residential fire separation case study
DESCRIPTION
RESIDENTIAL FIRE SEPARATION CASE STUDY. BELMONT SUBDIVISION. Ashburn, Virginia. 1994. Belmont Fire Photos Courtesy Melvin Byrne Loudoun County Fire/Rescue Service. Leesburg. Ashburn. Sterling. 433. Single Family Dwellings. 425. 429. Townhomes Under Construction. - PowerPoint PPT PresentationTRANSCRIPT
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Belmont Fire PhotosBelmont Fire PhotosCourtesyCourtesy
Melvin ByrneMelvin Byrne
Loudoun County Loudoun County Fire/RescueFire/Rescue
ServiceService
Belmont Fire PhotosBelmont Fire PhotosCourtesyCourtesy
Melvin ByrneMelvin Byrne
Loudoun County Loudoun County Fire/RescueFire/Rescue
ServiceService
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Leesburg
Sterling
Ashburn
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Not To ScaleNot To Scale
425 429
TownhomesTownhomesUnder ConstructionUnder Construction
Single Family DwellingsSingle Family Dwellings
433
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425 429
Fire Origin
Single Family DwellingsSingle Family Dwellings
433
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425 429
DestroyedDestroyed
Single Family DwellingsSingle Family Dwellings
433
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425 429
Substantially DamagedSubstantially Damaged
Single Family DwellingsSingle Family Dwellings
433
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425 429
Minor Damage toMinor Damage toTownhousesTownhouses
Single Family DwellingsSingle Family Dwellings
433
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House of Fire Origin
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Primary Exposure
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Secondary Exposure
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Townhouses
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Fire Separation Distance< 8 Feet6 Feet
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CAUSE OF FIRECAUSE OF FIRELinked
to Drywall Curing
Operation in 433
Linked
to Drywall Curing
Operation in 433
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CONTRIBUTING CONTRIBUTING FACTORS:FACTORS:
Propane StoragePropane Storage Propane StoragePropane Storage
Fire SeparationFire Separation Fire SeparationFire Separation
Cedar ShakesCedar Shakes Cedar ShakesCedar Shakes
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Separation RequirementsSeparation Requirements
• 3 Feet From Lot Line
or
• One Hour Wall
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8 FEET8 FEET
WEAK LINK HOUSEWEAK LINK HOUSE
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ZONING AMENDMENT
• 0 Feet Side Yard
• 10 Feet Combined
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10 Feet Separation
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FIRE ORIGINFIRE ORIGIN
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NFPA 80A
Recommended practice for fire protection of
buildings from exterior fire exposures
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NFPA 80A
Provides an objective approach for the
designer to determine and mitigate fire risk
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Fire Risk Determined By:
• Building Construction
• Opening Protectives
• Building Size
• Building Construction
• Opening Protectives
• Building Size
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Fire Risk Mitigation
• Distance Between Buildings
• Residential Fire Sprinklers
• Fire Resistive Construction
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Application Example
SD #99-00366
Roseberry Section 1
Lots 12 & 13
SD #99-00366
Roseberry Section 1
Lots 12 & 13
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Exposure Analysis
• Width of Building - 48 ft
• Height of Building - 30 ft
• Fire Severity - Light
• Percent of Openings - 100%
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Exposure Analysis Table Calculation
• 48 ft / 30 ft = 1.6
• Guide number is 1.74
• Separation Distance =(1.74 x 30 ft) + 5 ft = 57 ft
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Means of Protection
• Spatial Separation - Table 2-3
• Construction Improvements
• Residential Fire Sprinklers
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< 8 Feet6 Feet
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