ignition resistant eave constructiondestruction of structures by fire in all cases. for more...
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County of San Diego, Planning & Development Services
IGNITION RESISTANT EAVE CONSTRUCTION
BUILDING DIVISION
5510 OVERLAND AVE., SUITE 110, SAN DIEGO, CA 92123 ● (858) 565-5920 ● (888) 336-7553
HTTP://WWW.SDCPDS.ORG PDS 198 REV.: 01/01/2020 PAGE 1 of 6
GUIDANCE DOCUMENT
Since the 1980s, the County’s fire and building codes have been strengthened in successive code adoption cycles with the primary goal of protecting the safety of our citizens and enhancing a home’s ability to survive a wildfire. Although such measures protected many homes located within the areas impacted by the 2003 and 2007 wildfires, analysis of the burned homes identified areas where we could improve our codes; one of these areas is eave construction. Winds in wildfires carry huge amounts of burning embers, swirling into cracks and crevices, igniting anything that is combustible. Eaves, because they are perpendicular to the wall, tend to capture blowing embers. Eave vents, which are designed to move air in and out of the attic, give opportunity for embers to ignite soffit material or enter attic areas. Once a fire starts in an attic, it goes undetected for some time and is very difficult to stop even under ideal conditions. As a result, improvements were made to the County’s codes to establish a series of permissible ignition resistant eave construction details, see attached. Each detail can be downloaded individually in AutoCAD DWG file format at: http://www.co.san-diego.ca.us/pds/bldgforms/eaveindex.html. Eave construction on an addition may match the existing structure provided that the square footage of the addition does not exceed 50% of the existing structure or 2,500 square feet, whichever is less. The vents in these eaves must still comply with current County codes requiring resistance to intrusion of flames and embers.
Vents for enclosed attics, eave soffit spaces, enclosed rafter spaces formed where ceilings are applied directly to the underside of roof rafters, underfloor vents, and vent openings in exterior walls and exterior doors shall be listed to ASTM E 2886 and comply with all of the following: (County Building code 92.1.706A.2, 92.1.707A5)
a. There shall be no flaming ignition of the cotton material during the Ember Intrusion Test. b. There shall be no flaming ignition during the Integrity Test portion of the Flame Intrusion
Test. c. The maximum temperature of the unexposed side of the vent shall not exceed 662
degrees Fahrenheit (350 degrees Celsius). While these standards will provide a high level of protection to structures built in the wildland-urban interface area, there is no guarantee that compliance with these standards will prevent damage or destruction of structures by fire in all cases. For more information on eave construction or other fire code requirements, please refer to the Wildland-Urban Interface – County Fire and Building Code Requirements (PDS #664) or contact the San Diego County Fire Authority at 858-974-5999.
http://www.co.san-diego.ca.us/pds/bldgforms/eaveindex.html
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DETAIL 1
FASCIA PROTECTED
DATE: 01-01-2020
SCALE: NONE
FORM: PDS 198
County of San Diego, Planning & Development Services
GUIDANCE DOCUMENT - IGNITION RESISTANT EAVES
BUILDING DIVISION
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AutoCAD SHX TextMETAL DRIP EDGE
AutoCAD SHX TextNON-COMBUSTIBLE OR
AutoCAD SHX TextIGNITION RESISTANT MATERIAL
AutoCAD SHX Text FASCIA
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DETAIL 2
FOAM TRIM
DATE: 01-01-2020
SCALE: NONE
FORM: PDS 198
County of San Diego, Planning & Development Services
GUIDANCE DOCUMENT - IGNITION RESISTANT EAVES
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AutoCAD SHX TextMETAL DRIP EDGE
AutoCAD SHX Text FASCIA
AutoCAD SHX TextWITH COLOR COAT
AutoCAD SHX TextFOAM TRIM ENCLOSED
AutoCAD SHX TextNON-COMBUSTIBLE OR
AutoCAD SHX TextIGNITION RESISTANT MATERIAL
AutoCAD SHX TextSCRATCH & BROWN COAT
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DETAIL 3
MODIFIED HEAVY TIMBER
DATE: 01-01-2020
SCALE: NONE
FORM: PDS 198
County of San Diego, Planning & Development Services
GUIDANCE DOCUMENT - IGNITION RESISTANT EAVES
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AutoCAD SHX TextMETAL DRIP EDGE
AutoCAD SHX Text3x6 MINIMUM
AutoCAD SHX TextFASCIA OPTION USE
AutoCAD SHX Text4x6 MINIMUM
AutoCAD SHX TextEXPOSED RAFTER TAILS
AutoCAD SHX Text2x EXTERIOR GRADE
AutoCAD SHX TextT&G STARTER BOARDS
AutoCAD SHX TextNON-COMBUSTIBLE OR
AutoCAD SHX TextIGNITION RESISTANT MATERIAL
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DETAIL 4
EXPOSED FASCIA
DATE: 01-01-2020
SCALE: NONE
FORM: PDS 198
County of San Diego, Planning & Development Services
GUIDANCE DOCUMENT - IGNITION RESISTANT EAVES
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AutoCAD SHX TextMETAL DRIP EDGE
AutoCAD SHX Text2x FASCIA
AutoCAD SHX TextNON-COMBUSTIBLE OR
AutoCAD SHX TextIGNITION RESISTANT MATERIAL
AutoCAD SHX TextOR
AutoCAD SHX Text1 LAYER OF 5/8" TYPE X GYP BOARD
AutoCAD SHX TextOR
AutoCAD SHX TextNON-COMBUSTIBLE OR IGNITION
AutoCAD SHX Text2x BLOCK
AutoCAD SHX Text1 ADDITIONAL 2x BLOCK (2 TOTAL)
AutoCAD SHX TextRESISTANT MATERIAL
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DETAIL 5
EXPOSED FIRE RETARDANT
TREATED WOOD FASCIA
DATE: 01-01-2020
SCALE: NONE
FORM: PDS 198
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AutoCAD SHX Text2x BACKING BLOCK
AutoCAD SHX Text2x FIRE RETARDANT PRESSURE
AutoCAD SHX TextTREATED LUMBER FASCIA
AutoCAD SHX TextMETAL DRIP EDGE
AutoCAD SHX Text%%uFIRE RETARDANT LUMBER%%u:
AutoCAD SHX TextUSE EITHER EXTERIOR FIRE-X RETARDANT TREATED LUMBER,
AutoCAD SHX TextCA SFM LISTING 2520-1701:100, %%uOR%%u FRX FIRE RETARDANT
AutoCAD SHX TextALL FIRE RETARDANT TREATED LUMBER SHALL NOT TO BE LEFT
AutoCAD SHX TextUNFINISHED.
AutoCAD SHX TextTREATED WOOD, ESR-1159.
AutoCAD SHX TextNON-COMBUSTIBLE OR
AutoCAD SHX TextIGNITION RESISTANT MATERIAL
pds198_partial_contentGUIDANCE DOCUMENT
pds198_partial_eave detailsDetail_01E - 2019-8.5x11.pdfSheets and Views8.5x11
Detail_03B_E - 2019-8.5x11.pdfSheets and Views8.5x11
Detail_04B_E - 2019-8.5x11.pdfSheets and Views8.5x11
Detail_07E - 2019-8.5x11.pdfSheets and Views8.5x11
Detail_11E - 2019-8.5x11.pdfSheets and Views8.5x11