What are the three classifications of the exterior walls of Type II buildings?

What are the three classifications of the exterior walls of Type II buildings?

• A. Unreinforced masonry; reinforced masonry; tilt up
• B. Wood frame; brick veneer; glass curtain wall
• C. Concrete block; stucco; metal siding
• D. Steel framing; timber framing; masonry curtain

Answer: (A)

Type II buildings are noncombustible, so their exterior walls are typically built in three common forms. One form is unreinforced masonry walls, using bricks or blocks without steel reinforcement. They carry their own weight but have limited tensile strength and can perform differently under seismic or wind loads. The second form is reinforced masonry walls, where steel reinforcement and grout are embedded in the masonry to boost strength and durability. The third form is tilt-up walls, which are large concrete panels cast on site and raised into place to become the exterior facade; they offer strong, continuous noncombustible enclosure and fast construction. The other options mix materials or system types that aren’t the standard exterior-wall classifications for Type II construction. Wood-frame is combustible, brick veneer is typically a decorative veneer over another structural system, and curtain walls or metal siding describe finishes or cladding rather than the primary exterior-wall construction method used for Type II.

Type II buildings are noncombustible, so their exterior walls are typically built in three common forms. One form is unreinforced masonry walls, using bricks or blocks without steel reinforcement. They carry their own weight but have limited tensile strength and can perform differently under seismic or wind loads. The second form is reinforced masonry walls, where steel reinforcement and grout are embedded in the masonry to boost strength and durability. The third form is tilt-up walls, which are large concrete panels cast on site and raised into place to become the exterior facade; they offer strong, continuous noncombustible enclosure and fast construction.

The other options mix materials or system types that aren’t the standard exterior-wall classifications for Type II construction. Wood-frame is combustible, brick veneer is typically a decorative veneer over another structural system, and curtain walls or metal siding describe finishes or cladding rather than the primary exterior-wall construction method used for Type II.