Originally posted by Riger82:

Originally posted by Grandaddypurple:

You can repair it at a workbench, on the hammer icon. The workbench has to be sheltered to interact with it

Define sheltered.
The workbench is on the ground, but is surrounded by walls and a ceiling. Enough so that when I'm inside I get the buffs.

Just like that. That's what he means by sheltered; roofed and walled.