What is the characteristic of Type 3 construction?

Type 3 construction is characterized by being an "Ordinary" type of construction which typically includes a structural frame made of combustibles, such as wood or light materials, but is often combined with non-combustible exterior walls. The primary distinction here is the combination of wood framing for the structure and the use of materials that can resist fire on the outside, creating a moderate level of fire resistance and allowing for both commercial and residential applications.

In contrast, the other types mentioned in the options reflect other construction characteristics that do not apply to Type 3. Heavy timber framing, like in Type 4 construction, focuses on larger dimension lumber that is inherently fire-resistant due to its mass. Type 2 construction involves non-combustible materials but typically centers around steel and concrete without the combustible elements present in Type 3. The wood frame mentioned in the options often corresponds to Type 5 construction, which has a greater reliance on timber throughout without added fire resistance. By recognizing these distinctions, one can better understand the nature and guidelines that govern fire safety in different construction types.