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San Ramon LogoRoofing Requirements

 

GENERAL

A permit is required when more than twenty-five percent (25%) of the roof covering, in any plane of any building or structure is replaced in any twelve (12) month period. The new roof covering shall be made to conform to the requirements of the California Building Code for new construction and City of San Ramon requirements.

New Construction. Fire-retardant roof covering as indicated in Section 1505.1.1 or 1505.1.2 or 1505.1.3, including pressure treated wood shake or shingle roof assemblies when approved by the Building Official, shall be required for all new construction. Roofing with less than one-fourth inch (1/4") slope per foot shall have deputy inspection during application of all roofing materials.

Roofing in the Hillside Brush Area (the area on the east side of Alcosta Boulevard and east of Alcosta Boulevard to Stagecoach Road and on the west side of San Ramon Valley Boulevard and west of San Ramon Valley Boulevard), as defined by the Building Official and San Ramon Valley Fire Protection Districts shall be constructed as required in UBC Section 1503.1 and/or 1503.2.

1505.1.1 Roof Coverings within Very High Fire Hazard Severity Zones. All new structures, and every existing structure when 50 percent or more of the total roof area is reroofed within a one-year period, the entire roof covering of every new structue, and any roof covering applied in the alteration, repair or replacement of the roof of any exisitng structure, shall be a fire-retardant roof covering that is at least Class A.

1505.1.2 Roof Coverings within State Responsibility Areas. Every new structure, and every existing structure when 50 percent or more of the total roof area is reroofed within a one-year period, the entire roof covering of every new structue, and any roof covering applied in the alteration, repair or replacement of the roof of any exisitng structure, shall be a fire-retardant roof covering that is at least Class B.

1505.1.3 Roof Coverings in All Other Areas. Every new structure, and every existing structure when 50 percent or more of the total roof area is reroofed within a one-year period, the entire roof covering of every new structue, and any roof covering applied in the alteration, repair or replacement of the roof of any exisitng structure, shall be a fire-retardant roof covering that is at least Class C.


ROOFING REQUIREMENT DETAILS

ATTIC VENTILATION

Enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof framing members shall have cross ventilation for each separate space by ventilating openings protected against the entrance of rain and snow. Blocking and bridging shall be arranged so as not to interfere with the movement of air. An airspace of not less then 1 inch (25mm) shall be provided between the insulation and the roof sheathing. The net free ventilating area shall not be less than 1/150th of the area of the space ventilated. (2013 CBC 1203.2)

ROOF DRAINAGE

The 2013 California Building Code is scheduled for enforcement beginning January 1, 2014.  It uses the 2012 International Residential Code as its base document.   Section 801.3 of the International Residential Code regulates drainage for “one and two family” residential buildings and is a much more comprehensive section than the City of San Ramon’s two separate ordinances adopted in the past. 

San Ramon will allow the use of the 2013 California Code provisions.  Though not yet effective, it has been adopted by the State of California Building Standards Commission.   The 2013 State Codes become effective on January 1, 2014.  The drainage section provision, will be allowed as an “Alternate Method of Construction” in accordance with section 104.11 of the administrative provisions of the 2013 California Building Code and the City of San Ramon Administrative provisions.

Previous ordinances have mandated installation of roof gutters and drains to the street for all residential properties and another ordinance requires that all roof drainage be deposited on the property whenever possible, essentially to whatever extent  the yard could  absorb the rain runoff.   The intent of the provisions it to reduce the runoff water to the storm and bay but whenever water must be removed from the property it must be channeled to the street in an approved manner. 

The primary reason for having roof gutters and drainage from a Building Code standpoint is to collect the water, move it away from the building thereby preventing damage to the structure by keeping the water away from the foundation.   The 2013 Code will resolve that issue and remove the conflict between the two City ordinances.    For those properties where the yard is inadequate to absorb the rain water the new provisions would require runoff to drain through an approved drainage system.   The location of the water deposit must be an “approved” location.  

  • Runoff is not allowed to drain across a sidewalk or walking surface.
  • In the absence of a soils report the soil will be considered “Expansive”
  • All system must terminate through the curb and under the sidewalk unless it can be shown the area and soil conditions will allow drainage to be absorbed into the ground on the property (5 feet or more away from the structure).

References: 2012 IRCR801.3 Roof Drainage

“In areas where expansive or collapsible soils are known to exist, all dwellings shall have a controlled method of water disposal from roofs that will collect and discharge roof drainage to the ground surface at least 5 feet (1524 mm) from foundation walls or to an approved drainage system.”

City of San Ramon Municipal Code:

  • Storm Water Management and Discharge Control B6-360
  • Roof Drainage C1-52

INSPECTION REQUIRED AFTER TEAR-OFF COMPLETED

Inclement Weather Conditions policy is in place for the time period of October 15 to April 15. Please refer to section below.
  • Once old roofing materials have been removed an inspection to verify the condition of the original roof sheathing is required. This inspection shall be prior to nailing in place any new sheathing over eves and overhangs.
  • Installing plywood over space sheathing, stagger joints.
  • Plywood joints to fall on the framing members (rafters or trusses).
  • Spacing of 1/8" shall be maintained between plywood sheets.
  • Solid fill needed at horizontal joints.
  • Nailing of plywood sheathing shall be accomplished by using min. 8d (2.5") nails with spacing not to exceed 6 inches o.c. on the edges, and 12 inches o.c. in the field. 

INSPECTION REQUIRED AFTER COMPLETELY NAILING OFF PLYWOOD

  • Cover entire roof with 15# felt paper or 30# felt paper as required.
  • Install 1/2 square of roofing material and call for inspection.

INSPECTION REQUIRED AS INSTALLATION OF RE-ROOFING COMMENCES

  • All vents shall be flashed with an approved flashing.
  • Galvanized flashing will not be permitted on a plastic system unless rubber grommet is used.
  • All vents must be protected with a storm collar, rubber grommet, or "O" ring flashing system.
  • Tape or mastic will not be acceptable as waterproofing.
  • Ridge vents shall have a rating equivalent to the rating of the roofing materials.

FINAL INSPECTION OF RE-ROOFING PROCEDURE IS REQUIRED

  • A ladder is required to be provided at the site, either by the contractor or the homeowner, for the use of the inspector.
  • Inspection card is required to be posted on site in an obvious location.
  • A spark arrester is required to be installed on existing chimney prior to final.
  • No nails or fasteners shall be exposed at the completion of the job.
  • Exposed nails or fasteners shall be sealed with silicone caulking or other material approved by the Building Official.

Re-Roofing in Inclement Weather Conditions - click to view instructions

To assist and assure that the roofing contractor is able to maintain integrity of a re-roof project preformed between the time period of October 15 through April 15 of each calendar year, the procedure for inspection of the nailing of the roof sheathing will be as follows:

  • No tear-off inspection will be required during the above referenced time frame.

  • During the above listed time frame, the Roofing Contractor shall submit on company letterhead a statement that either the roof had no dryrot or water damage to be removed, or dryrot or water damage was observed and removed. The contractor shall also provide a hand drawn sketch of the roof of that particular house and identify the location where the dryrot or water damage was removed and replaced. The letter shall be signed and the name of the signer printed on the letter.

  • The contractor may proceed with installing the roof sheathing as per City of San Ramon requirements.

  • Felt paper may then be installed over roof sheathing to insure watertight integrity of the dwelling.

  • Additionally, ½ square of roofing material shall be installed. Upon completion, call for tearoff, nailing and in progress inspections.

  • At time of inspection request, the contractor letter verifying the condition of the existing framing and sheathing is required to be on site or delivered to the inspector. The roofing personnel shall pullback the felt paper in random areas as identified by the inspector. Should the roofing personnel not be on the site at the time of inspection, the inspector shall pull back the felt in enough areas (3 or 4) to be able to inspect for proper nailing of the roof sheathing materials.

 

 

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