WAC 51-19-670 Roof coverings. Regardless of occupancy group, roof covering materials not less than Class C shall be permitted where a fire retardant roof covering is required. Nonrated materials may be acceptable only where approved by the building official.

TABLE NO. VI-1

HEIGHTS AND AREAS

HAZARD CATEGORIES AND CLASSIFICATIONS

Relative Hazard		Occupancy Classification*
1		A-1, H, I-3 (highest hazard group)
2		A-2, A-2.1, I-1, I-2
3		A-3, A-4, B, E, R-1
4		R-3, M (lowest hazard group)

*See Table 5-A of the Building Code.

TABLE NO. VI-2

LIFE SAFETY AND EXITS

HAZARD CATEGORIES AND CLASSIFICATIONS

Relative Hazard		Occupancy Classification*
1		A-1, A-2, A-2.1, E, I, H-1, H-2, H-3 and H-7 (highest hazard group)
2		A-3
3		R-1, R-3, B-2 dining and drinking establishments
4		B-2 all others, B-4, H other than H-1, H-2, H-3 and H-7
5		B-1, B-3
6		M (lowest hazard group)

*See Table 5-A of the Building Code.

TABLE NO. VI-3

OCCUPANCY SEPARATIONS

HAZARD CATEGORIES AND CLASSIFICATIONS

Relative Hazard		Occupancy Classification*
1		B-1, H, I (highest hazard group)
2		A, B-2, B-3, B-4
3		E
4		R-1, M
5		R-3 (lowest hazard group)

*See Table 5-A of the Building Code.

TABLE NO. VI-4

EXPOSURE OF EXTERIOR WALLS

AND STAIRWAY ENCLOSURES

HAZARD CATEGORIES AND CLASSIFICATIONS

Relative Hazard		Occupancy Classification*
1		H (highest hazard group)
2		B-2 mercantile and warehouses
3		A, E, I
4		B-1, B-2 all others, R
5		B-4, M (lowest hazard group)

*See Table 5-A of the Building Code.

TABLE NO. V1-5

EARTHQUAKE SAFETY

HAZARD CATEGORIES AND CLASSIFICATIONS

Relative Hazard		Occupancy Classification*
1		A, E, I (highest hazard group)
2		R-1
3		B-3, B-4, H
4		B-1, B-2
5		R-3, M (lowest hazard group)

*See Table 5-A of the Building Code.

[Statutory Authority: RCW 19.27.120 and 19.27.074. 91-01-103, § 51-19-670, filed 12/18/90, effective 7/1/91.]