roofing
n.the material used to cover the top of a building. It also means the work of building or fixing a roof.
n.the material used to construct the external covering of a building; also refers to the trade or process of installing such materials.
“The workers are installing new metal roofing today.”
“After the heavy storm, the family had to replace the damaged roofing to prevent leaks in the attic.”
“The architect specified slate roofing for the project, citing its exceptional durability and aesthetic compatibility with the historic neighborhood's existing structures.”
Uncountable when referring to the material or the industry; rarely used in the plural.
From roof + -ing (“material, collection”).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.