| PROPERTY RISKS |
THE INTERNATIONAL STANDARDS ORGANIZATION (ISO) has established six basic
classification codes for building construction types depending on how susceptible
the structure is to fire damages.
TWO SUB- CLASSES
1) Ordinary Construction- Load-bearing exterior walls with min one (1) hr fire and
floors and roof are combustible
2) Heavy Timber- 2 hr min fire rating on load-bearing walls, wood columns at
least 8inches thick all sides, wood beams supports and ties at least 6 inches
wide or ten inches deep, floors having tongue and groove planks 3 inches thick
with one inch overlay and roof decks at least two inches thick
classification codes for building construction types depending on how susceptible
the structure is to fire damages.
- ISO CLASS 1 - Frame. Load-bearing components are constructed of wood or other
combustible components or any structure that can not otherwise be
- ISO CLASS 2 - Jointed Masonry. Exterior walls constructed of brick, adobe,
concrete,gypsum block, stone, tile or similar materials with a combustible floor or roof.
TWO SUB- CLASSES
1) Ordinary Construction- Load-bearing exterior walls with min one (1) hr fire and
floors and roof are combustible
2) Heavy Timber- 2 hr min fire rating on load-bearing walls, wood columns at
least 8inches thick all sides, wood beams supports and ties at least 6 inches
wide or ten inches deep, floors having tongue and groove planks 3 inches thick
with one inch overlay and roof decks at least two inches thick
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