Which construction type is described as interior structural members being solid or laminated wood of large dimension with no concealed spaces?

Which construction type is described as interior structural members being solid or laminated wood of large dimension with no concealed spaces?

• A. Type III
• B. Type IV
• C. Type II
• D. Type I

Answer: (B)

Interior structural members made from large-dimension solid or laminated wood with no concealed spaces describe heavy timber construction, known as Type IV. The large, exposed wood members are purposefully left visible, and there aren’t hidden voids where fire can lurk or spread. This design relies on the mass of the wood to resist fire for a longer period, which is the hallmark of Type IV. Other construction types use noncombustible materials or include concealed spaces, which do not fit the description.

Interior structural members made from large-dimension solid or laminated wood with no concealed spaces describe heavy timber construction, known as Type IV. The large, exposed wood members are purposefully left visible, and there aren’t hidden voids where fire can lurk or spread. This design relies on the mass of the wood to resist fire for a longer period, which is the hallmark of Type IV. Other construction types use noncombustible materials or include concealed spaces, which do not fit the description.