What is the difference between type iia and iib construction?

Type IIA has a minimum fire resistance of 1 hour at all times. Type IIB, although non-combustible, has no fire resistance requirements, unless required by other sections of the code.

Construction

types IIA and IIB are also not combustible, but they have little or no fire resistance. What is the difference between type IIA construction and type IIB construction? Construction types IIA and IIB are also not combustible, but they have little or no fire resistance.

Type III allows a mixture of combustible and non-combustible materials, while construction types IV and V can have combustible construction materials. The easiest way to define a Type II building is that it has the same structural characteristics as a Type I, since it is a non-combustible construction. TYPE II-B: Unprotected non-combustible (the most common type of non-combustible construction used in commercial buildings). It is a type of construction where the outer walls are made of non-combustible material and the interior elements of the building are made of solid or laminated wood with no hidden spaces.

Type IV construction is a type of construction in which the outer walls are made of non-combustible materials and the interior elements of the building are solid wood, laminated wood, heavy wood (HT) or structural composite wood (SCL) with no hidden spaces.