sheathing
Something that wraps around or surrounds something, as a sheath encases its blade.
Example
“When the sheathing was on it suddenly looked like a real house: you could see where the outer walls would be even if they still needed the siding and trim added.”
Where this comes from
This definition is adapted from “sheathing” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.