ISO 1: Frame (combustible walls and/or roof)
Typically RMS Class 1
Wood frame walls, floors, and roof deck
Brick Veneer, wood/hardiplank siding, stucco cladding
Wood frame roof with wood decking and typical roof covers below
*Shingles
*Clay/concrete tiles
*BUR (built up roof with gravel or modified bitumen)
*Single-ply membrane
*Less Likely metal sheathing covering
*May be gable, hip, flat or combination of geometries
Roof anchorage
*Toe nailed
*Clips
*Single Wraps
*Double Wraps
Examples: Primarily Habitational, max 3-4 stories
ISO2: Joisted Masonry (JM) (noncombustible masonry walls with wood frame roof)
Typically RMS Class 2
Concrete block, masonry, or reinforced masonry load bearing exterior walls
*if reported as CB walls only, verify if wood frame (ISO 2) or steel/noncombustible frame roof (ISO 4)
*verify if wood frame walls (Frame ISO 1) or wood framing in roof only (JM ISO 2)
Stucco, brick veneer, painted CB, or EIFS exterior cladding
Floors in multi-story buildings are wood framed/wood deck or can be concrete on wood or steel deck.