Which are considered lightweight roof types?

• A. Solid slab
• B. Concrete tile
• C. Lightweight Panelized (LWP)
• D. Metal deck

Answer: (C)

Lightweight roof types are built to minimize the roof’s mass, often using prefabricated panels that are quick to install and put less load on the structure. The standout in this list is Lightweight Panelized (LWP) because it refers to a system assembled from lightweight, pre-made panels, creating a roof that is much lighter than traditional mass roofing.

A solid slab is a heavy concrete roof, contributing a lot of dead load. Concrete tiles add substantial weight due to the ceramic material. A metal deck, while lighter than concrete, is still a deck system rather than a fully panelized lightweight roof, so it isn’t the distinct lightweight panelized type described here.