Retro-fits to Reduce Structural Ignitability chimney top to foundation (top-down) order of...
Transcript of Retro-fits to Reduce Structural Ignitability chimney top to foundation (top-down) order of...
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Retro-fits to Reduce Structural
Ignitability(or how to harden a home for less than $500.)
Presented by
Keith Worley, Forester
Forestree Development, LLC
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Working toward Stand Alone
homes The highest category of property triage
(assessment) that allows for:
◦ Fire fighter Safety
◦ Good Access and Escape
◦ Minimal expenditure of fire fighting resources
to protect structures.
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What if you are not home?
Will your home survive?
Will your family and pets be safe?
How about your personal effects and
cherished items?
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Why should a home be able to
Stand Alone? Fire can happen at any time and any place.
Weather and fire behavior are unpredictable and may prohibit control by local fire resources.
It may buy you the time needed to get resources in place.
You have more assurance your home may survive when you are gone.
Evacuating is an easier choice knowing your home has an increased chance of survival.
It makes the fire fighter’s tools more effective.
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Understanding Embers
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Embers in the Lab
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The Blank Canvas
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Typical Landscape
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Or just more fuel?
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Photo by Keith Worley
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Home and Structure = Fuel
Fire Triangle:◦ Fuel
◦ Heat
◦ Oxygen
Fire Behavior
Triangle:◦ Fuel
◦ Weather
◦ Topography
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WUI Homeowner Triangle
Vegetation
Fuels
Structural
Fuels
Maintenance of Both
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How do you build a campfire?
Tinder
Kindling
Small Sticks
Once it’s going, we add larger wood
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How does an ember ignite a home?
Tinder
Kindling
Small Sticks
Once it’s going, we add a house.
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Some truisms:
It takes tinder and/or kindling to start a
fire with just a spark (ember).
If debris (tinder/kindling) can get in, so
can an ember.
Fire burns faster on a vertical surface.
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Managing Tinder and Kindling
1 hour fuels (< ¼”)
10n hour fuels (< 1”)
100 hour fuels (< 3”)
1,000 hour fuels (> 3”)
Which of the above can be easily ignited
by a spark or ember?
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Building Materials Testing
Photo by IBHS
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Five Categories
Non-combustible
Class A
Class B
Class C
Unrated
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The Myth of Non-combustible
Even the best material, if not properly
installed, will lose its effectiveness.
Example:
◦ Concrete tile roof with many openings that
allow 1-hour fuels and embers to circumvent
the tiles.
◦ Stucco with openings and edges.
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Sloppy Installation
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Bird nest = tinder!
Photo by Keith Worley
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Rated Assemblies
Even Cedar Shakes can be installed to
have an A rating when installed as a fire
resistant assembly.
Manufacturer’s rating may include other
elements such as:
◦ Under-layments
◦ Fire stops
◦ Sealants
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Conducting a Structural Assessment
Learn a system that helps you cover all
parts of the structure.
A chimney top to foundation (top-down)
order of assessment is my preferred
method.
Cover all edges.
Look at all horizontal/vertical interfaces.
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The Roof
Roofing material
Flashings
Skylights
Vents
Chimney elements
Complex elements
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The Roof
Class A Roofing material which includes:
◦ Asphalt/fiberglass composition materials
◦ Metal or metal composites
◦ Concrete/clay tile
Roof clear of all debris/needles along with
cleaned gutters
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Complex and Simple Roofs
Through-
roof vent
Dormer
Re-entrant
corner
Ridge vent
Detail from IBHS at www.disastersafety.org
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Installation Critical
Photos from IBHS and IAFC
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Photo by Keith Worley
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Numerous Ignition Points
Photo by IBHS
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Photo by Keith Worley
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Photo by Keith Worley
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Watch for
Gaps
Debris traps
Siding that comes down to the roofing
materials
Flashings (or lack of)
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Gaps sealed
Photo by IBHS
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Missing bird stops
Photo by IBHS
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Gutters
Photo by IBHS
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Photo by IBHS
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Photo by IBHS
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Are Gutter Covers the answer?
“Gutter Helmet” type covers can work
well.
Other issues may arise, such as ice
damming.
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Gutter Screens Pro/Con
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Install Flashing to harden the
interface between the gutter and
the roofing material.
IBHS Test Burn
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Eaves- Open and Boxed
Photos by IBHS
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Eave and SoffetVents
1/8th or smaller opening size.
Think like a wasp. If they can get in, then
debris and embers can get in.
Older construction may not have
screening, or may have larger opening
sizes.
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Gutter and foundation Vents
Detail by CSFS
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Windows
Double pane minimum.
Reinforced frames for vinyl windows.
Best protection is good vegetation
clearances.
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Glass Shattered by Heat
Photo by Keith Worley
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Flames through the casement
IBHS Test Burn
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Photo by Keith Worley
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Heat Warped Frame. Glass
dropped 3 inches from frame.
Photo by Keith Worley
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Siding
Wood
Composites
Cement board
Stucco
◦ Real?
◦ Foam backed?
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Important Considerations
Clearances to heavy fuels
Horizontal/Vertical edges
Gaps at joints
Vents for dryers, furnace air, interior fans,
etc.
Exterior lighting, electrical outlets
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Are all penetrations screened?
Photo by Keith Worley
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Fire entry point at panel seam
Photo by Keith Worley
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Foundation Edge
Have a non-combustible material below
the siding edge.
Maintain 6 inches of clearance.
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Good Clearance
Photo by Keith Worley
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Not so good clearance
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Lookin’ Good?
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The weak spot!
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Debris in, ember in, equals fire
behind the 100 hour fuel.
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Decks
Often the most vulnerable building
element.
Use rated materials.
Protect Horizontal/Vertical edges.
Flammables on the deck.
Flammables under the deck.
Vegetation clearances are
critical!
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Photo by Keith Worley
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Photo by Keith Worley
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Rated vs. Unrated Decking
Photo by IBHS
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Are there enough 1-hour and 10-
hour fuels to ignite this 1,000-hour
fuel?
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Firewise Strategies: Keep flames from
touching the house and attachments
Create a ‘fuel free’
area around your
house that runs one
yard out on all sides.
When preparing your
home ignition zone,
start with the house
and work out
Photo by Firewise
Communities USA
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Firewise Strategies: Maintain a
clean landscape
A clean, healthy garden is not a receptive surface for embers
Keep plant debris to a minimum…
◦ Rake
◦ Mow
◦ Dispose of debris
promptly
Photo by IBHS
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Under The Deck????
Photo by Keith Worley
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IMPORTANT!!
This is the area where firebrands may
accumulate after the flame front has
passed.
If combustibles are pre-heated, an ignition
source can ignite the house or deck.
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Where leaves collect, firebrands will
collect.
Photo by Keith Worley
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Photo by Keith Worley
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Photo by Keith Worley
Metal flashing installed at
Horizontal/Vertical edge and painted
to match siding.
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What is our fuel arrangement here?
Photo by Keith Worley
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Firewise Strategies: Keep flames from
touching the house and attachments
Wood fences and mulch should not touch structures
Keep mulch and pine needles away from house, fence and
deck
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Firewise Retro-fits
Identify any openings.
Debris collection points.
Where will embers accumulate?
◦ Check where leaves or snow accumulate after
a windy day or blizzard. These may be the
same spots where embers collect.
Vegetation Clearances?
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Cost Factors Affect Time Factors
Inexpensive fixes can be done quickly and
easily.
Moderate cost items may be targeted for
fixes within 1-2 years.
Expensive measures, such as a roof
change, may require 2-5 years for fixes.
How do you eat an elephant?
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Focus on the doable
Caulking
Screening
Filling of voids
Use flashing to harden horizontal/vertical
edges on the structure.
Pulling back combustible mulches
Installing rock or gravel at
horizontal/vertical interfaces
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Think of other benefits
Weatherization
◦ Keep warm in, or embers out.
Varmint Proofing
◦ Keep bugs, bees, wasps, mice out
Firewization- A new word for us in the
WUI.
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Maintenance
Situational Awareness:
◦ Fire Season
◦ Red Flag Days
◦ Extended absences from home
Checklist for:
◦ Daily
◦ Weekly
◦ Monthly
◦ Yearly
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Assuming your home is already well
maintained, you will need the
following:
Caulk gun and caulk◦ Touch-up paint
Wire mesh (< 1/8th Inch mesh)
Tin snips
Metal flashing (roofing section at hardware store)
Shovel (for improving siding/ground clearances.
Stone to replace combustible mulch
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Cautions:
Use rock < 1 to 1 ½ “ in diameter
◦ Larger rock will trap debris!
Provide positive drainage away from the
foundation
◦ To avoid water ponding at foundation!
Do not trap moisture in wood
◦ Moisture + Wood = Rot!
Consult with a construction specialist if
unsure.
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Firewise is:
Keeping up with maintenance on a regular
basis.
Incorporating Firewise practices into how
we live and where we live.
Not a one-time deal. Firewise is forever if
we want to live in a wildfire prone
environment.
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“Nature….. She pardons no
mistakes.”
Ralph Waldo Emerson
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Bitterroot Fire, August 6, 2000, John McColgan