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

Leesburg

Sterling

Ashburn

Not To ScaleNot To Scale

425 429

TownhomesTownhomesUnder ConstructionUnder Construction

Single Family DwellingsSingle Family Dwellings

433

425 429

Fire Origin

Single Family DwellingsSingle Family Dwellings

433

425 429

DestroyedDestroyed

Single Family DwellingsSingle Family Dwellings

433

425 429

Substantially DamagedSubstantially Damaged

Single Family DwellingsSingle Family Dwellings

433

425 429

Minor Damage toMinor Damage toTownhousesTownhouses

Single Family DwellingsSingle Family Dwellings

433

House of Fire Origin

Primary Exposure

Secondary Exposure

Townhouses

Fire Separation Distance< 8 Feet6 Feet

CAUSE OF FIRECAUSE OF FIRELinked

to Drywall Curing

Operation in 433

Linked

to Drywall Curing

Operation in 433

CONTRIBUTING CONTRIBUTING FACTORS:FACTORS:

Propane StoragePropane Storage Propane StoragePropane Storage

Fire SeparationFire Separation Fire SeparationFire Separation

Cedar ShakesCedar Shakes Cedar ShakesCedar Shakes

Separation RequirementsSeparation Requirements

• 3 Feet From Lot Line

or

• One Hour Wall

8 FEET8 FEET

WEAK LINK HOUSEWEAK LINK HOUSE

ZONING AMENDMENT

• 0 Feet Side Yard

• 10 Feet Combined

10 Feet Separation

FIRE ORIGINFIRE ORIGIN

NFPA 80A

Recommended practice for fire protection of

buildings from exterior fire exposures

NFPA 80A

Provides an objective approach for the

designer to determine and mitigate fire risk

Fire Risk Determined By:

• Building Construction

• Opening Protectives

• Building Size

• Building Construction

• Opening Protectives

• Building Size

Fire Risk Mitigation

• Distance Between Buildings

• Residential Fire Sprinklers

• Fire Resistive Construction

Application Example

SD #99-00366

Roseberry Section 1

Lots 12 & 13

SD #99-00366

Roseberry Section 1

Lots 12 & 13

Exposure Analysis

• Width of Building - 48 ft

• Height of Building - 30 ft

• Fire Severity - Light

• Percent of Openings - 100%

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

Means of Protection

• Spatial Separation - Table 2-3

• Construction Improvements

• Residential Fire Sprinklers

< 8 Feet6 Feet