Belmont Fire Photos
Courtesy
Melvin Byrne
Loudoun County
Fire/Rescue
Service
Leesburg
Sterling
Single Family Dwellings
425 429 433
Townhomes
Under Construction
Not To Scale
Single Family Dwellings
425 429 433
Fire Origin
Single Family Dwellings
425 429 433
Destroyed
Single Family Dwellings
425 429 433
Substantially Damaged
Single Family Dwellings
425 429 433
Minor Damage to
Townhouses
House of Fire Origin
Primary Exposure
Secondary Exposure
Townhouses
Fire 6 Feet < 8 Feet
Separation Distance
CAUSE OF FIRE
Linked
to Drywall Curing
Operation in 433
Propane Storage
CONTRIBUTING
Fire Separation
FACTORS:
Cedar Shakes
Separation Requirements
• 3 Feet From Lot Line
or
• One Hour Wall
WEAK LINK HOUSE
8 FEET
ZONING AMENDMENT
• 0 Feet Side Yard
• 10 Feet Combined
10 Feet Separation
FIRE 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
Fire Risk Mitigation
• Distance Between Buildings
• Fire Resistive Construction
• Residential Fire Sprinklers
Application Example
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
6 Feet < 8 Feet