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Construction Type Definitions

IA Fire resistance rated non-combustible construction.
IB Fire resistance rated non-combustible construction.
IIA One-hour fire-resistance-rated non-combustible construction.
IIB Non-rated non-combustible construction.
IIIA One-hour fire-resistance-rated combustible construction with non combustible exterior walls.
IIIB Non-rated combustible construction with non-combustible exterior walls.
IV Heavy timber construction.
VA One-hour fire-resistance-rated combustible construction.
VB Non-rated combustible construction.

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