Question

for a post - and - beam - framed structure, subfloors or roofs are commonly made of what material?
wood i - joists
particleboard
asbestos board
2\ nominal thickness lumber

Explanation:

In post - and - beam - framed structures, 2" nominal thickness lumber is a traditional and commonly used material for subfloors or roofs. Wood I - joists are more modern engineered products often used in different framing systems. Particleboard is not typically used for structural subfloors or roofs in this context. Asbestos board is a hazardous material and not used in modern construction for such applications.

Answer:

2" nominal thickness lumber