Which type of construction does not require supporting construction to have a fire-resistance rating?

In the context of building construction types, Type IIB, IIIB, and VB all fall under the category of non-combustible or limited-combustible materials, but they differ in terms of the fire-resistance ratings they require for supporting structures.

Type IIB construction is comprised of non-combustible materials but does not require a fire-resistance rating for its structural elements. This allows for more flexibility in design and potentially lower construction costs, as the absence of fire-resistance requirements can simplify the construction process.

Type IIIB construction allows for some combustible materials, typically in the interior finishing, but still does not mandate a fire-resistance rating for supporting construction. This again provides design flexibility while still upholding safety standards.

Type VB construction is the most flexible and least restrictive, allowing for combustible materials throughout. It does not require fire-resistance-rated construction for supporting members, reinforcing the approach to allow for more economical and straightforward building methods without compromising fire safety through the use of other protective measures.

Thus, all of these types of construction share the characteristic of not requiring fire-resistance-rated supporting construction, making the selected option appropriate within the scope of building safety and compliance codes.