firewise construction what is firewise construction promotes fire resistiveness required for new...
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FireWise Construction
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What Is FireWise Construction
• Promotes fire resistiveness
• Required for new construction (in Flagstaff)
• Found predominately in the Wildland-Urban Interface
• Compliments vegetation management
• Behavior modification (landscaping & storage)
• Site location
• Roof material
• Roof venting
• Soffits & eaves
• Siding material
• Deck material & construction
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What is the Wildland – Urban Interface?
Traditional Definition
Where structural improvements are built in close proximity to or among forested areas.
New Definition
Where community values may be threatened by a catastrophic wildfires.
Values such as: watersheds, wildlife habitat, recreation, economic development, public health, emotional connectedness to the land.
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Traditional Wildland – Urban Interface
The Flagstaff “Interface”
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FireWise Roofs
Burning Brand Test – brands applied to roof covering (to see if they ignite)
Flying Brand Test – flame applied to roof covering (to see if they create flying embers)
Class A – effective against severe fire exposure.
Class B – effective against moderate fire exposure.
Class C – effective against light fire exposure.
Flame Spread also tested.
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FireWise Roofs
• Metal: sheet & shingles• Slate Shingles• Clay Tile• Asphalt Shingles• Fiber-cement Shingles• Membrane Roofs: covered with concrete
NO WOOD SHAKES OR SHINGLES!!
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Metal Roof
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Slate Shingles
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Clay Tile
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FireWise Soffits & Roof Venting
SoffitsThe extension of the roof beyond the exterior wall is the eave. Enclosing the eave creates a soffit.
Flat soffits best – FireWise Construction page 18 & 19
Roof Venting• Gable vents• Turbine vents• Metal vents• Eave fascia vents• Dormer vents
Vents subject to embers need wire mesh ¼ inch or smaller
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Gable Vents
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Metal Vents
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Dormer Vents
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Soffit Enclosures
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Siding Material
• Fiber Cement Products– HardiBoard– HardiPlank
• Masonry Products– Concrete block– Rock (veneer or solid)– Stucco
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Fiber Cement Siding
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Stucco
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FireWise Decks
• Deck assemblies are not lab tested for performance in wildfires.
• Deck assemblies are not tested like roofs are tested.
• Decks are second most vulnerable component of a home to ignite during wildfires.
• Accumulation of debris (pine needles) on surface and vegetation under decks are primary problems.
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Flagstaff Fire Dept Deck Tests
• Ad Hoc tests conducted in March 2002.
• Decks subjected to burning embers.
• Decks subjected to a surface fire.
• Multiple materials tested:– Wood– Trex– Timbertech– Choicedek– Boardwalk (2003)– Geodeck (2003)
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Deck Test – Burning Embers
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Deck Test – Burning Embers
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Deck Test – Burning Embers
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Deck Test – Surface Fire
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Deck Test – Surface Fire (Redwood)
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Deck Test – Surface Fire (Redwood)
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Deck Test – Surface Fire (Redwood)
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Deck Test – Surface Fire (Trex)
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Deck Test – Surface Fire (Trex)
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Deck Stairs
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Deck Stairs
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Deck Storage – Nothing Under the Deck
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Vegetation Management• Ponderosa Pine forests are a “fire dependant”
ecosystem. (low intensity & frequent fire)
• Catastrophic wildfire is NOT NORMAL.
• Scientific research puts historical tree density between 20 to 60 trees per acre.
• Existing tree density is between 200 – 1,000 trees per acre.
• Thin first, then broadcast burn.
• Remove fuel ladders & horizontal continuity.
• Landscape with fire resistant plants.
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Current Vegetative Condition
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Thinned Area After Treatment
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FireWise Landscaping
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Flagstaff Area PracticesCity of Flagstaff
• Forest Stewardship required for new subdivisions and building permits in wildland-urban interface.
• Class A and B roofs required.• Fire resistive siding required in
wildland-urban interface.• Deck materials limited to wood
and Trex in wildland-urban interface. Boardwalk & Geodeck are being tested.
• FireWise plant material required in wildland-urban interface.
• Woodpile locations and deck storage addressed w/education.
Coconino County• Forest Stewardship required for
new subdivisions and building permits in wildland-urban interface.
• Class B roofs required.
• Other wildland-urban interface requirements under consideration in comprehensive plan amendments.
Fire Districts• Flagstaff Ranch similar to City.
• Other Districts may use a combination of requirements based on CCR’s.
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Other Considerations
• Homeowner responsibility is fundamental to community safety.
• Homeowner associations should consider CCR amendments.
• Insurance companies are changing their view of underwriting homes in wildland – urban interface.
• Economies of various materials vary.
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Summary
• FireWise development is affordable and attainable with existing technology.
• Educating the community is preferred over enforcement, but enforcement may be necessary.
• Human behaviors must be addressed (storage under decks, maintenance & woodpiles).
• Homeowner responsibility and accountability is key to community safety.
• The Flagstaff Fire Dept and others will help.• Call Flag Fire at 779-7688 or visit our website at
www.flagstaff.az.gov/fuelmanagement.
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Don’t Be This Guy
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