807.1.6.1 of the California Building Code, after "…shall not be less than the thickness of the wall supported," insert "or 6 inches, whichever is greater."

(Ord. No. 13861, § 4, 9-15-2025)

In Section 1807.1.6.3 of the California Building Code, under Item #1, delete the phrase "Table 1807.1.6.3(1) for plain masonry walls or."

(Ord. No. 13861, § 4, 9-15-2025)

Delete Table 1807.1.6.3(1) of the California Building Code in its entirety.

(Ord. No. 13861, § 4, 9-15-2025)

In Section 1809.3 of the California Building Code, replace the first sentence with "The top surface of footings, foundations, and grade beams shall be level."

(Ord. No. 13861, § 4, 9-15-2025)

Delete Sections 1809.8, 1809.9.2, 1809.11, and 1809.12 of the California Building Code in their entirety.

(Ord. No. 13861, § 4, 9-15-2025)

Add the following new Chapter 18B for requirements for Grading, Excavations, and Fills: